The flame retardant for polypropylene using magnesium hydroxide with intumescent components

In this work we present results: of our study on flammability of polypropyl ene samples containing various fire retardants. Moreover, the influence of the flame retardants added to PP on the structure of polypropylene matrix w as investigated. The effect of magnesium hydroxide on thermal properties of isotactic polypr opylene was measured on a cone calorimeter. The measurements were performed in air at heat flux of 50kW/m(2) Melamine polyphosphate, when added to MagShield-PP system, shows the highes t fire-retarding effect compared to other intumescent compounds studied, su ch as pentarrythritol, urea polyphosphate and zinc berate. The weakest effe ct was recorded for zinc borate-containing composite. Results of the structural study allow to conclude that fire retardants base d on magnesium compounds in practice do not change the crystalline structur e of isotactic polypropylene. The intumescent fire retardants act as nucleants of hexagonal form of isota ctic polypropylene.