ASTM D3934 for flash/no flash test-equilibrium method by a closed-cup apparatus
8. Preparation of Sample
8.1 Obtain a representative sample of the product under test and keep it in an air-tight container.
8.2 Because of the possibility of loss of volatiles, the sample shall receive only the minimum treatment to assure uniformity. After removal of the specimen, immediately close the sample container tightly to ensure that no volatile flammable components escape from the container (otherwise a new sample may be necessary if further testing is required).
8.3 Do not open containers unnecessarily. Do not make transfers unless the sample temperature is at least 20°F (10°C) below the flash point.
8.4 Discard samples in leaky containers.
8.5 Do not store samples in plastic (polyethylene, polypropylene, etc.), since volatile material may diffuse through the walls of the bottles.
9. Preparation of Apparatus
9.1 Support the cup and liquid bath on a level, steady table. Unless tests are made in a draft-free room or compartment, surround the tester on three sides with the shield for protection from drafts. Tests made in a laboratory draft hood or near ventilation are not reliable.
9.2 Adjust the temperature of the bath to, and maintain it within 1.0°F (0.5°C) of the specified test temperature, correcting this temperature for any difference from standard barometric pressure by raising the test temperature for a higher pressure or lowering it for a lower pressure.
9.3 Carefully clean and dry the test cup, the cover, and the cup thermometer and bring them to at least 4°F (2°C) below the minimum specified test temperature.
