GC test mixture haloform for controlling the performance of fused silica capillary columns and the GC system. Contents: 9 halogenated hydrocarbons acc. to German drinking water specifications (in ng/mL) = dichloromethane (795), trichloromethane (75), 1,1,1-trichloroethane (67), tetrachloromethane (80), trichloroethene (73), bromodichloromethane (100), dibromochloromethane (122), tetrachloroethene (81), tribromomethane (145). This product contain harmful substances which must be specially labeled as hazardous. For detailed information please see SDS.