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:
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Ceramics:
Wollastonite is currently used in structural
clay products, such as bricks, sewer pipes, and
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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.
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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.
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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.
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Metallurgy:
As a natural low temperature fluxing mineral,
wollastonite is well-suited to metallurgical
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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.
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Plastics:
Wollastonite has proven to be an ideal additive
for enhancing the performance of fibre-reinforced
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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.
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Friction
Materials:
Wollastonite is finding growing acceptance as a
source of reinforcing fibres and fillers |
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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. |

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