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Extrusion Aid Selection for Technical Ceramics: Achieving Smooth Surface and High Green Density
Quick Answer
Successful extrusion of technical ceramics depends on balancing three forces: inter-particle friction, paste-to-die friction, and internal cohesion. The extrusion aid system — composed of a plasticizer, a lubricant (internal and/or external), and a binder — modulates these forces. Without the right aid system, extrusion bodies produce surface cracks, internal density gradients, and dimensional deformation. Goway's FG-ZM01A and FG-ZM01D organic polymeric binders provide the green-strength component of this system; plasticizers and lubricants must be selected from third-party suppliers based on raw material chemistry.
Key Process Goals
- Target Green Density: > 55–65% of theoretical density for oxide ceramics before firing; > 50% for non-oxides P3 : Typical Engineering Target
- Surface Roughness: Ra < 3–5 μm for "smooth as-extruded" technical ceramic surfaces P2 : Reed, Principles of Ceramics Processing
- Extrusion Pressure: Typically 10–40 MPa for stiff-plastic bodies; < 5 MPa for near-liquid pastes P2 : Reed
- Moisture Window: 15–22 wt% for stiff extrusion; 22–35 wt% for soft/plastic extrusion; formulation-dependent P3 : Moisture Range Observed Across Technical Ceramics
- Green Strength Baseline: MOR > 0.5–2.0 MPa for handling; FG-ZM01 series contributes active polymer content of 90–98% P1 : Goway TDS, FG-ZM01A/D
Table of Contents
- Extrusion Mechanics: The Three-Force Balance
- The Three-Component Extrusion Aid System
- Formulation Design Principles
- Selection & Compatibility Matrix
- Process Troubleshooting
- Goway FG-ZM01 Series Positioning
- Laboratory Validation Protocol
- Frequently Asked Questions
- Request Technical Consultation
1. Extrusion Mechanics: The Three-Force Balance
1.1 The Governing Triad
Extrusion is fundamentally a rheological forming process — a plastic body is forced through a die of defined cross-section under pressure. Unlike slip casting (fluid-based) or dry pressing (granule-based), extrusion requires the body to behave as a Bingham plastic: a yield-stress material that flows only above a critical shear stress, then deforms continuously.
Three forces govern extrusion quality P2 : Reed, Ch. 21; Handle, Extrusion in Ceramics:
Friction (Fp-p)
Cohesion (Fcoh)
Friction (Fp-d)
| Force | Meaning | Too High → | Too Low → |
|---|---|---|---|
| Fp-p Inter-particle friction |
Friction between individual ceramic particles as they slide past each other during flow convergence | High extrusion pressure, laminations, internal shear planes, energy waste | Body flows before adequate packing — low green density, slumping after die exit |
| Fcoh Material cohesion |
The "stick-together" force: how well the paste holds as a continuous mass under tensile and shear stress | Stiff, unworkable body; spring-back after die exit | Surface tearing (transverse cracks), edge crumbling, inability to support self-weight after extrusion |
| Fp-d Paste-die friction |
Friction at the paste-die wall interface; determines surface finish and pressure drop along the die land | Surface drag marks, die wear, excessive pressure; center flows faster than edges → "coring" density gradient | Slippery extrusion — no back-pressure for compaction; surface roughness, low green density |
INSIGHT: The Extrusion Quality Window
The ideal extrusion paste sits at the intersection where Fp-p is low enough to permit flow but Fcoh is high enough to prevent tearing, while Fp-d is balanced for uniform velocity across the cross-section. This is why extrusion aid formulation is always a compromise, not a single "best" additive — the right balance depends on particle size distribution, shape complexity, and post-extrusion processing.
