EPA 1638Mix A Back Catalog number: 52144 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 677483 Methyl valerate, 1ml Price on request DF-ST-A Native PCDD/PCDF Solution/Mixture, 1.2ml, nonane Price on request 66138 2,2’,3,4,4’,5’-Hexachlorobiphenyl (138) Price on request