1-Butene Back Catalog number: 71677 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended C-063N 2,3,4',5-Tetrachlorobiphenyl, 5mg Price on request 675720 Heptachlor-exo-epoxide, 100 µg/ml, Ethyl acetate, Price on request DF-2-S 2-Chlorodibenzofuran, 1.2ml x 50ug/ml, nonane Price on request