HIDROX WOLLASTONITE (#150 AND #200)
Versatile, acicular wollastonite
Hidrox Namibia is a producer and supplier of high-grade acicular wollastonite, available for sale to the South African and Namibian markets in #150 and #200 product specifications. Our wollastonite is available in 50kg packaging, bulk bags (1.5 tons) or a combination of the two.
We are able to supply wollastonite to South African customers in all the major cities, including Johannesburg, Cape Town and Durban, with easy access to the major road networks. Our goal is to ensure that clients receive a high-quality product at an affordable price.
Please contact us directly for wollastonite stock availability, current lead time and pricing.
MINERALOGICAL COMPOSITION: Hidrox Wollastonite (#150 and #200)
CHEMICAL ANALYSIS (%):
SiO2: 49 - 53
CaO: 44 - 48
MgO: 0.45
Al2O3: < 0.3
Fe2O3: < 0.3
TiO2: Traces
MnO: < 0.05
K2O: 0.15
Na2O: < 0.03
Loss on Ignition: 1.5 – 3.0
Average Aspect Ratio: 1 : 6
Physical properties:
High brightness
Low moisture and an oil absorption
Low water solubility
High pH
Low volatile content
High melting point
Medium hardness (4.5 on Mohs’ scale)
Thermal stability
Uses of wollastonite
Wollastonite is often used in the manufacture of ceramics to improve many performance parameters due to its yield properties, release from volatile components, whiteness and acicular particle form.
In metallurgical applications, wollastonite is used to protect the surface of the molten metal during a flux for welding, a source of calcium oxide.
As an additive to paint, wollastonite increases the durability of the paint film, acts as a pH buffer, increases weather resistance, reduces gloss, reduces pigment consumption and acts as a smoothing and suspending agent.
In plastics, wollastonite increases tensile and bending strength, reduces resin consumption and increases thermal and dimensional stability at high temperatures. Surface treatments are used to improve adhesion between wollastonite and the polymers to which it is added. Wollastonite is a cost-effective replacement for fibreglass, milled carbon fibre and synthetic materials.
In the automotive industry, wollastonite improves the strength, dimensional stability and impact resistance of car parts, enabling manufacturers to make them lighter. It also boosts the scratch resistance of parts and improves weld line strength.
Instead of asbestos in floor tiles, friction products, insulation boards and panels, paint, plastic and roofing products, wollastonite is resistant to chemical attack, is stable at high temperatures and increases bending and tensile strength.