1.2 Why Particle Characteristics Dictate Aid Requirements
The starting powder properties determine which forces dominate — and therefore which extrusion aids are most needed P2 : Reed, Ch. 21; German, Powder Packing Characteristics:
| Powder Characteristic | Dominant Force | Aid Priority |
|---|---|---|
| Fine (< 1 μm), high surface area (e.g., Al2O3 d50 = 0.3 μm) | Fp-p — extremely high inter-particle friction from elevated contact points | Internal lubricant first, then plasticizer |
| Coarse (> 5 μm), angular particles (e.g., SiC, ZrO2 granules) | Fcoh — low natural cohesion; particles don't stick | Plasticizer + binder first |
| Platelet morphology (e.g., clay-containing bodies) | Fp-p + Fcoh both present — clay provides natural plasticity | Lubricant for die wall; less plasticizer needed |
| Non-oxide, hydrophobic (e.g., Si3N4, B4C) | Fcoh — water doesn't naturally wet the surface | Surfactant/plasticizer + binder first |
| Bimodal or multimodal PSD | Fp-p is naturally lower due to efficient packing | Lubricant-dominant; less plasticizer |
Data Gap Notice: Raw Material-Specific Data
Goway's FG-ZM01 series TDS does not include extrusion-specific testing across all ceramic powder families (alumina, zirconia, SiC, cordierite, etc.). The classification above is based on powder-handling fundamentals from ceramic forming textbooks. Extrusion aid selection must be validated through laboratory trials on the specific raw material system. Goway provides consultation support for trial design (see §9).
2. The Three-Component Extrusion Aid System
A complete extrusion aid system for technical ceramics consists of three functional components working in synergy. No single additive fills all three roles P2 : Reed, Ch. 21; Onoda & Hench, Ceramic Processing Before Firing:
2.1 Plasticizer — The Flow Enabler
Function: Plasticizers intercalate between particles and within the water phase, increasing the paste's plastic deformation range — the moisture content window within which the body can flow without cracking. They reduce the yield stress and increase the strain-to-failure.
Mechanism: Plasticizers work by adsorbing onto particle surfaces and creating a lubricating interlayer of bound water + polymer. This interlayer lets particles slide past each other with reduced friction while maintaining enough cohesion to prevent separation. The most common technical-ceramic plasticizers are water-soluble polymers that form gel-like structures P2 : Lewis, J. Am. Ceram. Soc., 2000.
| Plasticizer | Chemistry | Typical Dosage (wt% dry basis) | Key Feature | Limitation |
|---|---|---|---|---|
| Methylcellulose (MC) | Cellulose ether, thermal gelation at ~50–70 °C | 0.5–3.0% P3 | Thermal gelation provides excellent wet strength; burns clean at 300–450 °C | Viscosity-grade-dependent; A4M, A15C grades differ in water retention |
| Hydroxypropyl Methylcellulose (HPMC) | Modified cellulose ether, higher gelation temperature than MC | 0.3–2.5% P3 | Better thermal stability; less sensitivity to electrolytes | Higher cost than MC; may require defoamer for bubble control |
| Polyvinyl Alcohol (PVA) | Partially hydrolyzed, MW 20,000–100,000 g/mol | 1.0–4.0% P3 | Excellent film strength; widely used in tape casting and extrusion | Burns off at 400–550 °C; residual carbon risk for white bodies |
| Polyethylene Glycol (PEG) | Low-MW PEG 400–6000 | 1.0–5.0% P3 | Dual plasticizer + internal lubricant; low burnout temperature | Hygroscopic — extruded ware absorbs ambient moisture |
Data Gap Notice: No Goway Plasticizer Products
Goway does not manufacture or supply plasticizers (MC, HPMC, PVA, PEG). All plasticizer data in this section is drawn from published ceramic processing literature. Goway's role in the extrusion aid system is the binder component — see §2.3 and §6 below.
2.2 Lubricants — Internal vs. External
Lubricants reduce friction but operate at two fundamentally different interfaces. Confusing the two is one of the most common extrusion troubleshooting errors P2 : Onoda & Hench, Ceramic Processing Before Firing.
