Verification of apparatus performance
A4.1 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 ASTM RR:D02-1007 guidelines11 or ISO Guide 34 and 35.
A4.1.1 Values of the flash point corrected for barometric pressure for some reference materials and their typical limits are given in Table A4.1 (see Note A4.1). Suppliers of CRMs will provide certificates stating the method-specific flash point for each material of the current production batch. Calculation of the limits for these other CRMs can be determined from the reproducibility value of these test methods, reduced by interlaboratory effect and then multiplied by 0.7. See Research Report RR:S15-1008.
NOTE A4.1 - Materials, purities, flash point values, and limits stated in Table A4.1 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 ASTM RR:D02-1007 or ISO Guides 34 and 35. Certificates of performance of such materials should be consulted before use, as the flashpoint value will vary dependent on the composition of each CRM batch.
A4.2 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.
A4.2.1 Establish the mean flash point and the statistical control limits (3s) for the SWS using standard statistical techniques. (See ASTM MNL 7).
