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Mica and Wollastonite Fillers in Injection Molding

Mica and Wollastonite Fillers in Injection Molding

Mica platelets can stiffen compounds and influence warp in preferred directions.

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Mica and Wollastonite Fillers in Injection Molding

Plate and needle mineral fills

Mica and wollastonite change shrink and surface differently from talc powder.

Mica platelets can stiffen compounds and influence warp in preferred directions.

Pearl-gray mica-filled cosmetic housings on a light gray studio surface.

Wollastonite needles act like short mineral fibers for modulus with different surface feel than talc.

Use supplier grades rather than blending raw mineral unless your compounder qualifies the mix.

When to specify it

Specialty mineral checklist

Use this on RFQs and BOMs before you lock a filled grade.

  • Write mica or wollastonite suffix.

  • Note flat vs ribbed geometry.

  • Cosmetic vs structural split.

  • Compare to talc-filled alternative.

Trade-offs

Mica vs wollastonite

Qualitative matrix. Confirm numbers on the supplier datasheet.

FillEffectWatch for
MicaStiffness, plate orientationDirectional properties
WollastoniteModulus boostSurface texture
TalcCost, warp on flatsImpact drop

Routing

Mineral family pick

Match morphology to part geometry.

Talc filled PP

  • Large flats
  • Low cost
  • Hinge zones unfilled

Mica filled nylon

  • Dimensional stability focus
  • Supplier specific
  • Validate T1

RFQ

What to write on the purchase order

Clear resin callouts reduce quote iterations and T1 surprises.

  1. 1

    Use commercial grade

    Do not specify raw mica percent without compounder.

  2. 2

    Link mineral cost article

    Talc context.

  3. 3

    T1 CMM on flats

    Check directional shrink.

  4. 4

    SPI finish

    Mineral can affect gloss.

FAQ

FAQ

Mica and food contact?

Supplier grades only.

Same mold from talc to mica?

Unlikely without validation.

Wollastonite vs glass?

Different cost and load; compare on T1.

Related guides

Materials, comparisons, and risks

Internal links only render in cards and CTA blocks.

Next step

Get a quote with your resin specified

Upload CAD and list fill level, color, and flame filter on the instant quote platform.

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Mica and Wollastonite Fillers in Injection Molding | NetProto