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How to Improve Ceramic Green Strength: Binder Selection & Formulation Tips


Time:

2026-05-26

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Application Guide  ·  Ceramic Body Strength

Step-by-step diagnostic guide for ceramic engineers: identify the root cause of low green strength, understand inorganic vs. organic binder mechanisms, run a 5-point dosage curve, and validate safely through pilot production.

📅 Last Reviewed: May 2026 📋 Goway Ceramic Materials Technical Team 📖 Application Guide — Binder Engineering ⚠ All data: Typical values — confirm by lab trial
Quick Answer Green strength of ceramic bodies is improved by selecting the right binder type and optimising dosage based on your body formula. Inorganic mineral binders form silicate bridges suited to standard wet-process tile bodies. Organic polymeric binders deliver higher strength via polymer chain bridging and suit lean or dry-press bodies. Typical starting dosage: 0.5–2.0% (inorganic) or 0.3–1.0% (organic). Results depend on clay mineral content, particle size distribution, and process conditions. Lab trial is essential before full-scale scale-up. See the Binder Selection Matrix for product-grade-specific recommendations.

Key Facts for Ceramic Manufacturers

Inorganic Binder Dosage Range
0.5 – 2.0%
ZG-302 / ZG-303 by dry body weight. Typical starting point: 0.5%. Increase in 0.3% increments.
Organic Binder Active Ingredient
95 – 98%
FG-ZM01A active ingredient content (Source: Goway Technical Data Sheet). FG-ZM01D: 90–95%.
Organic Binder L.O.I
50 – 55%
Both FG-ZM01A and FG-ZM01D. Requires controlled debinding hold during firing for thick bodies.
Inorganic Binder SiO₂ (ZG-303)
65 – 70%
SiO₂ content of ZG-303 (Source: Goway Technical Data Sheet). Contributes to body silica balance after firing.
Key Test Indicator
MOR (MPa)
Dry flexural strength (Modulus of Rupture) via three-point bend test on dried green bars. Target: depends on body type and press pressure.
Critical Firing Risk (Organic)
Black Core
Organic binder burn-out may cause dark core defect in fast-fired or thick bodies. Always validate the firing curve in a pilot kiln trial first.
Related Products
ZG / FG-ZM01

Step 1 — Measure and Diagnose Before Selecting a Solution

Effective green strength improvement starts with measurement, not product selection. Before evaluating any binder, establish a baseline and locate where in the production process breakage occurs.

How to Measure Current Green Strength

The standard method is the three-point flexural test (Modulus of Rupture, MOR) on dry-pressed and dried green bar samples of standardised dimensions. Run a minimum of 10 bars per test condition and record mean ± standard deviation in MPa.

F (Applied Force) Support A Support B Span (L) — typically 80–100 mm for standard test bar THREE-POINT BENDING TEST — CERAMIC GREEN BODY MOR MOR (MPa) = 3FL / 2bd² where b = width, d = thickness of test bar

Fig. 1 — Schematic of three-point bending test for green ceramic body (MOR). Standard equipment: ceramic lab press bar die + universal testing machine or dedicated flexural tester. (Source: Goway in-house testing protocol)

Additional practical indicators include:

  • Edge chip / corner-drop test — drop a green tile from a standardised height onto a hard surface; count corner and edge survival rate
  • Breakage audit by stage — record breakage rate separately at: after pressing, after drying, after transfer/cutting, after stacking
  • Dimensional stability — measure length, width and thickness before and after drying to detect warping or uneven shrinkage
Three-point flexural MOR test equipment measuring ceramic green strength of a pressed bar sample in a ceramic laboratory
Fig. 5 — Three-point flexural MOR (Modulus of Rupture) test equipment in use at the Goway Ceramic Materials Lab, measuring dry green strength on a standard pressed ceramic body bar. Standardised bar dimensions and consistent drying protocol are essential for comparable results across different binder dosage levels. (Source: Goway in-house lab, Foshan)

Root Cause Categories

Once you have measured where and how much breakage occurs, systematically evaluate the contributing factors before choosing a binder type or dosage:

Factor 01

Raw Material Plasticity

Low plasticity clays or high lean material ratios (feldspar, quartz, calcite) reduce particle-to-particle cohesion. Ball clay typically contributes more plasticity than standard kaolin. Reducing plastic clay for whiteness improvement often requires supplemental binder addition.

Factor 02

Particle Size Distribution

Coarse or mono-modal particle distribution creates large inter-particle voids and weak contact points. Poor particle packing reduces bonding sites per unit volume regardless of binder type. Review ball mill time and media size before increasing binder dosage.

Factor 03

Moisture & Density

Insufficient pressing moisture, uneven moisture distribution in spray-dried powder, or inconsistent bulk density leads to incomplete particle contact. Over-drying removes the free water film that supports capillary bonding before the binder network forms.

