Stabndard contains: Diisopropyl ether(2000ug/mL), Ethyl-tert-butyl ether(2000ug/mL), t-amyl methyl ether(2000ug/mL), t-butyl alcohol(10000ug/mL)and Methyl tert-butyl alcohol(2000ug/mL) in P/T Methanol. 1.5mL per ampule. Stores refrigerated. A NIST Traceable Reference Materia