WP-210
White Ceramic Microspheres

The white appearance of WP-210 is a direct result of its ultra-low iron oxide content (Fe₂O₃ < 0.5%). Iron compounds are responsible for the grey/brown tinting seen in standard ceramic microspheres and raw fly ash. By sourcing and processing from low-iron raw materials — and applying additional iron-removal steps — WP-210 achieves a colour-neutral, bright-white filler suitable for:

• White and pastel architectural paints where off-white fillers shift L* and b* values
• White powder coatings and appliance finishes where tinting causes visual rejection
• White polymer compounds and masterbatch where the filler base must not grey-down the pigment system

Yes — and this is one of the most commercially significant benefits for paint formulators. WP-210's fine particle size (D50=10µm) and narrow size distribution allow it to act as a TiO₂ spacer. When TiO₂ particles are spaced optimally (avoiding particle crowding), each particle scatters light more efficiently. By using WP-210 to achieve this spacing, formulators typically reduce TiO₂ loadings by 10–20% while maintaining equivalent dry hiding power. At current TiO₂ prices, this can represent a meaningful cost-in-use reduction per litre of paint.

WP-210, talc, and kaolin all serve as white functional fillers, but differ significantly in particle geometry and resulting performance:

• Sphericity: WP-210 is >90% true spheres; talc and kaolin are platy/lamellar — this gives WP-210 much lower oil absorption (22–32 vs 50–80+ for kaolin).
• Hardness: WP-210 is harder (Mohs 5.5–6.5 vs kaolin 2–2.5, talc 1) — conferring better scrub and abrasion resistance.
• Rheology: Spheres act as micro ball-bearings and reduce formulation viscosity; platy fillers typically increase it.
• Pricing: WP-210 carries a premium vs commodity talc and kaolin — the cost delta is offset by performance gains and TiO₂ savings in demanding formulations.

Yes — WP-210 is well-suited to exterior architectural coatings. Its thermal stability above 1000°C, chemical inertness, and spherical morphology all contribute to durable, weather-resistant coatings. The low iron content means no iron-induced photocatalytic degradation that can yellow or grey-down exterior white finishes over time. WP-210 is used successfully in exterior emulsions, elastomeric coatings, and textured renders.

WP-210 is available in untreated form as standard. Surface-treated grades (silane-treated for polymer compatibility, stearate-treated for hydrophobicity, or custom coupling agents for specific resin systems) can be produced to minimum order quantities. Please contact our technical team to discuss the optimal surface chemistry for your application.

Standard MOQ is 500 kg (20 × 25 kg bags). Trial quantities from 25 kg are available for qualified customers. Lead time is typically 7–14 business days from order confirmation. Bulk orders (>10 MT) may have extended lead times — please enquire. Sample requests (1–5 kg) are dispatched within 2–3 business days.