EPA Method 508.1 & 525.2 Pesticide Standard Back Catalog number: 91970 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 6164-3-3L:250MG Pentafluoroethanesulfonic acid, 97%, 250mg Price on request 673954 gamma-HCH, 250mg Price on request 82534 EPA Method 8270C - B/N Matrix Spiking Solution Price on request