Factor 04

Pressing Parameters

Low compaction pressure, short dwell time, or press wear affecting die fill uniformity reduces green density and strength. Pressing improvements alone may not compensate for a fundamentally weak binder system.

Factor 05

Binder Type & Dosage

Mismatched binder type for the body composition, under-dosing, or binder degraded by hard process water are common chemical causes. Both the binding mechanism and the active ingredient content of the binder determine effectiveness.

Factor 06

Powder Aging Time

Insufficient aging (homogenisation time) of spray-dried powder in the silo before pressing leads to uneven moisture distribution and incomplete binder film formation. Typical minimum aging: 24–48 hours depending on body composition.

⚠ Common Misconception: "More binder always means more strength" Over-dosing binders — especially organic polymeric types — can reduce green strength above an optimal dosage point due to lubrication effects between particles, increase firing defect risk, raise cost, and negatively affect slurry viscosity stability. Always identify the optimal dosage by running a controlled dosage curve test. Never extrapolate from a single data point.
Dry edge cracking defect in a ceramic green body caused by insufficient binder dosage — visible chipping and fracture along the edge of a pressed tile before firing
Fig. 6 — Dry edge cracking and corner chipping on a pressed ceramic green body tile. This type of defect is a common consequence of insufficient green strength, particularly in lean body formulations or when the binder dosage is below the effective minimum. Edge breakage typically occurs during transfer from press to dryer or during automated stacking. Systematic MOR measurement and binder dosage optimisation can substantially reduce this defect. (Source: Goway in-house defect analysis)

Step 2 — Understand Binder Types & Working Mechanisms

Two fundamentally different binding mechanisms are available for ceramic body strengthening. Understanding the mechanism helps match the right product to the right production challenge before selecting a specific grade.

INORGANIC BINDER (ZG-302/ZG-303) Rigid silicate-aluminosilicate bridge Forms at contact points during drying ORGANIC BINDER (FG-ZM01A/FG-ZM01D) Flexible polymer chain bridge network Higher strength per dosage unit in lean bodies

Fig. 2 — Mechanism comparison: inorganic silicate network bridging (ZG series) vs. organic polymer chain bridging (FG-ZM01 series). Organic binders form a denser, more flexible network suited to low-clay or dry-press bodies. (Source: Goway in-house engineering evaluation)

Mechanism 1: Silicate Network Bridging (Inorganic)

Inorganic mineral binders contain reactive silica-alumina phases (SiO₂ 60–70%, Al₂O₃ 13–16%). During drying, these form thin aluminosilicate bridges at particle contact points, acting as a rigid network. The binder becomes part of the ceramic body after firing and contributes to the fired microstructure. Goway's ZG-302 and ZG-303 are examples of this category.

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Mechanism 2: Polymer Chain Bridging (Organic)

Organic polymeric binders use long-chain polymer molecules that physically bridge ceramic particles and form a flexible network after drying. With active ingredient content typically 90–98%, they can provide significantly higher green strength per dosage unit compared to inorganic types — particularly in lean or low-plasticity bodies. Goway's FG-ZM01A and FG-ZM01D grades are examples of this category.

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Mechanism 3: Clay Mineral Contribution

Plastic clays such as ball clay contribute intrinsic bonding through platelet-to-platelet electrostatic interaction. This natural binding is most effective when clay content is ≥15% in the body, and decreases significantly as lean material ratio increases. When reducing clay content for whiteness or shrinkage targets, supplemental binder addition becomes essential.

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Mechanism 4: Capillary Bonding (Transient)

Water films at particle contacts create surface tension forces contributing to immediate green strength after pressing. This is moisture-dependent and transient — it dissipates as drying proceeds. Capillary bonding can mask insufficient binder dosage during initial handling but fails during drying or transport. Not a substitute for chemical binder systems.

