CP-EWS Water-Based Organoclay — High-Performance Aqueous Rheology Modifier

Q: What is the difference between CP-EWS and CP-EW?

CP-EWS is an improved grade over CP-EW with three key enhancements: higher thixotropy (stronger gel structure at equivalent dosage), better gel transparency (clearer, more colorless gel in water), and improved dispersion (faster hydration, more uniform gel). CP-EWS also carries a defined viscosity specification (≥3000 mPa·s at 3% in water) that provides a measurable quality benchmark. CP-EWS additionally covers ceramics applications that CP-EW does not. Both grades are used at 0.2–3.0% in water at pH 7.0–8.0 with direct powder addition.

Q: What is CP-EWS used for in ceramics?

In ceramics applications, CP-EWS is used as a suspension agent and rheology modifier in ceramic slips and glazes — preventing settling of ceramic particles in aqueous suspension during storage and application. Its thixotropic gel structure keeps ceramic particles uniformly suspended at rest while allowing the slip to flow during spraying or dipping application. CP-EWS is also used in casting slips to control flow during mold filling.

Q: What viscosity does CP-EWS achieve in water?

CP-EWS achieves a minimum viscosity of 3000 mPa·s at 3% concentration in water (measured at 25°C with Brookfield viscometer). This viscosity specification provides a quality benchmark for batch-to-batch consistency. Higher concentrations (5–8%) can achieve viscosities of 8,000–15,000 mPa·s depending on pH, water quality, and shear history. Optimal gel development occurs at pH 7.0–8.0.

CP-EWS is an advanced water-dispersible organoclay providing superior performance over standard water-based grades. The additional processing in CP-EWS manufacturing yields faster hydration, higher thixotropic index, and greater gel transparency in aqueous systems. A defined viscosity specification (≥3,000 mPa·s at 3% in water) ensures measurable, consistent performance across production batches. CP-EWS expands the application range to ceramics slip and glaze formulations in addition to the standard waterborne coating, cosmetic, and sealant applications.

Technical Properties

Parameter	Specification	Test Method
Chemical composition	Inorganic modified montmorillonite clay	—
Appearance	Fine powder, white	Visual
Moisture content	≤ 10%	105°C, 2 hours
Bulk density	0.40–0.60 g/cm³	—
Viscosity (3% in water, 25°C)	≥ 3,000 mPa·s	Brookfield viscometer
Fineness	≥ 95% passing 74 μm (200 mesh)	Sieve analysis
Optimal pH range	7.0–8.0	—

Performance Advantages vs CP-EW

Property	CP-EWS	CP-EW
Thixotropy	Higher — stronger gel structure	Standard
Gel transparency	Better — clearer, more colorless	Good
Dispersion speed	Faster hydration	Standard
Viscosity specification	≥3,000 mPa·s at 3% (defined spec)	Not specified
Ceramics application	Yes — ceramic slips and glazes	Not listed
Addition level	0.2–3.0%	0.2–3.0%

Applications and Dosage

Application	Typical Dosage	Key Function
Waterborne industrial paint	0.5–1.5 wt%	Anti-settling, anti-sagging, thixotropy
Emulsion (latex) paint	0.3–1.0 wt%	Anti-settling, storage stability
Water-borne antiseptic coatings	0.5–1.5 wt%	Pigment suspension, anti-sag
Toothpaste and tooth polish	1.0–3.0 wt%	Thickening, abrasive suspension
Cream and lotion (cosmetics)	0.5–2.0 wt%	Suspension, texture, thickening
Water-borne sealant / adhesive	0.5–2.0 wt%	Non-sag, extrusion profile
Ceramics slip and glaze	0.3–1.5 wt%	Particle suspension, flow control
Pigment blunge water	0.2–0.8 wt%	Pigment suspension

Ceramics Application: CP-EWS prevents ceramic particle settling in aqueous slips during storage between production cycles — maintaining uniform pigment and filler distribution. The thixotropic gel allows the slip to flow during spraying or dipping application while holding particles in suspension at rest. This eliminates the need for manual re-stirring of settled slips and improves consistency of the final glazed surface.

Incorporation Procedure

Prepare water phase at pH 7.0–8.0 — adjust if needed; pH outside this range reduces gel performance
Add CP-EWS powder directly to water at 0.2–3.0% of total formulation
Disperse at high speed for 20–30 minutes — high-shear disperser or dissolver
Add additives (biocides, dispersants, wetting agents)
Add pigments and fillers; mix thoroughly
Add emulsion or binder last; mix gently
Post-correct viscosity if needed

Frequently Asked Questions

What is the difference between CP-EWS and CP-EW?

CP-EWS is an improved grade with higher thixotropy, better gel transparency, faster dispersion, and a defined viscosity specification (≥3,000 mPa·s at 3%). CP-EWS also covers ceramics applications. Both grades use direct powder addition at 0.2–3.0% in water at pH 7.0–8.0. Choose CP-EWS for specification-critical applications or when higher performance at equivalent dosage is required. CP-EW details →

What is CP-EWS used for in ceramics?

In ceramics, CP-EWS prevents settling in ceramic slips and glazes during storage, controls flow during spray or dip application, and improves glaze consistency. The thixotropic gel structure holds ceramic particles uniformly at rest but flows under application shear. Used at 0.3–1.5% in aqueous ceramic slips.

What viscosity does CP-EWS achieve in water?

CP-EWS achieves minimum 3,000 mPa·s at 3% in water at 25°C (Brookfield viscometer). Higher concentrations (5–8%) achieve 8,000–15,000 mPa·s depending on pH and water quality. Optimal performance at pH 7.0–8.0. For higher viscosity requirements, use CP-WBS (10,000–13,000 mPa·s at 10%).

Packaging and Storage

Parameter	Specification
Standard packaging	25 kg kraft paper bags with PE inner liner
Shelf life	2 years from manufacture date
Storage conditions	Cool, dry warehouse; protect from moisture — water-based grades absorb ambient moisture more readily

Related grades: CP-EW (standard water-based grade) · CP-WBS (highest viscosity water-based grade)

Related applications: Waterborne Coatings · Cosmetics · Water Treatment

CP-EWS Water-Based Organoclay — Technical Data Sheet