Selecting the right strength enhancer for ceramic tile and sanitaryware production involves balancing chemical composition, green strength targets, firing behavior and cost. This guide provides a practical comparison of three commonly used Goway enhancers — FG-G301, FG-G303 and FG-ZM01 — to help ceramic engineers and technical managers make informed decisions based on body formulation and production requirements.

The chemical composition of strength enhancers directly influences green body compaction, drying shrinkage, firing behavior and final product quality. Understanding the SiO₂/Al₂O₃ ratio, alkali metal content and loss on ignition (LOI) is essential for matching the right enhancer to specific ceramic bodies and production processes.

This guide covers chemical composition analysis, performance comparison methodology, application matching tables, dosage guidelines with strength improvement data, and compatibility with the deflocculant system (e.g., Sodium Tripolyphosphate (STPP) or Sodium Hexametaphosphate (SHMP)). It is intended for technical directors, ceramic engineers and R&D staff involved in body formulation and process optimization.

1. Chemical Composition Comparison: Understanding the Data

The following table presents the chemical composition of FG-G301, FG-G303 and FG-ZM01. These values represent typical ranges based on Goway product specifications and in-house testing (2025). Understanding these parameters is the first step in selecting the appropriate enhancer for your ceramic body.

1.1 How Does Chemical Composition Affect Ceramic Green Strength?

SiO₂ (Silicon Dioxide): The primary network former in ceramic bodies. Higher SiO₂ content (as in FG-G301, 65-70%) may improve green body compaction and reduce drying shrinkage. In the fired body, SiO₂ contributes to the silicate network and influences thermal expansion behavior.

Al₂O₃ (Aluminum Oxide): Increases refractoriness and mechanical strength after firing. FG-G301 has slightly higher Al₂O₃ (14-16%) compared to FG-G303 and FG-ZM01 (13-15%). This may make FG-G301 more suitable for bodies requiring higher fired strength or where higher firing temperatures are used.

Fe₂O₃ (Iron Oxide): All three products maintain Fe₂O₃ at 1-2%. While iron is a common flux, levels below 2% typically do not cause significant body darkening in oxidized firing. For products requiring high whiteness (e.g., premium polished tiles), consider additional body composition adjustments and firing atmosphere control.

Alkali Metals (Na₂O, K₂O, CaO, MgO): These act as fluxes during firing, promoting densification at lower temperatures. The total alkali content (Na₂O + K₂O + CaO + MgO) is similar across all three products (approximately 5-9%). FG-G303 and FG-ZM01 have slightly higher LOI (6-7% vs. 5-6%), which may indicate different organic additive contents that affect green strength development mechanisms.

2. Application Matching: Which Enhancer for Which Product?

The selection of strength enhancer should be based on the specific ceramic product type, body formulation characteristics, and production process parameters. The following table provides a practical matching guide for common ceramic products.

2.1 Body Formulation Considerations

When selecting an enhancer, consider the existing body formulation's SiO₂/Al₂O₃ ratio. If the base body already has high Al₂O₃ from ball clay or kaolin, adding FG-G301 may push the ratio too high, potentially requiring higher firing temperatures. In such cases, FG-G303 or FG-ZM01 with slightly lower Al₂O₃ may be preferable.

Conversely, if the body is SiO₂-rich (e.g., high quartz content), FG-G301 can help balance the composition and improve fired strength. The alkali metals in all three enhancers act as supplemental fluxes, which may allow slight reductions in feldspar content while maintaining adequate firing behavior.

3. Dosage Guidelines: Expected Strength Improvement at Different Addition Rates

The relationship between enhancer dosage and green strength improvement is not always linear. Low additions may provide significant relative improvement, while higher additions may show diminishing returns. The following table presents typical strength improvement data based on laboratory press trials and published ceramic engineering literature.

4. Deflocculant Compatibility: Using Enhancers with STPP, SHMP and Polycarboxylates

Strength enhancers and deflocculants are often used together in ceramic body formulations. However, their interaction can affect slurry viscosity, granule properties and final product quality. Understanding compatibility and proper addition sequence is essential.

4.1 Are Ceramic Strength Enhancers Compatible with STPP and Polycarboxylate Deflocculants?

FG-G301, FG-G303 and FG-ZM01 are compatible with commonly used ceramic deflocculants, including:

• Sodium Tripolyphosphate (STPP): Commonly used for ceramic slip deflocculation. Compatible with all three enhancers when added in proper sequence.
• Sodium Hexametaphosphate (SHMP): Provides strong deflocculation effect, particularly in hard-water ceramic slurry conditions. Compatible, but monitor slurry viscosity changes after enhancer addition.
• Polycarboxylate dispersants: Synthetic polymers with high deflocculation efficiency. Generally compatible, but avoid simultaneous high-concentration addition with enhancers.
• Silicate-based deflocculants: Used in some sanitaryware formulations. Compatible with FG-G303 and FG-ZM01.

4.2 Recommended Addition Sequence

The addition sequence affects how deflocculants and strength enhancers interact in the slurry. The following sequence is recommended based on ceramic engineering practice:

4.3 Troubleshooting: Why Does Slurry Viscosity Increase After Adding Strength Enhancers?

5. How to Select and Test Ceramic Strength Enhancers: Step-by-Step Protocol

Laboratory testing before production adoption is strongly recommended. The following step-by-step protocol provides a structured approach to evaluating FG-G301, FG-G303 and FG-ZM01 for your specific ceramic body.

1. Step 1: Define body type and performance targets Identify the ceramic body type (polished tile, glazed tile, sanitaryware), target green strength increase (%), and any firing temperature constraints. Review current body formulation to understand existing Al₂O₃/SiO₂ ratios and alkali content. Document current green strength, drying shrinkage and firing behavior as baseline (control) values.
2. Step 2: Select candidate enhancer based on application table Use the Application Matching Table in Section 2 to shortlist 1-2 candidate products. For polished tiles, consider FG-G301. For glazed tiles or cost-sensitive formulations, FG-G303 or FG-ZM01 may be options. For sanitaryware, FG-G303 or FG-ZM01 are frequently used. Prepare at least 5 kg body mix per trial condition.
3. Step 3: Run laboratory press trials with 3 dosage levels Prepare laboratory pressed samples at 0.5%, 1.5% and 2.5% addition rates (by weight of dry body mix). Add STPP deflocculant first during ball milling, then add enhancer after milling. Measure green strength (MPa, three-point bending per GB/T 3810.4), drying shrinkage (%), water absorption after firing (%), and visual defects. Compare against control samples. Prepare at least 10 test pieces per condition for statistical reliability.
4. Step 4: Check deflocculant compatibility If using STPP, SHMP or polycarboxylate deflocculants, verify that enhancer addition does not negatively affect slurry fluidity. Measure slurry viscosity (Brookfield or Ford Cup) before and after enhancer addition. If viscosity increases by more than 20%, consider adding 0.05-0.10% additional deflocculant.
5. Step 5: Validate at pilot scale and optimize dosage After laboratory confirmation, run pilot spray drying and pressing trials. Monitor granule properties (particle size distribution, moisture uniformity), press performance (filling behavior, ejection quality), and green body quality. Adjust dosage in 0.3% increments to find the optimal addition rate. Document all parameters and results for future reference.

6. Industry Reference Data: Typical Operating Parameters for Ceramic Strength Enhancers

The following table provides reference parameter ranges based on published ceramic processing literature, equipment manufacturer recommendations, and typical industry practice (2015-2024). These values are for benchmarking and should not be used as absolute specifications without verification in your specific process conditions.

7. Frequently Asked Questions