Internal Standard Back Catalog number: 95592 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3955.2-1G 1,1,1,2-Tetrachloroethane Price on request 71834 2,3,4,5-Tetrachloronitrobenzene Price on request 93927 Semi-Volatile Surrogate Standard Price on request