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Fire resistance

Fire resistance Imerys minerals - cost-effective fire retardants and insulation additives

Imerys mica, and wollastonite are successfully used in many halogenated, halogen-free, and intumescent flame retardant (FR) formulations as FR synergists and/or for improving mechanical, thermal, rheological and aesthetic properties.

Imerys minerals in intumescent flame retardant PA 6

Imerys mica and wollastonite products show synergistic flame retardant (FR) performance allowing manufacturers to reduce FR additive loading or FR specimen thickness when used for partial replacement of chopped glass fiber (GF) in polyamide 6.  

Replacing 10% of glass fiber with any of the above minerals improves rheology of the 30% GF-filled FR PA which is a known weakness of glass fiber reinforced PA6. 

For example, partial replacement of GF with high aspect ratio talc or mica allows compounders to achieve UL94 V0 or V1 rating at decreased loading levels of organic phosphinate-based intumescent FR additives in a 30% GF-filled polyamide 6 formulation at 1/8” or 1/16” specimen thickness.

We recommend our Suzorite® mica, and the surface treated Nyglos® wollastonite line of products for GF replacement in intumescent FR formulations of PA6

Mica for APP replacement

Imerys mica grades make cost-effective replacements for ammonium polyphosphate (APP) commonly used to meet UL94 V0 requirements in halogen-free flame retardant formulations for polyolefins.

APP is not only expensive it also diminishes physical properties such as tensile strength.

Imerys micas can be used as a synergist to replace up to one third of APP flame retardants where they:

  • Boost flexural modulus
  • Improve HDT
  • Reduce shrinkage and warping
  • Promote char formation

We recommend our Suzorite® range for APP replacement in polyolefins.

We offer a full range of custom 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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