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Ceramic Deflocculant Guide: How to Choose the Right One for Your Slip
Ceramic Deflocculant Guide: How to Choose the Right One for Your Slip
What Is a Deflocculant (Dispersant) in Ceramics?
A deflocculant reduces viscosity in ceramic slips by increasing the zeta potential of clay particles, creating electrostatic repulsion that prevents flocculation (per DLVO theory). This allows higher solid content (>65%) without water addition — improving casting rate and drying strength.
How to Compare Deflocculants: 4 Key Factors
- Colloidal Stability Duration
Will your slip sit for 2 days or 14 days? Bacterial resistance matters. - Sodium Content
High Na⁺ can cause glaze defects or efflorescence in fired ware. - Raw Material Compatibility
Some deflocculants react poorly with ball clay or feldspar. - Total Cost per Ton of Cast Ware
Don’t just compare $/kg — factor in slurry loss, rework, and downtime.
Deflocculant Comparison Table
| Deflocculant | Type | Typical Dosage | Stability | Na⁺ Content | Best For |
|---|---|---|---|---|---|
| STPP (Sodium Tripolyphosphate) |
Inorganic | 0.1–0.3% | ★★★★★ (>14 days) |
High | Tile bodies, sanitaryware, long storage |
| SHMP (Sodium Hexametaphosphate) |
Inorganic | 0.05–0.2% | ★★★★☆ (7–10 days) |
High | Fine casting, low-viscosity slips |
| DFP (Darvan F Powder) |
Synthetic polyelectrolyte | 0.2–0.5% | ★★★☆☆ (3–5 days) |
Low | Whiteware, low-sodium requirements |
| Lignosulfonate | Organic (by-product) | 0.3–0.8% | ★☆☆☆☆ (<48 hours) |
Medium | Budget production, immediate use |
When to Choose STPP vs SHMP vs DFP?
- Choose STPP if: You need maximum stability, work in warm climates, or have had hard-pan issues. Ideal for large tile factories.
- Choose SHMP if: You require ultra-low viscosity for thin castings (e.g., tableware), and can use slip within 1 week.
- Choose DFP if: Your final product is sensitive to sodium (e.g., electrical porcelain), and you accept shorter shelf life.
Pro Tips from Goway’s R&D Team
- Always test deflocculant with your actual raw materials — ball clay variability greatly affects performance.
- For STPP/SHMP, maintain pH ≥ 9.5 with soda ash to maximize charge repulsion.
- Never mix organic and inorganic deflocculants — they can neutralize each other.
Guide compiled by Goway Technical Services – supporting ceramic manufacturers in 28 countries since 2016. All data based on real plant trials.
📥 Download Free Deflocculant Selection Chart (with Dosage Calculator)
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