Fire Resistant Wire & Cable Imerys minerals - excellent insulators for FR wire & cable applications
Imerys talcs and micas act in synergy with flame retardant fillers and additives, creating a physical barrier to fire, reducing combustion rate, improving char strength and decreasing smoke quantity and rate of emission.
Talc in EVA
Talc's hydrophobic and electrically neutral platelets make it an ideal insulator for EVA wire and cables. It also works in synergy with metal hydrates for outstanding fire resistance.
- Limits burnable gas emissions and oxygen diffusion by foaming effect, resulting in delayed combustion
- Creates a physical barrier effect limiting heat and mass transfer
- Is an excellent char promoter
- Improves ash cohesion
- Generates less smoke
- Is a natural, environmentally friendly solution
Imerys talcs can be also be used as a partial replacement of magnesium hydroxide (MDH) and aluminum tri-hydrates (ATH) reducing compound costs without affecting fire retardant properties.
For more stringent requirements, Imerys High Aspect Ratio Mistron HAR® talc provides an outstanding intumescent effect which retards fire ignition and protects the EVA from combustion.
Talc in cable sheathing
In cable sheathing applications, Imerys talcs also improve a host of other parameter such as:
- Abrasion resistance in heavy-duty cables
- Fluid resistance for cables in contact with water
- Compound extrudability
- Surface finishing
Talc is also an ideal carbon black extender and internal lubricant reducing the viscosity of compounds.
Imerys micas are excellent flame retardant extenders, especially in phosphate derivative retardant systems such as ammonium phosphate (APP), a halogen-free flame retardant (FR) system for polyolefins.
We recommend our Suzorite® range for this application.
Meet new CPD directives with Imerys minerals
Using Imerys minerals in rubber compounds for cable sheath and conductor insulation is the most cost-effective way of meeting 2012 Euroclass legislation under the EU's Construction Products Directive.
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.