GC test mixture OPTIMA for controlling the performance of fused silica capillary columns and the GC system. Contents (0.1 % each):undecane, dodecane, octanol, dimethylaniline, decylamine, methyl decanoate, methyl undecanoate, henicosane, docosane, tricosane. This product contain harmful substances which must be specially labeled as hazardous. For detailed information please see SDS.