FEATURES THE TESTING OF AVIATION MATERIALS ON FIRE SAFETY. Part 1. Test on flammability — influence of sample thickness on registered characteristics

According to requirements of aviation norms, tests for definition characteristics of flammability under the influence of open flame samples of materials for all used thickness are subject. For the purpose of tests volume reduction, foreign researchers have makes the decision that “Data from testing a thinner construction substantiates a thicker construction made of the same materials”. Researches on influence of sample thickness of polymeric composite materials and core panels on their basis on flammability characteristics (burn-out length, duration of residual independent burning) according to requirements of aviation norms are conducted. In this article the characteristics of flammability for different types polymeric materials of aviation assignment (glass-, organ- and carbon reinforced plastics, core panels) were analyzed. The obtained experimental data show that the accepted assumption is carried out for burn-out length, but not always operates for the characteristic of duration of residual burning. It is offered at performance of qualification tests on flammability to use the standard number of thickness similar to applied at definition the smoke and heat release characteristics.