Action site: Particle-to-particle interface within the body
Reduces: Fp-p (inter-particle friction)
Result: Lower extrusion pressure, easier flow convergence, reduced lamination risk
Examples:
- PEG 400–6000 (0.5–3.0%)
- Glycerol (0.5–2.0%)
- Stearic acid (0.3–1.5%)
- Mineral oil (0.5–2.0%)
Dosage ranges from industry practice P3
Action site: Paste-to-die-wall interface
Reduces: Fp-d (die wall friction)
Result: Smoother surface finish, reduced velocity gradient across cross-section, less die wear
Examples:
- Stearate salts (Ca/Zn stearate, 0.5–2.0%)
- Wax emulsion (0.5–3.0%)
- PTFE micropowder (0.1–1.0%)
- Graphite (for non-oxide reducing atmosphere)
Dosage ranges from industry practice P3
WARNING: The "Slippery Slope" of Over-Lubrication
Excessive external lubrication creates a hydrodynamic film at the die wall that eliminates back-pressure. Without back-pressure, the paste exits the die without compaction — producing a rough surface, lowered green density, and dimensional instability. The goal is boundary lubrication (thin film), not hydrodynamic lubrication (thick film). If the extrudate surface feels "greasy" immediately after exit, external lubricant dosage is likely too high.
2.3 Binder — The Strength Provider
Function: Binders provide green strength — the mechanical integrity of the extruded body before firing. This is critical for:
— Handling after extrusion (cutting, stacking, transporting green ware)
— Resisting drying stresses without cracking
— Maintaining sharp edge definition and thin-wall integrity during binder burnout
The binder component is where Goway's product line is relevant. FG-ZM01A and FG-ZM01D are organic polymeric binders designed for ceramic body strengthening:
| Property | FG-ZM01A | FG-ZM01D | Source |
|---|---|---|---|
| Active Ingredient | 95–98% | 90–95% | P1 : Goway TDS |
| Inorganic Salt By-product | 3–8% | 5–8% | P1 : Goway TDS |
| Unreacted Monomer / Oligomer | < 2% | < 2% | P1 : Goway TDS |
| Loss on Ignition | 50–55% | 50–55% | P1 : Goway TDS |
| Polymer Type | Organic Polymeric Binder — suitable for ceramic body strengthening in pressing and extrusion contexts | P1 : Goway TDS | |
| Primary Function in Extrusion | Provides dry/handling green strength; synergistic with plasticizers; burns out cleanly during bisque firing | P1 : Goway TDS | |
Data Gap Notice: Extrusion-Specific Performance
While FG-ZM01A/D are general-purpose body binders, their TDS does not contain extrusion-specific performance data (e.g., "X% addition yields Y MPa MOR in extruded alumina with moisture content Z%"). The effectiveness in any specific extrusion formulation depends on the plasticizer/binder ratio, raw material chemistry, particle size distribution, and moisture content. Goway recommends laboratory trials — see §7 for a validation protocol.
For a detailed discussion of binder selection principles, see our Improve Ceramic Green Strength: Binder Selection guide.
2.4 Synergy: Why the Three Components Must Be Designed Together
The three components interact — adding more binder without adjusting lubricant can stiffen the body excessively, while adding lubricant without sufficient plasticizer can create a "slippery but brittle" paste that tears under tension. The optimal ratio is system-dependent P2 : Reed, Ch. 21:
| Body Type | Plasticizer : Lubricant : Binder (typical ratio) | Effect of Imbalance |
|---|---|---|
| Alumina (fine, d50 < 1 μm) | 1 : 2 : 1 (lubricant-heavy) | Too much binder → stiff, high pressure; too little lubricant → laminations |
| Zirconia (ultra-fine, high surface area) | 1 : 1.5 : 1.5 | Too little plasticizer → cracks during die convergence |
| Silicon carbide (non-oxide, angular) | 2 : 1 : 2 (plasticizer + binder heavy) | Low natural cohesion — needs more of both plasticizer and binder |
| Cordierite (clay-based, naturally plastic) | 0.5 : 1 : 0.5 (overall lower dosage) | Clay provides inherent plasticity; aids are supplementary |
Ratios shown are illustrative starting points derived from ceramic extrusion literature P3 : Typical Engineering Starting Ratios. Actual optimization requires systematic trials (see §7).
3. Formulation Design Principles
3.1 Working Backwards from Product Requirements
The most reliable approach to extrusion aid selection is to start from the finished product requirements and work backwards through each processing step P2 : ASTM C198-07; Handle, Extrusion in Ceramics.
1. Final Product Spec
Wall thickness? Sharp corners? Hollow cross-section? Define the geometry's extrusion difficulty. Thin walls (< 1 mm) demand higher plasticity; complex cross-sections (honeycomb) require uniform velocity profile → balanced Fp-d.
