Clear pet packer bottles provide a good alcohol and solvent barrier. These clear and transparent bottles make sample identification a snap. pet is stress and impact resistant. Ideal for oil analysis. They feature glass-like clarity and are durable and rigid. They also have exceptional gas and moisture barrier properties and a good alcohol & solvent barrier. 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.