2,2',3,4,4',5-Hexachlorobiphenyl (137) Back Catalog number: 66137 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 98860 Formaldehyde-DNPH Level 3 (1.0ug/mL) Price on request NG-17604-1G Propionic acid sodium salt, 1g Price on request 95590 Petroleum Marker Standard Conc Price on request