Wollastonite in Plastic Extrusion

Using wollastonite to increase rigidity, insulation and thermal resistance in compound

Wollastonite is a natural mineral filler based on calcium silicate, with an acicular structure and reinforcing properties. Its high elastic modulus, thermal stability and compatibility with various polymer matrices make it ideal for technical compounds.
Thanks to its needle-like morphology (high aspect ratio), wollastonite improves rigidity, insulation and heat resistance. It is available in various particle sizes and surface treatments (e.g. silanes) to improve adhesion to the polymer matrix. Impurity content is reduced through magnetic separation and flotation, ensuring high purity.
Bausano does not supply wollastonite or other fillers, but designs extrusion lines capable of handling filled materials with precision, stability and dispersion control.

Applying wollastonite in technical sectors requiring dimensional stability and mechanical strength

The use of wollastonite is recommended for compounds intended for applications requiring geometric precision, thermal stability and mechanical strength. Thanks to its low coefficient of expansion, it is ideal for components subject to thermal cycling or structural stress. It is used in:

Automotive, for lightweight, insulating and dimensionally stable structural parts
Construction, in profiles and surfaces resistant to moisture and thermal variations
Electronics, to improve electrical insulation and resistance to deformation
Industrial equipment, where combined resistance to heat, wear and chemicals is required

The ability to adjust aspect ratio, fiber length and surface treatments allows for extensive formulation customization.

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Optimizing compound performance by improving structure, thermal behavior and surface finish

Adding wollastonite significantly improves the compound's functional properties. Key benefits include:

Increased rigidity and elastic modulus
Reduced thermal deformation and improved dimensional stability
More uniform surface finish, thanks to the fiber structure
Partial barrier effect against gas and moisture
Compatibility with thermoplastic and thermoset resins, also thanks to surface treatments

Compared to more abrasive reinforcing agents, wollastonite causes reduced wear on the line's mechanical components, contributing to plant durability.

Extruding compounds with wollastonite while ensuring uniform dispersion and process protection

Processing wollastonite, particularly high aspect ratio (HAR) versions, requires optimized screw configurations to preserve filler integrity and ensure compound homogeneity. Bausano solutions – both single-screw and co-rotating twin-screw – ensure control over torque, shear and thermal profile.
Thanks to screw geometry, it is possible to prevent breakage of longer fibers and achieve a consistent distribution of the reinforcing agent. Bausano systems are compatible with micronized, treated or natural wollastonite, adapting to different production needs and application sectors.
Bausano supports clients from the testing phase through to line start-up, helping to identify the ideal conditions for processing filled compounds with precision, continuity and reduced machine downtime.

A starting point to define the right solution together

By filling in the form below, it is possible to describe specific technical or production requirements. The technical team will carefully evaluate the request in order to propose the most suitable extrusion line or extruder.