Internal Standard ASTM D-5307 Back Catalog number: 51124 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DPE-74 2,4,4',5-Tetrachlorodiphenyl ether, 1.2ml x 50ug/ml, nonane Price on request C15717010 Ofloxacin D3 hydrochloride, certified, 10mg Price on request 70354 2,3-Dichloro-1-propene Price on request