Step 3 — Technical Comparison: Inorganic vs. Organic Ceramic Body Binder

Quick Selection: ZG-302/ZG-303 suit standard wet-process ceramic bodies where slurry compatibility and firing colour stability are priorities. FG-ZM01 series are preferred for lean bodies, dry-press systems, or situations where maximum green strength per dosage unit is required. A combination may be considered for complex formulations. All selection criteria should be validated by lab trial under your production conditions.
Table 1 — Inorganic vs. Organic Ceramic Body Binder: Key Parameter Comparison
Comparison Factor ZG-302 / ZG-303
(Inorganic / Mineral)
FG-ZM01A / FG-ZM01D
(Organic Polymeric)
Selection Notes
Primary mechanism Silicate-aluminosilicate network bridging at particle contacts Long-chain polymer bridge network between particles Both effective; mechanism determines compatibility with body type
Active ingredient level Mineral composition (SiO₂ 60–70%, Al₂O₃ 13–16%) (Source: Goway TDS) Active ingredient 90–98% (FG-ZM01A: 95–98%, FG-ZM01D: 90–95%) (Source: Goway TDS) Organic binder delivers more binding activity per gram of product
Green strength potential Moderate — typical for standard tile bodies with normal clay content Higher — especially effective in lean bodies, high-lean-material ratios Choose organic when green strength is the primary bottleneck
Dosage range (typical) 0.5–2.0% by dry body weight 0.3–1.0% by dry body weight Start at lower end; run dosage curve to identify optimum
Slurry compatibility Generally compatible with standard slurry systems; may slightly increase viscosity at high dosage Compatible with most slurry systems; monitor Ford Cup flow time when adding; may require deflocculant adjustment Test slurry viscosity after binder addition in pilot batch before full production
Firing behaviour (L.O.I) ZG-302: L.O.I 7–8%; ZG-303: L.O.I 6–7%. Contributes SiO₂/Al₂O₃ to fired body. Both FG-ZM01A and FG-ZM01D: L.O.I 50–55%. Burns out during firing. Organic: verify debinding at 300–500°C for thick bodies to avoid dark cores
Impact on fired colour/whiteness Fe₂O₃ 1–2% may slightly affect fired colour in whiteness-sensitive bodies (Source: Goway TDS) Organic content burns out; minor impact on fired colour at recommended dosage For maximum whiteness targets, evaluate fired sample with and without binder addition
Risk of black core defect Low under standard firing conditions Possible in fast firing or thick-body products — requires firing curve validation Organic binder: mandatory pilot kiln trial before scale-up
Best application scenario Standard wet-process tile body; bodies with ≥15% plastic clay content; cost-sensitive production Low-clay or lean bodies; dry-press systems; high-strength requirement; ultra-thin tile Lean bodies (clay <12%) may not achieve target strength with inorganic binder alone
Combination use ZG (base) + small FG-ZM01D addition for peak strength — technically feasible. Compatibility must be confirmed by lab trial. Cost-effective approach when intermediate strength level is the target

All values are typical and for evaluation reference only. Confirm with the latest batch COA before production use. (Source: Goway Technical Data Sheet)

✓ Normal Cross-Section Uniform colour throughout Complete organic burn-out (adequate debinding hold at 300–500°C) ✗ Black Core Defect Dark internal zone (fast firing / no debinding hold — organic binder residue trapped inside body)

Fig. 3 — Ceramic tile cross-section: normal (left) vs. black core defect (right). Black core occurs when organic binder burns incompletely due to fast firing or insufficient debinding hold temperature. Mandatory pilot kiln trial is required before scaling up with organic binders. (Source: Goway engineering evaluation)

Cross-section photograph of a fired ceramic tile showing a distinct black core defect — dark grey-to-black internal zone caused by incomplete organic binder burn-out during fast firing
Fig. 7 — Cross-section of a fired ceramic tile exhibiting a black core defect. The dark internal zone is caused by incomplete burn-out of organic polymeric binder during a fast-fire cycle without an adequate debinding hold at 300–500°C. The exterior appears normally fired, making this defect only detectable by destructive cross-section inspection. A pilot kiln trial with cross-section verification is mandatory before full production when using organic binders in thick-body or fast-fire processes. (Source: Goway in-house defect documentation)

Inorganic Binder Specifications — ZG-302 / ZG-303

Inorganic Mineral Ceramic Body Binder ZG-302 & ZG-303
Grade SiO₂ (%) Al₂O₃ (%) Fe₂O₃ (%) Na₂O (%) CaO (%) MgO (%) L.O.I (%)
ZG-302 60–65 13–15 1–2 1–2 1–2 2–3 7–8
ZG-303 65–70 14–16 1–2 1–2 1–2 2–3 6–7

Typical values. (Source: Goway Technical Data Sheet) Final specification: confirm with latest batch COA before purchase or production use.

→ View full ZG-302 / ZG-303 product page with dosage guide, packaging and COA request

Organic Polymeric Binder Specifications — FG-ZM01 Series

Organic Polymeric Ceramic Body Binder FG-ZM01A & FG-ZM01D
Grade Active Ingredient Inorganic Salt By-product Unreacted Monomer / Oligomer Residual Raw Materials & Moisture L.O.I (%)
FG-ZM01A 95–98% 3–8% <2% Trace 50–55
FG-ZM01D 90–95% 5–8% <2% Trace 50–55

Typical values. (Source: Goway Technical Data Sheet) FG-ZM01A has higher active ingredient content and is typically preferred when maximum green strength per dosage unit is required. Final specification: confirm with latest batch COA.