2. Firing Requirements
Binder burnout temperature and atmosphere tolerance. FG-ZM01 series burns out cleanly at < 500 °C in air. For reducing-atmosphere sintering (e.g., Si3N4), carbon residue from organic binders must be managed.
3. Drying Sensitivity
Thick cross-sections (> 10 mm) are drying-crack-prone. Binder + plasticizer system must provide sufficient wet strength to survive capillary tension during moisture removal.
4. Raw Material Constraints
Powder surface chemistry determines plasticizer adsorption. Non-oxides (SiC, Si3N4) may need surfactant pre-treatment before plasticizer addition (see Reduce Ceramic Slurry Viscosity for rheology fundamentals).
3.2 The Moisture Content Decision
Moisture content is the primary process variable that interacts with aid dosage. The relationship is inverse: higher moisture → less aid needed, but more drying shrinkage and cracking risk. Lower moisture → more aid needed, but dimensional stability improves P2 : Reed, Ch. 21.
| Extrusion Type | Moisture Range | Aid Dosage Trend | Typical Application |
|---|---|---|---|
| Stiff extrusion | 12–18% | High aid loading (5–12% total organics) | Catalyst supports, kiln furniture, structural tubes |
| Plastic extrusion | 18–25% | Moderate (2–6% total organics) | Cordierite honeycomb, alumina rods, zirconia tubes |
| Soft extrusion / paste | 25–35% | Low (1–3% total organics) | Fine-diameter thermocouple sheaths, capillary tubes |
3.3 Grinding and Mixing: The Pre-Extrusion Foundation
Extrusion aid effectiveness depends critically on homogeneous distribution. Agglomerated binder particles create localized density variations that manifest as surface defects or internal voids P2 : Reed, Ch. 21. For guidance on achieving uniform particle size distribution before extrusion, see our Ball Mill Energy & Grinding Aids article.
4. Selection & Compatibility Matrix
4.1 Additive Compatibility: What Works with What
Not all extrusion aid combinations are compatible. Some plasticizers and binders compete for adsorption sites; some lubricants phase-separate in the aqueous medium P2 : Reed; Onoda & Hench.
| Primary Aid | Compatible With | Incompatible / Caution With |
|---|---|---|
| Methylcellulose (MC) | FG-ZM01 series (binder), PEG (lubricant), glycerol, stearates | High-salt-content water — MC can salt-out, losing gel structure. Test with production water before finalizing. |
| PVA (high hydrolysis) | FG-ZM01 series (binder), glycerol, PEG 400 | Stearate salts — may form insoluble soaps with Ca²⁺/Mg²⁺ in hard water; use DI water. |
| FG-ZM01A (binder) | MC, HPMC, PVA (plasticizers); PEG, glycerol, stearates (lubricants) | Strongly acidic or alkaline systems (pH < 4 or pH > 10) may hydrolyze the polymer backbone — verify pH compatibility. |
| FG-ZM01D (binder) | Same as FG-ZM01A; slightly lower active content may benefit from slightly higher dosage | Same pH sensitivity as FG-ZM01A |
| Wax emulsion (ext. lub.) | MC, HPMC, FG-ZM01 series | PVA — wax may interfere with PVA film-formation, reducing binder effectiveness. |
4.2 Selection Decision Tree
5-Step Selection Logic
Step 1: Is the body clay-based (> 10% clay)? If yes → skip plasticizer; start with lubricant + binder only. If no → full three-component system.
Step 2: Is the cross-section complex (honeycomb, thin-walled, multi-channel)? If yes → prioritize external lubricant for uniform velocity. If no (simple rod/tube) → standard balance.
Step 3: Will the product be fired in reducing atmosphere? If yes → minimize organic aids; consider FG-ZM01 series (burns cleanly < 500 °C). If no (air-firing) → standard organic loading acceptable.
Step 4: Is target wall thickness < 1 mm? If yes → increase plasticizer ratio to prevent tearing. If no → standard balance.
