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STPP in Ceramic Slurry Systems: Mechanisms, Applications and Grade Selection

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2026-07-21

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Sodium Tripolyphosphate STPP | Ceramic Deflocculant/Dispersant | Goway Chemical

Sodium Tripolyphosphate STPP · Ceramic Deflocculant / Dispersant

Product Snapshot: Sodium Tripolyphosphate (STPP) is a widely used inorganic deflocculant and dispersant in the ceramic industry, offering excellent chelating, dispersing and viscosity-reducing properties. Widely applied in ceramic body slurries, glaze preparation and detergent industry. Goway offers four grades — FG-1003, FG-N5, FG-N8 and FG-N9, with Na₅P₃O₁₀ content ranging from 12% to 56%, meeting various formulation and cost requirements, with insoluble content as low as 0.1%.

0.3%–0.5% Recommended Dosage (Body/Glaze)

56% Max Na₅P₃O₁₀ Content (FG-1003)

4 Grades Covering Different Purity & Cost Ranges

0.1% Minimum Insoluble Content

25 kg Standard Packaging / Bag

🧪 Core Functions of STPP in Ceramics

🔀

Efficient Deflocculation & Dispersion

Through dual mechanisms of chelation and electrostatic repulsion, effectively breaks down clay particle agglomerates, significantly reducing slurry viscosity and improving flowability.

💧

Viscosity Reduction & Water Saving

Reduces water demand at the same solids content, improves body density, shortens drying cycles and lowers energy consumption.

🧲

Strong Chelating Ability

Effectively chelates Ca²⁺, Mg²⁺ and other hard water ions, eliminating ionic interference and ensuring stable slurry viscosity, especially suitable for hard water areas.

⏳

Suspension Stability

Prevents settling of heavy particles, extends slurry storage and circulation cycles, reduces sediment accumulation in storage tanks.

🎯

Improved Glazing Performance

Optimizes glaze rheology, improves atomization uniformity and curtain stability, reduces glazing defects.

🧼

Multi-Industry Versatility

Beyond ceramics, widely used in detergents, water treatment, electroplating and other industries — one of the most versatile phosphates.

🏭 Typical Application Scenarios

🏺 Ceramic Body Slurry

Added to body slurries to significantly reduce milled slurry viscosity, improve pumping efficiency, reduce stratification and sedimentation. Suitable for wall/floor tiles, tableware, sanitaryware and more.

🎨 Ceramic Glaze

In glaze preparation, STPP effectively disperses frits, pigments, zirconium silicate and other components, improving glaze flowability and application uniformity.

🧼 Detergent Industry

As a detergent builder, STPP chelates hard water ions and enhances detergency, serving as a key component in powder and liquid detergents.

💧 Water Treatment & Industrial Cleaning

Leveraging its chelating and dispersing properties, used in circulating water scale inhibition, industrial pipe cleaning and metal surface treatment.

📊 Product Series & Technical Specifications

Typical specifications of Goway's four STPP grades. Na₅P₃O₁₀ content ranges from 12% to 56%, flexibly adaptable to different formulations and cost requirements.

Code	Whiteness	Na₅P₃O₁₀ (%)	NaPO₃ (%)	Insoluble (%)
FG-1003	90	56	94	≤0.1
FG-N5	85	36	90	≤0.1
FG-N8	83	20	90	≤0.1
FG-N9	80	12	90	≤0.1

※ Whiteness refers to product whiteness; Na₅P₃O₁₀ content is the active ingredient; Insoluble refers to acid-insoluble content, reflecting product purity. Grades sorted by Na₅P₃O₁₀ content (high to low).

📦 Packaging: 25 kg / woven bag (with inner plastic liner) 🎯 Recommended Dosage: 0.3% – 0.5% (dry basis, adjust based on formulation) 🧪 Appearance: White powder 📋 Quality Positioning: Standard · Stable · Multiple grades

✨ Grade Selection Guide — Match Purity & Cost Flexibly

🔹 FG-1003 High Purity Na₅P₃O₁₀ content 56%, whiteness 90, insoluble ≤0.1%. Ideal for premium ceramics and fine chemical applications demanding the highest deflocculation efficiency and purity.