→ View full FG-ZM01A / FG-ZM01D product page with firing curve guidance, packaging and COA request

Product Appearance & Technical Documentation

Sample of Goway organic polymeric binder FG-ZM01D — white-to-off-white granular powder in a transparent sample bag for ceramic body green strength enhancement
Fig. 8 — FG-ZM01D organic polymeric ceramic body binder sample. Appearance: white to off-white granular powder. Active Ingredient: 90–95%. Packaged in 25 kg PE-lined woven bags or 500 kg flexible bulk bags. (Source: Goway product documentation)
Sample page excerpt from Goway ceramic binder Technical Data Sheet showing key specification parameters including active ingredient content, physical appearance, recommended dosage and storage conditions
Fig. 9 — Sample page from a Goway Ceramic Body Binder Technical Data Sheet (TDS), showing key specification parameters, recommended dosage range, and storage conditions. Complete TDS, COA (Certificate of Analysis) and SDS (Safety Data Sheet) documents are available on request for ZG-302, ZG-303, FG-ZM01A and FG-ZM01D. Always confirm with the latest batch COA before production use. (Source: Goway Technical Data Sheet)
📄 Document Downloads: Sample Technical Data Sheet (TDS) for the FG-ZM01 series is available for download at en.goway-china.com/products/organic-ceramic-body-binder.html. For ZG-302 / ZG-303 TDS, COA and SDS documents, visit en.goway-china.com/products/inorganic-ceramic-body-binder.html. For the latest batch-specific COA, please contact Goway directly with your purchase or evaluation requirements.

Binder Selection Matrix — Match Your Situation to a Starting Strategy

Use the table below to identify the most appropriate binder approach based on your production situation. All recommendations are starting points for lab evaluation — confirm by lab trial under your specific formula and process conditions.

Table 2 — Binder Selection Matrix: Your Situation → Recommended Strategy
Your Situation Recommended Approach Why Starting Dosage Validation Method Related Product
Standard wet-process tile body; clay content ≥15%; moderate green strength target Inorganic
ZG-302 or ZG-303
Mineral binder integrates into body matrix; cost-effective; low firing risk 0.5% by dry weight Dry MOR test + slurry viscosity check ZG-302 / ZG-303
Lean body with high quartz/feldspar content; clay <12%; green strength below target Organic
FG-ZM01A or FG-ZM01D
Polymer chain bridging compensates for low clay plasticity; higher strength per dosage unit 0.3% by dry weight Dry MOR + pilot kiln trial for firing curve FG-ZM01A
Dry-press body; no slurry process; maximum pressing strength required Organic
FG-ZM01A preferred
Higher active ingredient (95–98%) forms strong dry-state polymer network in pressed powder 0.3–0.5% by dry weight Dry MOR + edge chip resistance test FG-ZM01A
High breakage rate after drying but acceptable after pressing; drying step is the failure point Combo or Organic
FG-ZM01D or ZG + FG-ZM01D
Organic binder network persists after moisture loss; provides post-drying cohesion that inorganic alone may not maintain FG-ZM01D at 0.2–0.4% Dry MOR before and after drying cycle; track drying shrinkage FG-ZM01D
Ultra-thin tile or large-format body (≥900×900mm); edge and corner handling breakage Organic
FG-ZM01A
High active ingredient level required; polymer flexibility reduces crack initiation at edges under bending loads 0.4–0.6% by dry weight Full-sheet dry MOR + corner-drop survival rate; pilot kiln for firing validation FG-ZM01A
Cost-sensitive production; acceptable moderate green strength improvement; fired colour flexibility Inorganic
ZG-302
Lower active content per unit, but contributes usable mineral oxides to fired body; cost-effective base solution 0.8–1.5% by dry weight Dry MOR + fired colour check ZG-302
Existing green strength acceptable but slurry stability poor; looking for binder with minimal viscosity impact Inorganic
ZG-303
ZG-303 has higher SiO₂ content (65–70%) and lower L.O.I (6–7%); typically has lower viscosity impact than organic binders at equivalent dosage 0.5–1.0% by dry weight; monitor Ford Cup after addition Slurry Ford Cup flow time + viscosity + dry MOR ZG-303

Selection recommendations are for starting evaluation only. Results vary with body formula, water quality, processing conditions and kiln type. Lab trial is mandatory before production scale-up.

Recommended Dosage & Lab Trial Protocol

A systematic 5-point dosage curve is the most reliable method to identify the optimal binder type, dosage and combination for your specific body formula. Do not rely on a single-point trial or assume results from other formulas will transfer directly.

MOR Improvement vs. Dosage — Typical Response Curve

0 0.5 1.0 1.5 MOR — Dry Flexural Strength (MPa) 0 0.2% 0.4% 0.6% 0.8% 1.0% Organic Binder Dosage (% by dry body weight) Typical optimum zone Organic Binder (FG-ZM01A) Inorganic Binder (ZG-302) TYPICAL MOR IMPROVEMENT CURVE — BINDER DOSAGE RESPONSE

Fig. 4 — Typical MOR improvement curve with organic polymeric binder addition (FG-ZM01A, solid red) vs. inorganic binder (ZG-302, dashed green). Organic binder shows a steeper response and higher MOR ceiling; the inorganic binder delivers more gradual, consistent strength across a wider dosage range. Typical result only — actual values depend on body formula, clay content and press pressure. Confirm by lab trial. (Source: Goway in-house testing, 2025–2026)

Measured MOR Dosage Curve Data — Binder Type & Dosage Comparison

The following table presents typical measured dry flexural strength (MOR) values from a controlled dosage curve trial. Data is anonymised and typical — actual results depend on your specific body formula, clay content, pressing parameters and drying conditions.

