Welcome to Imerys Performance Additives Division

Glass fiber replacement

Glass fiber extension Imerys minerals make excellent glass fiber extenders in polyamides

Imerys wollastonites, micas, and talcs can be used in partial replacement of chopped glass fiber in polyamide compounds to reduce warpage and improve surface appearance, rheology and isotropy of mechanical properties.

Wollastonite

High aspect ratio wollastonite products improve thermo-mechanical properties in plastics, especially polyamides, and are excellent extenders for chopped glass fiber. 

High aspect ratio wollastonite can be used to replace one third of chopped glass fiber in polyamide formulations where it:

  • Maintains or even improves thermal and mechanical properties
  • Improves surface aesthetics due to less splay during injection molding
  • Reduces equipment abrasion, hence maintenance costs
  • Increases brightness and gloss
  • Maintains weldline strength (especially surface treated wollastonite)

Imerys wollastonites are cost-effective replacements for milled and chopped glass fibers in polyamides and other engineering alloys which need to meet UL-94 flame retardant (FR) properties.

We recommend our Nyglos® wollastonite for these applications.

Graph showing tensile strength comparison between GF and wollastonite
Tensile strength of PA6 filled with 10% wollastonite and 20% chopped glass fiber in comparison with 20% and 30% glass fiber filled PA6 in specimens with or without weldline

Talc

Platy talc minerals are good reinforcing additives that can be used for partial replacement of chopped glass fiber to:

  • Improve melt rheology
  • Increase stiffness and heat deflection temperatures
  • Reduce anisotropy—inherent in glass fiber filled formulations
  • Increase crystallization temperature, hence reducing injection molding cycle time

Depending on the application and performance required, our HAR®, Jetfine® or Mistron® talc products can be used for partial replacement of glass fiber in polyamide 6 and Polyamide 6,6.

They also provide cost-effective reinforcement solutions for recycled polyamides.

Graph showing tensile strength comparison between GF and talc
Talc improves crystallization temperature of PA6 filled with 10% talc and 20% chopped glass fiber in comparison with 20% and 30% glass fiber filled and neat PA6

Mica

Highly delaminated Imerys mica products are good reinforcing additives that can be used in partial replacement of glass fiber to maximize stiffness and improve isotropy while maintaining strength and toughness properties inherent to glass-fiber reinforcement.

Partial replacement of chopped glass fiber with mica in polyamides:

  • Improves flexural / tensile modulus
  • Maintains heat deflection temperature
  • Improves melt rheology
  • Reduces cross-flow shrinkage and anisotropy inherent in glass fiber filled formulations

We recommend our high aspect ratio Suzorite® mica products for the extension of chopped glass fiber in polyamide 6, polyamide 6,6, or recycled polyamide applications.

Graph showing tensile strength comparison between GF and mica
Tensile modulus of PA6 filled with 10% mica and 20% chopped glass fiber in comparison with 20% and 30% glass fiber filled PA6 in specimens with or without weldline

We offer a full range of bespoke formulation and technical and process support services to help you match the right mineral grade to your application requirement.

Please contact us, we will be only too happy to help

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Plastics