A2.1 Certified Reference Material (CRM) - CRM is a stable, pure (99 + more % purity) hydrocarbon or other stable petroleum product with a method-specific flash point established by a method-specific interlaboratory study following RR:D02-1007 guidelines or ISO Guide 34 and 35.
A2.1.1 Typical values of the flash point corrected for barometric pressure for some reference materials and their typical limits are given in Table A2.1 (see Note A2.2). Suppliers of CRM's will provide certificates stating the method-specific flash point for each material of the current production batch. Calculation of the limits for these other CRM's can be determined from the reproducibility values of this test method, reduced by interlaboratory effect and then multiplied by 0.7 (see Research Report RR:S15-1008).
NOTE A2.1 - Supporting data for the interlaboratory study to generate the flash point in Table A2.1 can be found in research report RR:S15-1010.
NOTE A2.2 - Materials, purities, flash point values, and limits stated in Table A2.1 were developed in an ASTM interlaboratory program to determine suitability of use for verification fluids in flash point test methods. Other materials, purities, flash point values, and limits can be suitable when produced according to the practices of RR:D02-1007 or ISO Guides 34 and 35. Certificates of performance of such materials should be consulted before use, as the flash point value will vary dependent on the composition of each CRM batch.
A2.2 Secondary Working Standard (SWS) - SWS is a stable, pure (99 + more % purity) hydrocarbon, or other petroleum product whose composition is known to remain appreciably stable.
A2.2.1 Establish the meanflash point and the statistical control limits
for the SWS using standard statistical techniques.