EPA Method 527 Surrogate Standard Back Catalog number: 95053 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 54003 Hexamethylenetetramine, ACS Price on request 71093 Bentazon methyl derivative Price on request C580002-1MG Clindamycin-d3 Hydrochloride, 1mg Price on request