Downloaded from https://www.everyspec.com MIL-STD-2031 (SH) TABLE II. Interlaboramty evaluation of doughs fi LC50 (30 minutes + 14 days). 2 1 27.6(22.9 - 33.3) 16.7( 14.5 - 19.3) 45.339.0 - S2.7) 35.8(28.6 44.9) 4 5 NIST1 NIST2 8 3 26.8(21.3 - 33.7) 24.q 19.9- 29.(J) 28. 29.q227 - 38.6) 38.4(35.2 - 41.9) J 25.9(20.0 - 33.5) 20.4( 16.4 - 2$.3) 4 1.0(33.0 - 50.9) 22.8(20.2 - 25.8) 183( 173- 19X) 39.438.2- 41 29.8(23.9 - 37.1) Mean = 95 percent confidence limits 36.q21.l - 50.8) 228(13.4 - 322) ‘NET small rurnace. 2NIST largefurnace. 3Estimatcd. In this table, the numbers quoted me 95 percent confidence limits are as calculated from the data provided by various laboratories.
refleet only statistical variations. The instruments for COT, CO, and HCN measurements shall be zmroed and a base line established during the cheek-out p-%xdure. Oxygen concentration shall be reuordcd prior -to initiating the exposure. 40.1.4 Cheek-out Ptilll’t!. 40.14 “Wttrm@p, The fkwwue ‘$htt!l‘be bw)u@t UP’tIO’t!Wtkil~” HY@rtiture ttnl’the _ alkwmd to reach equilibrium 10 minutes before the start of the experiment. Durfng this warm- up period and the recording of pre-exposure data, the door of the exposure chamber shall be left open. 40.2 Test materials.
Material samples to be evaluated for toxicity shall be conditioned in a constant humidity chamber maintaind at 50 & 10 pereent relative humidity at a mom temperature of 22 & 3 (70 & 5 for a period of 48 hours prior to testing. 40.2.1 Sizing of sample. The size of the test specimen for the initial test shall vary depending on the expeeted toxicity of its combustion products. A reasonable initial loading for an unknown material is about 5 grams. For example, 5 grams of material thermally degraded Icads to a concentration of combustion products of 2S mg/L (grams of material loaded/chamber volume).
Based on the results of the initial test, sample sizes for subsequent teats shall be scketed to provide suflkient information to predict the LCM concentration. Prior to the start of the experiment, the weight of the beaker and sample material shall be reeorded. 42