QC Standard 4 Back Catalog number: 52087 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 684133 1,1,2-Trichloroethane, 1000 µg/ml, Methanol, 1ml Price on request 672945 trans-Permethrin, 10mg Price on request 55209 Hexavalent Chromium Price on request