Tall straight sided jar, 8 oz (240 ml) Clear with 58-400 green thermoset F217 & PTFE lined cap attached, 57 x 137 mm. clear/flint tall straight sided round jars are ideal for sampling and are designed without shoulders to provide maximum storage and visibility. Attached green thermoset (phenolic) are known for providing the widest range of chemical compatibility and for being the most temperature tolerant of plastic closures. The color green easily identifies the PTFE liner system. foam backed PTFE liners resist attack from virtually all chemicals at room temperature and provides resilience for a tight seal with a low moisture transmission rate. F217 has a low density foam core between two solid layers of ldpe. uses include analytical lab samples, high purity chemicals, strong acids solvents, environmental samples, pharmaceuticals, and diagnostic reagents. Thermoset closures cannot be remelted after they are formed. common thermoset cap resins include urea, phenolic, and melamine.