CT 1PPM 1,4 DIFLUOROBENZENE 1PPM BROMOCHLOROMETHANE 1PPM CHLOROBENZENE-D5 BALANCE NITROGEN SIZE HPI CERTIFIED STANDARD-SPEC CGA 350 RESTEK P/N 34412-PI PRIVATE LABEL STD TO INTERNAL STANDARD -RESTEK BLEND +/-10%, ACCURACY +/-5% CUSTOM MIX