Wollastonite is a high-performance mineral filler widely used in plastic compounding. Known for its unique needle-like structure and reinforcing properties, wollastonite enhances the strength, dimensional stability, and thermal performance of plastic products across multiple industries.
At Hippo Minerals, we supply quality wollastonite to manufacturers and compounders across South Africa. Whether you're producing automotive parts, consumer goods, or technical components, wollastonite offers a cost-effective way to improve product performance.
Wollastonite acts as a reinforcing agent in thermoplastics and thermosets due to its high aspect ratio. When dispersed in the plastic matrix, it improves:
Rigidity and tensile strength
Dimensional stability under heat
Creep resistance and load-bearing capacity
This makes it ideal for parts that must maintain shape and strength under stress, such as automotive interiors, electrical housings, and appliance casings.
One of wollastonite’s standout features is its ability to enhance a compound’s thermal deflection temperature. Plastics filled with wollastonite show:
Improved heat resistance
Lower thermal expansion
Better performance in high-temperature environments
This benefit is especially valuable in under-the-hood automotive parts and electrical applications where heat exposure is a concern.
Due to its fibrous structure, wollastonite helps reduce shrinkage during moulding and cooling, which leads to:
Fewer defects in injection moulded parts
Better dimensional consistency
Reduced scrap and rework costs
This is essential for manufacturers that need tight tolerances and minimal post-processing.
Wollastonite can partially or fully replace glass fibre in certain applications. While not as strong in absolute terms, it offers:
Easier processing and lower tool wear
Smoother surface finishes
Lower raw material costs
Non-abrasive and less dusty handling
For many medium-duty plastic parts, wollastonite is a more economical and cleaner option.
Compared to some other fillers, wollastonite contributes to:
Better surface smoothness
Improved paint adhesion
Minimal pigment interference
This is important in cosmetic parts where visual quality and uniform finishes matter.
Wollastonite is used in a wide range of plastic and polymer compounds, including:
Polypropylene (PP)
Polyamide (PA/Nylon)
Polyester (PET/PBT)
Thermosets (epoxy, phenolic)
End-use products include:
Automotive interior panels
Electrical connectors
Industrial components
Appliance parts