Step 5: Is green machining required after extrusion? If yes → prioritize binder strength (FG-ZM01A at higher dosage). If no → standard binder loading. P3 : Engineering Design Logic
5. Process Troubleshooting
5.1 Defect → Cause → Solution Matrix
| Extrusion Defect | Appearance | Most Likely Cause | Correction |
|---|---|---|---|
| Surface transverse cracks (perpendicular to extrusion direction) | Regularly spaced cracks, "bamboo" pattern | Insufficient cohesion (Fcoh too low). Plasticizer or binder content inadequate. | ↑ Plasticizer dosage by 0.5% increments; ↑ FG-ZM01 binder by 0.3% increments; or ↑ moisture 1–2%. Test after each change. |
| Longitudinal cracks / laminations (parallel to extrusion direction) | Cracks along the extrusion axis, internal shear planes visible on cutting | Internal friction (Fp-p) too high. Particles fail to shear past each other; body laminates instead. | ↑ Internal lubricant (PEG, glycerol) by 0.5–1.0%; verify PSD is not excessively wide; ↑ moisture 1–2% |
| Surface drag / "shark-skin" | Rough, ridged surface texture; transverse ridges at die exit | Die wall friction (Fp-d) too high; stick-slip at paste-die interface | ↑ External lubricant (stearate, wax) by 0.3–0.5%; polish die land; check die land length (too long → excessive drag) |
| Cross-section deformation (coring, warping) | Center flows faster than edges → barrel shape; or edges expand more → hourglass | Non-uniform velocity profile — Fp-d creates gradient across section | Adjust die land length (longer land → more uniform); ↑ external lubricant to reduce wall friction gradient; check that paste homogeneity is adequate |
| Excessive extrusion pressure | Pressure gauge reading 30–40%+ above baseline; risk of equipment stall | Overall aid loading too low, or moisture too low, or PSD too fine | First ↑ moisture 1–2% (fastest); then ↑ internal lubricant 1%; check that paste mixing time is adequate for uniform aid distribution |
| Low green density | Crumbly edge, low MOR, high firing shrinkage | Insufficient compaction due to: too little back-pressure, or air entrapment, or inadequate plastic deformation | ↓ External lubricant to increase die back-pressure; verify de-airing is effective (vacuum extrusion essential); ↑ plasticizer to improve particle rearrangement |
| Edge crumbling / poor edge definition | Rounded or ragged edges, especially on square/rectangular profiles | Edge velocity higher than center velocity → material pulled apart at corner. Or Fcoh too low. | Balance die land geometry (longer land at edges); ↑ binder content (FG-ZM01A) by 0.5%; verify moisture is uniform — uneven wetting causes localized weakness |
| Spring-back / elastic recovery | Extrudate expands after die exit; dimensions larger than die opening | Elastic energy stored during die convergence not fully relaxed; clay content too high, or plasticizer ineffective | ↓ Clay content if possible; ↑ plasticizer to provide more plastic (irreversible) deformation; reduce extrusion speed to give more relaxation time |
5.2 Quick Diagnostic Flowchart
- Identify the Defect Direction. Cracks perpendicular to extrusion → cohesion issue (Step 2). Cracks parallel → friction issue (Step 3). Surface texture → die-wall issue (Step 4).
- Cohesion Issue: Increase binder (FG-ZM01A) by 0.3% and/or plasticizer by 0.5%. Re-test. If improved but still cracking → continue incremental increase. If no improvement → check mixing procedure; agglomerated binder is ineffective.
- Friction Issue (Internal): Increase internal lubricant (PEG/glycerol) by 0.5–1.0%. Re-test. If improved → fine-tune dosage. If no improvement → check PSD; excessively fine or broad PSD may need grinding adjustment.
- Friction Issue (Die Wall): Increase external lubricant by 0.3–0.5%. Re-test. Caution: too much external lubricant → low back-pressure → low density. Balance incrementally.
- Moisture as Final Lever: If aid adjustments alone don't resolve, increase moisture by 1–2% and restart optimization. Higher moisture widens the processing window but increases drying burden.
6. Goway FG-ZM01 Series: Positioning in the Extrusion System
Transparency Statement
Goway does not market a complete, pre-formulated extrusion aid package (plasticizer + lubricant + binder). FG-ZM01A and FG-ZM01D are organic polymeric binders that form one component — the green-strength provider — of a full extrusion aid system. Plasticizers and lubricants must be sourced from third-party suppliers. Goway's value in extrusion applications is: (1) reliable, high-active-content binder; (2) technical consultation on system-level aid design; (3) trial design support.
