WP Total Hardness Back Catalog number: 54597 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3383.12-100 Diphenylamine, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 122-39-4 Price on request HPCB-3004N 4-Hydroxy-2,2',5'-trichlorobiphenyl, 5mg Price on request 12013.20-50MG Bis(4-methyl-1-pentyl) phthalate,neat,neat,50mg, Price on request