High Purity Metacresol Purple Sodium Salt

The National Institute of Standards and Technology (NIST) has produced several high-purity (greater than or equal to 99.95%) reference materials (SRMs 84L, 136f, 350c, 351, 723e and RM 8040) that the chemical industry uses as primary standards. NIST requires 1 kg of high purity meta-cresol purple sodium salt (specified as > 99.8%) for a new Reference Material (RM). The intention is to bottle the meta-cresol purple sodium salt as a NIST Reference Material. Obtaining a free-flowing crystalline material with excellent homogeneity and primary standard grade purity are important considerations. Reference the attached documents for the complete solicitation.