Table 3 — Measured MOR Dosage Curve: FG-ZM01D Organic Binder vs. ZG-302 Inorganic Binder vs. Control
Binder Type Grade Dosage (%) Avg. MOR (MPa) Breakage Rate Reduction Notes
Control (None) 0.0 1.2 Baseline Standard body: clay 18%, feldspar 40%, quartz 42%. Pressed at 25 MPa. Dried at 110°C for 2 hours.
Organic Polymeric FG-ZM01D 0.4 1.8 ~25% Slight viscosity increase observed (Ford Cup +2s). MOR increase is noticeable but below optimal. Suitable when moderate improvement is sufficient.
Organic Polymeric FG-ZM01D 0.6 2.4 ~60% ★ Optimal balance: peak MOR gain vs. dosage cost. Slurry viscosity manageable at standard deflocculant level. Fired cross-section clean at standard firing curve.
Organic Polymeric FG-ZM01D 0.8 2.5 ~65% MOR plateau reached. Drying shrinkage increased by 0.3%. Risk of drying cracks at fast drying rates. Pilot kiln trial mandatory — check for black core in thick sections.
Inorganic Mineral ZG-302 0.8 1.4 ~10% Modest MOR gain. Minimal impact on slurry properties. L.O.I 7–8% contributes to fired body composition. Suitable when slurry stability is priority.
Inorganic Mineral ZG-302 1.5 2.1 ~40% Minimal viscosity impact on slurry. Fe₂O₃ 1–2% may slightly affect fired whiteness in white-body formulations. Verify fired colour at this dosage level.
Inorganic Mineral ZG-302 2.0 2.2 ~45% MOR gain marginal beyond 1.5%. Slurry viscosity increases slightly. Upper practical limit; check fired whiteness at this dosage.
📋 Test Conditions: Standard ceramic body formula (clay 18%, feldspar 40%, quartz 42%), pressed at 25 MPa, dried at 110°C for 2 hours, MOR measured via three-point bending test according to GB/T 3810 reference method. Sample size: n = 10 bars per test condition. Values are mean results. Typical results only — actual values depend on body formula, clay mineral composition, pressing pressure, drying profile, and particle size distribution. Lab trial under your specific production conditions is essential. (Source: Goway in-house testing, 2025–2026)

Key observations from the measured data:

  • FG-ZM01D at 0.6% delivers the highest MOR gain per dosage unit. Above 0.6%, the improvement plateaus while drying shrinkage and black core risk increase. 0.6% is the recommended starting point for most body formulations.
  • ZG-302 at 1.5% provides a useful MOR improvement with minimal slurry processing impact. This makes it a practical choice when slurry stability and fired colour consistency take priority over maximum green strength.
  • Dosages above the optimum do not produce proportional benefits. For FG-ZM01D, the MOR gain from 0.6% to 0.8% is only ~4% while drying defects risk increases measurably. Always identify the optimum through a controlled dosage curve, not through extrapolation.

5-Point Dosage Curve — Inorganic Binder (ZG-302 / ZG-303)

Run the following dosage series against your base formula (no added binder). Measure dry MOR and slurry viscosity at each point. Expected pattern: strength increases to an optimum then plateaus or decreases as dosage increases further.

 
0.5%
Baseline addition
 
0.8%
First increment
 
1.2%
Typical optimum zone
 
1.6%
Monitor viscosity
 
2.0%
Upper limit — check fired colour

Note: Bar heights are illustrative of a typical response curve. Actual results depend on body formula and clay mineral content. Typical result only — confirm by lab trial. (Source: Goway Technical Data Sheet)

5-Point Dosage Curve — Organic Binder (FG-ZM01A / FG-ZM01D)

 
0.2%
Baseline addition
 
0.4%
First increment
 
0.6%
Typical optimum zone
 
0.8%
Monitor slurry & firing
 
1.0%
Upper limit — firing trial mandatory

Typical result only. Organic binder: at each dosage point, a pilot kiln firing trial is required to verify no dark core or surface defects occur. Confirm by lab trial before production scale-up.

📊 Application Scenario — Anonymised Industry Example

A Southeast Asian floor tile plant was experiencing dry-edge breakage at a rate of approximately 4.8% at the exit of the drying kiln. After baseline MOR measurement and a systematic 3-point dosage trial with FG-ZM01D at 0.4%, 0.6%, and 0.8%, the breakage rate was reduced to approximately 1.6% at an optimal dosage of 0.6%. The 0.8% dosage was not adopted: while dry MOR remained acceptable, the pilot kiln cross-section showed early-stage dark core formation in 12mm thick bodies at the existing fast-fire cycle. The firing curve was adjusted with a 15-minute hold at 380°C, after which the 0.6% dosage was validated in full-scale production without further defects. Typical result only. Results vary with body formula and production conditions.

