Name: Wollastonite Fine Powder W-200
Brand: Coatingsink
SKU: wollastonite-fine-w200
Availability: InStock

Question 1

How does wollastonite's needle-shaped morphology benefit anti-corrosion primers?

Accepted Answer

Wollastonite's acicular (needle-shaped) particles with aspect ratios of 5:1–10:1 orient parallel to the substrate surface during film formation, creating a tortuous path that slows water and oxygen diffusion through the dry film — a key mechanism in corrosion inhibition. The needles also reinforce the coating film mechanically, improving chip resistance and adhesion. This makes wollastonite a useful partial replacement for crystalline silica in primers, with the added benefit of being non-hazardous and non-respirable at the particle sizes used.

Question 2

Can wollastonite replace talc in coil coating primers?

Accepted Answer

Wollastonite can partially replace talc in coil coating primers, offering similar anti-settling and reinforcement benefits but with the added corrosion-inhibiting effect from its alkaline pH (9.5–10.5) and calcium silicate chemistry. Direct replacement ratios depend on the specific formulation, but a 50% substitution is typically tested first, evaluating impact on gloss, flexibility (T-bend), and salt-spray performance. Wollastonite tends to increase primer porosity slightly, so pigment volume concentration and binder balance must be verified.

pH	9.5–10.5
Aspect Ratio	5:1–10:1 (needle-shaped)
Mohs Hardness	4.5–5.0
CaSiO3 Content	≥97%
Median Particle Size	8–15 µm

Wollastonite Fine Powder W-200

Specifications

FAQ

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