Downloaded from https://www.everyspec.com MIL-STD-2031 (SH) Unusual roxici~: A property of a material whose combustion product toxicity can not be explained by the quantity of known, major toxic gases present .4l[toi,rnition [cmpcrolurc: The lowest furnace tcmpcra[urc at which a material sampk minutes. introduced into the [est furnace will spontaneously ignite within M 40, PROCEDURE 40.1 he-test and test conditions. AU tests shall be conducted in a room or enclosed space having an ambient temperature of 22 A 3 (70 & 5 and relative humidity of 50 & 10 percent at the time of test. 40.1.1 CAUTION:
Provision shall be made for removing combustion products from the exposure chamber without contaminating the work area and exposing the test operators. The exposure chamber shall be housed in a chemical hood or other ventilated enclosure. 40.1.2 Inside exposure chamber. Inside exposure chamber wall surfaces shall be cleaned when changing the test material; changing temperature of decomposition; following test runs where toxicologically significant combustion products are suspected of accumulating as particulales; or, as visual inspection may indicate. 40.13 Pm-experiment check.
Prior to experiments involving the actual test material, the system shall be checked to determine that the analytical and combustion systems arc operating correctly. To check the entire system, a standard material shall be run. Douglas fir (4.5 g for non- flaming and 7.1 g for flaming combustion) conditioned fin 48 hours at 22 * 3 (70 & 5 and relative humidity of 50 * 10 pereent shatl be used. The LC50 data from 7 laboratory for the 30 minute exposure and 14 day post-exposure observation period is shown in Table IL An NIST Standard Referenee Material may be availab!e for use in the future.
If the LC50 results for the non-flaming and flaming decomposition of Douglas fir conditions fall within the 95 pereent confidence limits of the mean of these laboratories, the performance of the system is considered acceptable. . 41