美国材料测试协会ASTM 标准 D11 - 橡胶和橡胶制品中工业级标准品--- IRM 021 硬脂酸（十八酸）标准品
有关背景：
Industry Reference Materials (IRMs), used for a number of test methods under the jurisdiction of ASTM Committee D11, are prepared according to ASTM D 4678, "Preparation, Testing, Acceptance and Documentation for Industry Reference Materials (IRM)". Refer to this for details not covered in this document. Candidate materials that are intended as IRMs are tested and accepted on the basis if (1) homogeneity of the lot and (2) an Accepted Reference-value or AR-value, for the appropriate properties for any IRM. The AR-value is the test value that should be obtained (within specified limits) for the selected one or more properties. AR-values are of two types: Global AR-values, obtained as an average (with specified 3 s limits) from an interlaboratory test program and Local AR-values, obtained as an average (with specified 3 s limits) for the laboratory involved with the preparation and testing.

如何评价IRM
This lot of sulfur is a Local AR-value IRM. International Sulfur, Inc. produced it in July 1998 and the blending of the material was done by Akron Dispersions Inc. Homogeneity testing was conducted via the procedures as outlined in ASTM D 4678 Annex A.3 on the basis of (%) oil content analysis, via ASTM D 4573-95, for eight individual samples taken from the beginning to end of the lot production. The lot was declared to be homogeneous using the procedure as outlined in Annex A.3. The Local AR-value for % of oil content as obtained from the homogeneity testing is given below. One secondary property, wet sieve testing, was deemed important and an analysis was conducted for wet sieve analysis (for #100 and #200 sieves) via ASTM D 4572-89, on a composite sulfur sample obtained by blending all individual homogeneity samples.

技术参数
酯溶性, %, (ASTM D 4573) +/- 3 s = 7.85 +/- 0.56
Wet Sieve (ASTM D 4572) (% through #100) +/- 1 s = 99.97 +/- 0.018
Wet Sieve (ASTM D 4572) (% through #200) +/- 1 s = 97.00 +/- 0.072
(The 3 s limits are based on 15 DF; 1 s limits are approximately 3 DF)

补充信息
处于干燥冷藏环境下保质期一般为5年。 可以通过ASTM官方网站查询保质期。

包装
IRM 031 Lot C标准硫黄粉(ASTM), 6000 克/听
1 听 包括 4 小包准 (1500 克/小包装)