EPA 1620 Standard 1 Back Catalog number: 53139 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 684469 D8-1,4-Diaminobutane, 10mg Price on request 3308.12-100-IO 2,2',4,4',6,6'-Hexachlorobiphenyl, 100 µg/mL, Solvent-Isooctane, Unit 1mL, # of units-1, Cas.no. 33979-03-2 Price on request 675433 Pyridaphenthion, 100mg Price on request