EPA 1620 Standard 2 Back Catalog number: 52140 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675449 Piperacillin sodium salt, 100mg Price on request 685232 1,4-Dimethylnaphthalene, 100 µg/ml, Cyclohexane, Price on request 97295 UCMR 537 Custom Mix 3 Price on request