6.1 FG-ZM01A vs. FG-ZM01D for Extrusion
| Consideration | FG-ZM01A (Active 95–98%) | FG-ZM01D (Active 90–95%) |
|---|---|---|
| When to choose | High green-strength requirement: thin-wall (< 1 mm), sharp corners, green machining needed | Standard extrusion: moderate wall thickness, simple profiles, adequate handling strength sufficient |
| Typical starting dosage | 1.5–3.0% of dry body weight P3 | 2.0–4.0% of dry body weight (compensate for lower active content) P3 |
| Cost-effectiveness | Higher unit cost; lower dosage needed | More economical for high-volume extrusion where ultimate green strength is not critical |
| Burnout behavior | Both grades: clean burnout < 500 °C in air; L.O.I 50–55% P1 : Goway TDS | |
6.2 Goway's Support for Extrusion Applications
Service 1: Binder Selection & Dosage Optimization
Technical consultation on whether FG-ZM01A or FG-ZM01D is more appropriate for your extrusion application, based on product geometry, green strength requirements, and firing profile.
Service 2: System-Level Formulation Guidance
While Goway does not supply plasticizers or lubricants, we provide guidance on the complete three-component system: recommended plasticizer types, lubricant categories (internal vs. external), and expected interaction effects with FG-ZM01 binders.
Service 3: Trial Design Support
We can help design a systematic trial protocol (see §7) that efficiently maps the plasticizer-lubricant-binder interaction space for your specific raw material and product geometry.
Service 4: Process Efficiency Connection
Our broader process optimization expertise — in grinding, slurry rheology, and spray drying — connects extrusion to upstream and downstream operations for holistic process improvement.
7. Laboratory Validation Protocol
7.1 Systematic Trial Design
The following protocol is designed to evaluate extrusion aid systems with minimum trial runs while capturing interaction effects P2 : Adapted from ASTM C198-07 principles.
- Establish Baseline. Prepare body at target moisture content with no additives. Measure extrusion pressure, note any defects, measure green density (Archimedes). This is your control.
- Single-Component Screening. Add only plasticizer (MC, 2% of dry weight). Extrude. Measure pressure, inspect surface. Repeat with only lubricant (PEG 400, 2%). Repeat with only binder (FG-ZM01A, 2%). Record which single component gives the greatest improvement.
- Two-Component Combinations. Based on Step 2 results, test plasticizer + lubricant, plasticizer + binder, lubricant + binder — each at half the single-component dosage (1% + 1%). Identify the most synergistic pair.
- Three-Component Full System. Test the complete system at a starting ratio suggested by Steps 2–3 (e.g., 1:1:1 for all three). Fine-tune ratios based on defect patterns.
- Dosage Optimization Ladder. Once the optimal ratio is identified, test total loading at 80%, 100%, 120% of the working dosage. Record extrusion pressure curve, green density, and surface roughness at each level.
- Stability Check. Hold optimized paste in sealed container for 4–24 hours. Re-extrude. Significant deterioration indicates component incompatibility or decomposition — reformulate.
7.2 Key Measurements
| Measurement | Method | Target / Interpretation |
|---|---|---|
| Extrusion pressure curve | Pressure transducer on extrusion barrel; record vs. time/position | Stable plateau → good steady-state flow. Rising trend → die blockage or moisture loss. Falling trend → phase separation. |
| Green density | Archimedes (weight in air / weight in mercury or oil) | Compare to baseline; aim for ≥ 5–10% improvement over additive-free body P3 |
| Green MOR | 3-point bending on extruded rod; ASTM C1161 (adapted for green body) | Minimum 0.5 MPa for handling of small parts; > 1.0 MPa for large/heavy sections P3 |
| Surface roughness (Ra) | Stylus profilometer or optical profilometry on as-extruded surface | Ra < 3 μm for "smooth" technical ceramic extrusion P2 : Reed |
| Dimensional tolerance | Caliper measurement at 3–5 points along extrudate length | ± 1–2% of target dimension for as-extruded green body P3 |
8. Frequently Asked Questions
Not recommended for most technical ceramics. FG-ZM01A/D provide binder function (green strength) but they are not plasticizers — they do not significantly reduce the yield stress or increase the strain-to-failure of the paste. In clay-based bodies that already have natural plasticity, binder-only can sometimes work. For oxide and non-oxide technical ceramics with no clay content, a full system (plasticizer + lubricant + binder) is strongly advised.
