RIGID PVC TUBE WITH AT LEAST THREE INTUMESCENT LAYERS AND FLAME RETARDER WITH MELAMINE

摘要

The invention relates to a rigid PVC tube having at least three layers, one of which is formed from a rigid PVC composition comprising melamine and / or a melamine derivative. The tube has improved fire resistance properties compared to an equivalent rigid PVC tube but lacking melamine and melamine derivative. The invention also relates to novel rigid PVC compositions comprising a selection of melamine derivatives.