Building Materials Flammability Tester NF P92-505 Melt Dripping Test Apparatus
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NF P92-505 Dripping Test Apparatus
Product introduction The dripping test according to NF P 92-505 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, produced by a heating source, were
noticed during the main test. This one can be either the electrical
burner test for flexible and thin materials (NF P 92-503), or the
radiation test (epiradiator cabinet) for rigid or flexible and
thick materials (NF P 92-501). Principle In principle, cotton wool inflammation at the dripping test leads
to M4 classification. If the cotton wool is not inflamed at the
dripping test, the classification obtained at the main test is
maintained or the material is downgraded according to whether there
was some uninflamed or inflamed dripping during this same main
test. In case of holing without inflammation or with short time
inflammation at the main test, this outline is also applied to the
complementary flame persistency test (NF P 92-504) when there was
again some uninflamed or inflamed dripping during this
complementary test.
Product Features The dripping test apparatus comprises the following elements put together on a common base : At the upper part of the first stand is placed the epiradiator-type heat radiation source of 500 W power rating, which radiant surface is made of a translucent vitreous fused silica disk of 100 mm diameter. A movable handle device allows to slightly lift up the epiradiator support to rotate at 90° in the horizontal plane, in order to remove it from the test piece. The second stand bears an adjustable in height assembly with at the upper part the test piece support and at the lower part the drop receptacle, these two parts being 300 mm apart. The test piece support is made of a metal ring on which lies a plane circular grid in stainless steel wire. The drop receptacle is composed of a small dish which flat bottom is entirely covered by cotton wool. A guiding mark bound up with the epiradiator support and a graduated metal rule fixed to the pole of this second stand allow to adjust the distance between the radiant surface of the epiradiator and the upper face of the test piece.
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