NF P 92-505 test is a reaction to fire complementary test for M classification of building and fitting materials. It is used for thermalmelting materials for which some inflamed or not dripping, were noticed during the main test (electrical burner test or epiradiator cabinet) or even during the complementary flame persistency test.
This test allows to maintain or to lower the classification obtained at the main test or at the complementary flame persistency test.