FG-ZM01A (95–98% active) delivers higher green strength per unit weight P1 : Goway TDS. Choose it when strength is the limiting factor — thin-walled honeycomb, green-machined parts, fragile profiles. FG-ZM01D (90–95% active) is more cost-effective for standard extrusion where moderate green strength suffices. If in doubt, start with FG-ZM01D for cost efficiency and switch to FG-ZM01A only if green strength measurements are below target.
Treating all three additives as interchangeable. The most common error is increasing binder when the real problem is die-wall friction (needs external lubricant), or adding lubricant when the body lacks plasticity (needs plasticizer). Always diagnose which force — Fp-p, Fp-d, or Fcoh — is out of balance before adjusting the formulation (see §5 troubleshooting matrix).
No. Goway supplies the binder component (FG-ZM01A/D) only. Plasticizers (MC, HPMC, PVA, PEG) and lubricants (stearates, wax emulsions) must be purchased from specialized chemical suppliers. Goway can provide guidance on system-level formulation and recommend compatible third-party additive types based on your application. This is the same transparent positioning outlined in our FG-ZM01 product page.
Organic additives must be completely removed during the binder burnout phase of firing — typically 300–500 °C with a slow ramp (0.5–2.0 °C/min) to prevent internal pressure buildup. Exothermic decomposition of some plasticizers (MC, PVA) can cause localized hot spots if the ramp is too fast. FG-ZM01 series burns out cleanly below 500 °C in air P1 : Goway TDS. For reducing-atmosphere firing, carbon residue risk must be evaluated — higher total organic loading requires longer burnout dwell.
Yes — significantly. The particle size distribution from upstream grinding directly determines the inter-particle friction (Fp-p) that extrusion aids must manage. An excessively fine, narrow PSD creates high friction requiring more lubricant; a poorly mixed, agglomerated powder prevents even aid distribution. See our ball mill energy and grinding aids optimization guide for optimizing the grinding step before extrusion formulation.
9. Request Technical Consultation for Extrusion Aid Selection
Get Extrusion Formulation Support
Tell us about your technical ceramic extrusion challenge — we'll help you design a binder + aid system for smooth surface, high green density, and dimensional accuracy.
- Raw Material System: Ceramic type (alumina, zirconia, SiC, cordierite, etc.), particle size distribution, specific surface area, any clay content
- Product Geometry: Cross-section shape, wall thickness, complexity (simple rod/tube vs. honeycomb/multi-channel), target dimensions and tolerances
- Current Defect Description: Surface cracks (transverse or longitudinal), density variation, surface roughness, excessive pressure, dimensional instability — with photos if available
- Existing Aid Usage: Current plasticizer, lubricant, and binder types and dosages; processing equipment (piston vs. screw extruder, de-airing capability)
Note: Goway supplies the binder component (FG-ZM01A/D). Plasticizers and lubricants are third-party products — we provide system-level guidance, not a complete premix.
Goway Chemical is a Guangdong-based ceramic materials manufacturer with 15+ years of industry experience and an annual production capacity of 30,000 metric tons. As the first automated solid deflocculant producer in Guangdong, Goway holds ISO and REACH certifications. Our technical team provides formulation support for ceramic body binders, deflocculants, and processing aids across pressing and extrusion applications.
Disclaimer: This guide is for technical reference only. Extrusion aid performance depends on raw material characteristics, processing equipment, and firing conditions — results may vary. FG-ZM01A/D binder specifications are based on Goway Technical Data Sheets P1 and verified by Goway Product Team. Plasticizer and lubricant data represents published ceramic processing knowledge P2 and industry experience P3, and is not derived from Goway product testing. All third-party additive descriptions are based on publicly available literature; Goway makes no performance warranty for non-Goway products. Laboratory trials under your specific conditions are essential before production implementation. Final product parameters should be verified against the latest batch Certificate of Analysis.
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