The inorganic PIN flame retardant aluminium trihydrate (ATH) was tested in EPDM (ethylene propylene diene monomer – 70%) – LDPE (low density polyethylene – 30%) composite. Such crosslinked thermoplastic elastomer combinations offer performance properties including process/design flexibility, strength, light weight and elasticity, and are increasingly used in a range of applications where fire safety is important, including artificial rubber, insulation, sealings and pipes, electrical and electronics, automobile and aircraft. Effects of six different loadings of ATH (from zero to 56%) in 2 mm EPDM-LDPE sheets were assessed on performance characteristics (rheometric, tensile, hardness, dynamic mechanical, electrical, thermogravimetric) and on fire performance (heat release, time to ignition, smoke release). ATH showed to reduce peak heat release (PHR) by nearly three, to increase time to ignition by nearly three and to reduce total smoke release to below 31% of smoke release from the composite without flame retardant.
“Effect of aluminum trihydrate as flame retardant on properties of a thermoplastic rubber nanocomposite”, M. A. Khattab et al., Fire and Materials, 2017; 41:688–699 http://dx.doi.org/10.1002/fam.2411