This Standard Reference Material (SRM) is intended for use as an isotopic standard. SRM 975a consists of 0.25 g of sodium chloride (NaCl). Purity of the NaCl is 99.89 % by mass. For more information, please refer to the COA and SDS.SRM 975A_cert SRM 975A _SDS Synonyms: Sodium chloride; Halite …