Measurement Parameters at Each Dosage Point

Test Parameter Method / Equipment Record & Target Relevance
Dry Flexural Strength (MOR) Three-point bend test on dry green bars (standard ceramic lab press bar) Record MPa at each dosage point; compare to baseline (no binder) Primary indicator of green strength improvement
Slurry Ford Cup Flow Time Ford Cup No. 4 Record seconds; compare to base slurry without binder addition Detects viscosity impact of binder addition on slurry process
Spray-Dried Powder Flowability Flow angle or bulk density test Record and compare; significant change may indicate binder-powder interaction issue Critical for dry-press consistency and die fill uniformity
Drying Shrinkage Dimensional measurement pre- and post-drying Record % dimensional change; unexpected increase may indicate binder effect on drying stress Alerts to potential warping or drying crack risk at high binder dosage
Fired Whiteness (1200°C) Whiteness meter on fired sample Record whiteness at each dosage; compare to unfired reference body Checks for colour impact from Fe₂O₃ (inorganic) or organic burn-out residues
Visual Inspection of Fired Sample Cross-section examination Check for dark core, surface blisters, or pinholes — critical for organic binder trials Identifies debinding issues requiring firing curve adjustment

Lab Trial Protocol — Step by Step

  1. Prepare reference body batch Mix your standard body formula without binder addition. Record baseline dry MOR, slurry Ford Cup flow time (if wet process), and powder flowability. This is your control data point.
  2. Prepare 5 test batches at dosage series For inorganic: 0.5%, 0.8%, 1.2%, 1.6%, 2.0%. For organic: 0.2%, 0.4%, 0.6%, 0.8%, 1.0%. Add binder to slurry or dry powder as per product TDS instruction. Maintain all other variables constant (water ratio, milling time, spray-drying temperature, press pressure).
  3. Press standard green bar samples Use identical die and pressing pressure for all batches. Minimum 10 bars per dosage point for statistical significance. Record press density and moisture.
  4. Dry and measure dry MOR Dry bars at standard drying curve (same for all). After cooling to room temperature, measure three-point flexural strength (MOR, MPa) for each bar. Record mean and standard deviation per dosage point.
  5. Fire pilot samples and inspect cross-sections Fire pressed tiles or bars at your standard kiln curve. For organic binder trials, add a debinding hold at 300–500°C if not already in your programme. After firing: measure whiteness, inspect cross-sections for dark core, record dimensional change (shrinkage). Document any surface defects.
  6. Plot dosage curves and identify optimum Plot dry MOR vs. dosage for each binder type tested. The optimum is typically the dosage just before MOR plateaus or begins to decrease. Cross-check against fired quality and viscosity data. Select the dosage that meets all targets simultaneously.
  7. Validate in pilot production batch Run a controlled pilot batch at the selected dosage and binder type. Monitor all process parameters (slurry, spray drying, pressing, drying, firing) over at least 3 production shifts. Track green breakage rate before and after binder introduction. Confirm stable performance before full-scale implementation.

Supplementary Formulation & Process Adjustments

Binder selection is one lever. The following non-binder adjustments can significantly improve green strength and should be considered in combination with binder optimisation:

  • Increase plasticity clay fraction: Replacing part of feldspar or quartz with high-plasticity ball clay can improve intrinsic body cohesion, reducing reliance on added binder.
  • Optimise particle size distribution: Achieving broader particle size distribution (bimodal or trimodal) improves packing density and inter-particle contact area. Review ball mill time and media size.
  • Control spray-dried powder moisture and aging: Target moisture within ±0.3% of the optimal pressing moisture for your body. Ensure minimum 24–48 hours aging in powder silo for even binder distribution before pressing.
  • Review pressing parameters: Optimise press pressure, dwell time and die fill uniformity. Worn dies or inconsistent fill reduce green density regardless of binder choice.
  • Manage drying rate: Excessive drying rate creates surface-to-centre moisture gradients and internal stress. Slow the initial drying phase (especially for thick-body or high-binder-dosage formulas) to allow binder network to form without cracking.
  • Consider plasticiser addition: For dry-press systems with very lean bodies, a small addition of plasticiser (PEG or glycerine type, per TDS recommendation) in combination with the organic binder can improve powder pressing behaviour and green density.

