Overview
White clay for coatings is a refined kaolin product engineered for paint and coating applications. As a naturally occurring aluminosilicate mineral, it serves as a functional extender and opacifier in formulations. Industrial users value its consistent quality, which is achieved through beneficiation processes like washing, drying, and micronization. The material meets strict specifications for brightness (typically 85-92 ISO) and particle size distribution to ensure optimal performance in coating systems.
Physical and Chemical Properties
This specialty clay exhibits a plate-like particle structure that enhances coating rheology and film strength. Its pH-neutral character (6.0-8.0) makes it compatible with most binder systems. Key technical parameters include controlled oil absorption (30-50 g/100g) and low volatile content (<0.5%). The material's refractive index (1.56) contributes to hiding power, while its chemical inertness prevents interactions with other formulation components.
Main Applications
In water-based paints, the clay improves sag resistance and brushability. For solvent-borne systems, it assists in pigment dispersion and reduces settling. Architectural coatings represent the largest application segment, where the clay enhances scrub resistance and tint acceptance. Industrial coatings utilize its matting effects, while powder coatings benefit from its flow control properties. Specialty applications include textured finishes and corrosion-resistant primers.
Safety and Storage
As a non-hazardous material, it requires standard industrial hygiene practices. Bulk storage should prevent moisture absorption that could cause caking. Packaging typically includes multi-layer paper bags with polyethylene liners (25kg) or bulk super sacks (1,000kg). Shelf life exceeds 24 months when stored properly. MSDS documentation should be reviewed for specific handling guidelines regarding dust exposure limits.
B2B Procurement Guide
Technical specifications should address brightness (ISO 2470), particle size (laser diffraction), and residue on 325 mesh. Request certificates of analysis for lot-to-lot consistency. Suppliers often provide technical support for formulation optimization. Consider regional availability to minimize logistics costs, as this medium-density powder incurs significant freight expenses. Sample testing is recommended to verify performance in specific systems before large-scale procurement.
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