🔹 FG-N5 Standard High Purity Na₅P₃O₁₀ content 36%, whiteness 85. Excellent cost-performance, widely used in various ceramic body slurries and glaze preparations.

🔹 FG-N8 Standard Grade Na₅P₃O₁₀ content 20%, whiteness 83. Suitable for conventional ceramic production, balancing performance and cost.

🔹 FG-N9 Economy Grade Na₅P₃O₁₀ content 12%, whiteness 80. Suitable for applications with moderate deflocculation requirements and cost priority, such as certain body slurries and detergent compounding.

💡 Selection Tips: For high deflocculation efficiency and slurry stability → prioritize FG-1003 or FG-N5; standard mass production → FG-N8; cost-sensitive applications → FG-N9. Adjust based on water hardness and raw material characteristics.

📝 Operational Guidelines

To maximize the deflocculation and dispersion effect of STPP, we recommend following these operational practices:

Batch Addition: Add together with ceramic raw materials at the beginning of ball milling, or in 2–3 gradual additions during slurry mixing to ensure uniform dispersion.
Control Dosage: Recommended starting dosage is 0.3% of total dry weight, fine-tune based on actual slurry viscosity measurement, not exceeding 0.5%.
Monitor Water Quality: In hard water areas, increase dosage appropriately to offset Ca²⁺ and Mg²⁺ consumption, but determine optimal dosage through trials.
Avoid Direct Mixing with Strong Acids/Alkalis: STPP may hydrolyze under extreme pH conditions; maintain slurry pH in the 8–10 range.
Storage Conditions: Store in a dry, cool place, avoid moisture and caking. Use promptly after opening.

⭐ Core Advantages of Goway STPP

High-purity FG-1003 with 56% active ingredient, high deflocculation efficiency

Insoluble content as low as 0.1%, extremely low impurities

Strong chelating ability, effectively eliminates hard water ion interference

Multiple grades covering different formulation and cost requirements

High whiteness, does not affect ceramic body or glaze tone

Compatible with Goway other deflocculants and binders for synergistic use

High batch-to-batch consistency ensuring long-term production stability

Free technical support for formulation optimization and problem solving

❓ Frequently Asked Questions

What is the difference between STPP and SHMP (Sodium Hexametaphosphate)?

Both STPP and SHMP are common inorganic deflocculants. STPP has stronger chelating ability and more stable binding with calcium and magnesium ions, making it suitable for hard water areas. SHMP offers more persistent dispersion effects but at a higher cost. The choice depends on raw materials, water quality and process conditions, determined through trials.

How to choose between FG-1003 and FG-N5?

FG-1003 has higher active ingredient content (56% vs 36%), offering stronger deflocculation, ideal for applications with extremely high slurry flowability requirements or difficult-to-disperse raw materials. FG-N5 offers better cost-performance for most conventional ceramic production.

What problems may occur with excessive STPP addition?

Excessive dosage may lead to over-deflocculation, abnormal thixotropy, and accelerated slurry settling. Additionally, excess STPP may affect body drying and firing performance. Determine optimal dosage through gradient trials,控制在 0.3%–0.5% range.

Does STPP affect slurry pH?

STPP is weakly alkaline and will slightly raise slurry pH after addition. The pH impact is generally within a controllable range, but if the slurry system is pH-sensitive, monitoring and fine adjustment is recommended.

Can free samples be provided for laboratory testing?

Yes. Goway provides free samples for laboratory formulation testing. Please contact our sales team with your formulation requirements and test objectives, and we will arrange shipment.

Request STPP Samples & Technical Support

Goway technical team can recommend the most suitable STPP grade and dosage based on your slurry formulation, water quality conditions and process requirements, and provide free samples and technical support.

📩 Contact Goway Sales / Technical Team

ISO9001 Certified · Reliable Ceramic Additive Supplier · Annual Capacity 30,000 MT

* Recommended dosages are typical reference ranges; final formulation requires laboratory verification.

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GOWAY INTERNATIONAL MATERIAL CO., LTD

Founded in 2009, we specialize in producing and supplying ,ceramic additives and related products, committing to supplying stable, environmentally friendly,professional and ceramic materials.

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E-mail：service@goway-china.com
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