Abstract
The use of layered double hydroxide (LDH) derivatives as flame retardants for PVC, plasticized with 100 phr diisononyl phthalate (DINP), was investigated. Cone calorimeter results, obtained at a radiant flux of 35 kW m−2, revealed that adding 30 phr conventional magnesium‐aluminium LDH lowered the peak heat release (pHRR) rate from 623 ± 8 kW m−2 to 389 ± 9 kW m−2 and reduced the smoke release by 37 %. Partial replacement of the aluminium with iron resulted in a red pigmented additive that was more effective as a flame retardant reducing the pHRR to as little as 253 ± 5 kW m−2. This additive also showed better smoke suppression (44 % lower) but the best smoke suppression was achieved by replacing part of the magnesium with copper (49 % lower).
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