Major Applications of Wollastonite

Wollastonite’s versatility and unique properties make it a mineral that is ideally suited to many different types of industrial applications. At present, the mineral is used in six main types of applications:

  Ceramics:  Wollastonite is currently used in structural clay products, such as bricks, sewer pipes, and
tiles; whiteware products, such as floor and wall tile and porcelain; and various kinds of advanced ceramics. The use of wollastonite in these products offers benefits such as enhanced mechanical reinforcement and strength, shorter drying times, reduced expansion during exposure to heat, and improved surface integrity and appearance.
 
  Construction Products: In the construction industry, wollastonite is finding growing acceptance in many
types of products, including concrete, mortar, sanitary pipes, wood composites, caulking and sealants, and calcium silicate board. In addition to providing improved strength and dimensional stability, the use of wollastonite in construction products has also been found to offer other important advantages such as improved weather resistance, greater resistance to mildew, and diminished vulnerability to surface and structural damage such as scratches, cracks, and mars.
 
  Paints and Coatings: Wollastonite has been used in many types of industrial and marine paints, as
well as in powder, architectural, and roof and underbody coatings. The benefits that result depend on the nature of the specific application, but some of the more common advantages the wollastonite offers include greater durability and corrosion resistance, improved film integrity and adhesion properties, increased resistance to cracking and chipping, better scrub and weather resistance, enhanced colour fastness, and reduced susceptibility to ultraviolet degradation.
 
  Metallurgy: As a natural low temperature fluxing mineral, wollastonite is well-suited to metallurgical
applications. Currently the most important of these applications are found within the steel industry, where the mineral has been found to be highly effective in enhancing continuous casting processes. Key benefits resulting from the use of wollastonite have included prevention of re-oxidization, improved lubrication, better absorption of non-metallic inclusions, and more uniform heat transfer.
 
  Plastics: Wollastonite has proven to be an ideal additive for enhancing the performance of fibre-reinforced
polymer composites and engineered plastics that are used in a wide variety of industries. When used in these products, the mineral serves to help improve dimensional stability, enhance strength and stiffness properties, reduce susceptibility to heat distortion and shrinkage, and provide improved surface quality and durability. In addition, wollastonite has also been shown to improve electrical insulation properties and in many cases has resulted in both attractive cost savings and greater scrap reduction.
 
  Friction Materials: Wollastonite is finding growing acceptance as a source of reinforcing fibres and fillers
in various types of friction materials. Increasingly, it is being used as a replacement for more traditional materials such as asbestos, chopped or milled glass fibres, or synthetic materials. Common applications include friction papers and vehicle components such as drum linings and disc pads. When used in these applications, benefits that result include improved physical and mechanical properties, reduced susceptibility to cracking, noise reduction, and in many cases, noticeable cost savings.

 

Canadian Wollastonite © 2008
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