Troubleshooting Table — Green Strength & Binder System

Table 4 — Common Problems in Ceramic Green Strength & Binder Use
Problem Possible Cause Related Parameter Recommended Action Product / Guide Link
Dry MOR below target even at maximum binder dosage Clay content too low; particle size distribution too coarse; pressing pressure insufficient Clay% in formula; d50 / d90 of slurry; pressing pressure log Switch to organic binder (FG-ZM01A) or increase plasticity clay ratio; review milling protocol; consult press parameters FG-ZM01A →
Green strength acceptable after pressing but drops significantly during drying Capillary bonding loss during drying; inorganic binder network insufficient after moisture removal MOR at press vs. MOR after drying; drying curve rate Add organic binder (FG-ZM01D) or transition to FG-ZM01A; slow down initial drying phase; check powder aging time FG-ZM01D →
Organic binder addition significantly increases slurry viscosity High-molecular-weight polymer interaction with clay particles; binder dosage too high Ford Cup flow time before and after binder addition Reduce binder dosage; increase deflocculant addition slightly to compensate; add binder at later stage of slurry preparation; test FG-ZM01D (lower active ingredient) before FG-ZM01A Viscosity Guide →
Dark core (black core) defect in fired tiles after organic binder addition Insufficient debinding time in firing curve; fast firing rate through 300–500°C zone; thick-body product L.O.I 50–55% for FG-ZM01 series; kiln firing curve log Add debinding hold at 350–450°C in firing programme; reduce firing rate through this zone; confirm with pilot kiln trial before production scale-up; consider reducing organic binder dosage FG-ZM01A TDS →
Fired whiteness decreases after adding inorganic binder Fe₂O₃ content in ZG-302/ZG-303 (1–2%) contributing iron oxide colouration Fe₂O₃% in ZG product TDS; fired sample whiteness measurement Switch to organic binder for whiteness-critical bodies; or test at minimum effective inorganic binder dosage; evaluate fired whiteness at each dosage point in lab trial FG-ZM01 →
Green strength inconsistent batch-to-batch despite same dosage Inconsistent binder dispersion in slurry or powder; variable clay source moisture; inconsistent aging time Binder addition point in slurry/powder prep; powder aging log; clay moisture on receipt Fix binder addition timing in process SOP; standardise powder aging to 24–48 hrs; add incoming clay moisture check; verify binder mixing time is sufficient ZG-302/303 →
Edge and corner chip breakage during transfer after pressing Insufficient immediate green strength at edges; die wear causing incomplete fill at corners; low press pressure at edge zone Corner-drop test; die condition inspection; pressing pressure map Switch to FG-ZM01A for higher active ingredient per dosage; inspect and replace worn die corners; review conveyor belt and transfer equipment for sharp impact points FG-ZM01A →
Drying cracks appearing at binder dosage above 1.0% (organic) High binder dosage alters shrinkage behaviour; binder film creates uneven surface tension during drying Drying shrinkage measurement; drying curve rate Reduce organic binder dosage to below 1.0%; slow initial drying rate; check if combination with inorganic binder at lower respective dosages achieves target strength without drying issues ZG-302/303 →
Spray-dried powder sticking or poor flowability after organic binder addition Binder surface tackiness in spray-dried granules; spray-dry outlet temperature too low; excessive binder dosage Powder bulk density; flow angle; spray-dry outlet temperature log Increase spray-dry outlet temperature slightly; reduce binder dosage; trial FG-ZM01D (lower active content) which may produce less tacky granules; review inlet/outlet temperature profile FG-ZM01D →

Frequently Asked Questions

Q1: What causes low green strength in ceramic bodies?
Low green strength is typically caused by insufficient or mismatched binder type, low plasticity clay mineral content (especially when reducing ball clay for whiteness), coarse particle size distribution, low or uneven moisture distribution in spray-dried powder, inadequate pressing pressure, or under-aging of the powder before pressing. Each factor reduces the particle-to-particle bonding force in the unfired body. Identifying the dominant factor before selecting a binder solution is the most efficient approach.
Q2: What is the difference between inorganic and organic ceramic body binders?
Inorganic mineral binders (ZG-302 / ZG-303) work by forming silicate-aluminosilicate bridges between ceramic particles. They contribute their oxide composition to the fired body and have moderate L.O.I (6–8%). They are compatible with standard wet-process tile bodies. Organic polymeric binders (FG-ZM01A, Active Ingredient 95–98%; FG-ZM01D, Active Ingredient 90–95%) use polymer chain bridging for higher green strength per dosage unit, burn out during firing (L.O.I 50–55%), and require firing curve validation in thick-body or fast-fire products to avoid dark core defects. (Source: Goway Technical Data Sheet)
Q3: How much ceramic body binder should I add?
Typical starting dosage for inorganic binders (ZG-302/ZG-303) is 0.5–2.0% by dry body weight. For organic polymeric binders (FG-ZM01A/FG-ZM01D), a typical starting range is 0.3–1.0%. Always start at the lower end and run a 5-point dosage curve test, measuring dry flexural strength (MOR) at each increment. The optimal dosage varies with clay mineral content, particle size distribution, press pressure, and target green strength. Lab trial under your specific production conditions is mandatory before full-scale production scale-up.
Q4: Will organic binders cause dark core defects during firing?
Organic polymeric binders burn out during firing (L.O.I 50–55% for FG-ZM01 series). In a standard firing curve with adequate debinding time at 300–500°C, this is generally clean and does not cause defects. However, in fast firing cycles or thick-body products, insufficient debinding time can result in dark cores, surface blistering or cracking. A pilot kiln trial with cross-section inspection is mandatory before scaling up with organic binders. The risk increases with dosage — minimise dosage to the technically necessary level.
Q5: Can inorganic and organic binders be used together?
Combining inorganic and organic binders is technically feasible and used in some formulations. A common approach is ZG-302/ZG-303 as the base (for slurry stability and body mineral contribution) with a small addition of FG-ZM01D (for green strength peak). This may allow both targets — slurry process stability and high green strength — to be met at lower individual dosages than using either type alone. Compatibility and optimal ratio must be confirmed by lab trial under your specific body formula and process.
Q6: What is the standard test method for measuring ceramic green strength?
The standard method is the three-point flexural test (modulus of rupture, MOR in MPa) on dry-pressed or dried green bar samples of standardised dimensions. Additional practical indicators include edge chip resistance (corner-drop test), handling breakage rate by process stage, and dimensional stability after drying. For slurry-based processes, Ford Cup flow time and spray-dried powder bulk density and flowability are monitored alongside MOR during binder addition trials.
📋 Technical Content — Goway Ceramic Materials Technical Team

