Determination of thermal stability
1. Test facilities and auxiliary devices:
a) temperature Chamber (drying Cabinet) , which provides temperature maintenance up to 200 °C;
b) thermometer for measuring air temperature up to 200 °C with a division of 1 °C;
c) metal line according to GOST 427;
f) glass plate;
2. The test shall be carried out on three samples (220±5) mm long.
3. Before testing, the temperature chamber is heated to (150±3) °C.
4. The test procedure:
the Sample placed horizontally on a glass plate previously dusted with talc and placed in a chamber, which was incubated for (30±1) min, Then the sample is removed, cooled in air to room temperature and inspected.
5. Processing results:
the Sample is considered to have passed the test, if there is no damage on its outer surfaces, and on the end surface – bundles and shells.
the test Result shall be considered satisfactory if all three samples have passed the test.