IGNITABILITY TEST OF MATERIALS AND PRODUCTS WITH METHODS ACCORDING TO DIN 53438 PART 2 AND DIN 53438 PART 3.
Principle of the method.
The test are being conducted in the ventilating chamber. The sample, upright, is being subjected to the effect of the gas burner flame about the flame height of 20 mm.
Stand for testing the ignitability of materials
The flame application time on the sample - for 15 s. After this time are being moved away burner.
Tests may need to be conducted to either surface exposure or edge exposure, or both.
For each of the test specimens, record the following:
- whether ignition occurs;
- duration of flaming,
- length of the proliferation of the flame,
- whether the flame tip reaches 150mm above the flame application point, and the time at which this occurs;
- presence of flaming droplets/particles which cause ignition of the filter paper;
- observations of physical behaviour of the test specimen.
For each exposure condition, a minimum of six representative specimens of the product shall be tested. Three specimens shall be cut lengthwise and three crosswise.
Dimensions of the test specimens.
for surface exposure
- 190 mm long
- 90 mm wide
for edge exposure
- 230 mm long
- 90 mm wide.
Specimens normally having a thickness of 60mm or less shall be tested using their full thickness. Specimens normally having a thickness greater than 60mm shall be reduced to a thickness of 60mm by cutting away the unexposed surface. If it is necessary to reduce the specimen size in this manner, the cut surface shall not be exposed to the flame. For materials which exhibit different characteristics along or across the direction of manufacture (e.g. coated fabrics, textiles), one single test shall be carried out along and another test across this direction.
Applying research methods - civil engineering (requirements according to DIN 4102 part 1 for class B2).