GC test mixture Grob test for controlling the performance of fused silica capillary columns and the GC system. Contents (in mg/mL):n-decane (~ 2.8), n-undecane (~ 2.9), n-octanol (~ 3.6), 2,6‑dimethylphenol (~ 3.2), 2,6-dimethylaniline (~ 3.2), methyl decanoate (~ 4.2), dicyclohexylamine (~ 3.1), methyl undecanoate (~ 4.2), methyl dodecanoate (~ 4.1). This product contain harmful substances which must be specially labeled as hazardous. For detailed information please see SDS.