Qualitative retention time index standard. Certified reference material (CRM) containing 27 saturated hydrocarbons from C7 (n-Heptane) to C33 (n-Tritriacontane,) 100-200ug/mL each in hexane, 1mL ampule. Contact GC technical support for the complete compound and concentration list. Ships at ambient temp, store at 10C or colder. Maximum shelf life on ship date: 85 months, minimum: 6 months.