14.65 x 26 mm 0.50 dram (1.85 ml) clear borosilicate compound vial with 13-425 neck finish, vial only. Low profile for greater stability, wide mouth for ease of sampling, these short clear glass compound vials are excellent for small quantities of powders or compounds. the lab-pak carton includes a shrink wrapped tray of 144 vials and a bag of 144 green thermoset F217 PTFE lined caps (not assembled). 1/4 dram, 1/3 dram and 1/2 dram vials available. Green thermoset (phenolic) caps are known for providing the widest range of chemical compatibility and for being the most temperature tolerant of plastic closures. the PTFE liners resist attack from virtually all chemicals at room temperature and provide resilience for a tight seal with a low moisture transmission rate. the PTFE face of the liner is backed by a low density foam core between two solid layers of ldpe.