Use the Thermo Scientific™ SureSTART™ TPX Screw Top Microvial with Glass Insert, Performance Level 3, when you are working with <2 mL samples and need maximum sample injection. This microvial is made of amber TPX polymethylpentene (PMP), which is lightweight and transparent and has both heat and chemical resistant properties. The fixed glass conical insert removes the need to assemble a vial and insert prior to use. This Level 3 vial is our highest Performance Level, designed to protect your most valuable samples and deliver consistent, reproducible results for your most demanding analyses.