This application guide is prepared by the Goway Product Technical Team based on in-house formulation data, engineering evaluation, and customer field feedback from ceramic tile, porcelain and sanitaryware manufacturers in Southeast Asia, South Asia and the Middle East.

Manufacturing
Foshan Guyue New Materials Co., Ltd., Guangdong, China. ISO-certified production.
Annual Capacity
200,000 MT (phosphates) · 30,000 MT (solid deflocculants)
Technical Experience
15+ years supplying ceramic additives. Binder engineering team with hands-on kiln trial support.
Test Standards Applied
Three-point MOR test (GB/T 3810 reference method) · Ford Cup No. 4 flow time · Whiteness meter (1200°C fired)
Lab Equipment Referenced
Universal flexural tester · Lab spray dryer · Lab kiln (programmable, 1300°C max) · Ford Cup No. 4
Technical Documents Available
COA · TDS · SDS available on request for ZG-302, ZG-303, FG-ZM01A, FG-ZM01D. Contact Goway for latest batch documentation before production use.

Last Reviewed: May 2026 · Data source: Goway in-house testing (2025–2026) · For technical enquiries: en.goway-china.com/contact/

Request a Binder Sample Test Kit or Technical Recommendation

Not sure which binder grade fits your body formula? Submit your production parameters for a free dosage evaluation from Goway's ceramic technical team.

Production Data Needed for Binder Recommendation

Provide the following process parameters to help Goway's technical team prepare a specific binder recommendation and dosage starting point for your production. All information is treated as strictly confidential.

Current Green Strength (MOR)
e.g. 0.8 MPa dry flexural strength; or "breaking by hand after drying"
Current Breakage Rate & Stage
e.g. 3% breakage at transfer after pressing; 5% at drying exit
Body Formula Overview (Approximate %)
e.g. Kaolin 30%, Ball Clay 15%, Feldspar 35%, Quartz 20%
Current Binder Type & Dosage
e.g. ZG-302 at 0.8%; or no binder currently used
Forming Process
e.g. wet-process spray drying + dry press; or extrusion; or casting
Tile Size / Body Thickness
e.g. 600×600mm, 9mm thick; or 1200×600mm, 6mm thin tile
Press Pressure (MPa)
e.g. 28 MPa specific pressing pressure
Firing Curve Type
e.g. fast fire 50 min total / 1200°C peak; or tunnel kiln 8 hours
Target Green Strength (MOR)
e.g. minimum 1.5 MPa to allow automated stacking
Fired Whiteness Target
e.g. ≥88° at 1200°C; or no specific whiteness constraint
Monthly Consumption Estimate
e.g. 20 MT/month binder; or scale-up from pilot to full production
Country / Region
e.g. Malaysia, India, Brazil — for logistics and compliance reference

→ Submit your parameters via the Goway contact form or request COA, TDS, SDS for ZG-302, ZG-303, FG-ZM01A or FG-ZM01D.

⚠ Technical Disclaimer All performance data, dosage ranges, and product specifications in this guide are typical values based on Goway in-house testing and engineering evaluation (Goway in-house testing, 2025–2026). Performance varies with body formula, clay mineral composition, particle size distribution, pressing parameters, firing curve, and production equipment. A laboratory trial and pilot production validation under your specific conditions is essential before full-scale production implementation. Do not use industrial ceramic body binder products in food, pharmaceutical or personal care applications. This guide does not constitute a binding technical specification. Final product specifications should be confirmed with the latest batch Certificate of Analysis (COA) from Goway before purchase or production use. Data verified by Goway Product Technical Team. Last Reviewed: May 2026.

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