Fire resistance Imerys minerals act in synergy with flame retardant fillers and additives
Acting in synergy with flame retardant fillers and additives, Imerys minerals create a physical barrier to fire, reducing combustion rate, improving char strength and decreasing smoke quantity and rate of emission.
With MDH and ATH in EVA rubber sheathing
Hydrous kaolin is effective as a partial replacement for magnesium hydroxide (MDH) and aluminum tri-hydrates (ATH), reducing compound costs without affecting fire retardant properties.
Hydrous kaolin such as Hydrite® SB100 creates a mass transfer barrier restricting the transfer of combustible materials and oxygen and imparting a cohesive foam structure to the polymer.
Imerys hydrous kaolins can:
- Limit burnable gas emissions and oxygen diffusion by foaming effect, resulting in delayed combustion
- Create a physical barrier effect limiting heat and mass transfer
- Are excellent char promoters
- Improve ash cohesion
- Generate less smoke
FR wire and cable
Imerys hydrous clay is a suitable char promoter in FR wire and cables.
Calcined clay is an excellent solution for improving insulation, dielectric properties and the dissipation factor in wire and cable applications.
- Polestar® imparts excellent electrical insulation properties to low and medium voltage power cables
- Polarite® has been specifically developed for use in high and very high voltage power cable insulations based on EPR and EPDM rubbers
- Suprex™ and Hydrite® are highly recommended for char promotion in FR cables
Hyper platy kaolin Clay
For more stringent requirements, Imerys hyperplaty kaolin clay Hydrite® SB100 and Hydrite® SB60 provides an outstanding intumescent effect, which retards fire ignition and protects the EVA from combustion.
This intumescence is mainly due to the conjunction of heterogeneous bubble nucleation, barrier effect, increased viscosity and char promotion.
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.