28-400 Black Semi Ribbed Skirt Cap PTFE Liner

28-400 PP Phenolic Teflon Cap with PTFE Liner

Our 28-400 PP Phenolic Teflon Cap features a PTFE Liner (Polytetrafluoroethylene). These durable Semi-Ribbed Phenolic plastic caps have high tensile strength and are made to be durable. For instance, Phenolic Caps are mainly used in environments that use corrosive chemicals and liquids. This makes it an ideal closure to handle aggressive products that contain hot temperatures and acids.

Phenolic Teflon Cap comes with PTFE Liner inserted. PTFE Lined caps are great replacement caps for bottles, flasks, packer bottles, and more. PTFE Liners are best known for their chemical compatibility, being able to withstand high temperatures of up to 620.6°F (327°C). It is able to withstand up to most chemicals at room temperature, providing durability to all containers with a tight seal and low moisture transmission. 

The PTFE liner has a low-density foam core between two layers of LDPE (Low-density polyethylene) bonded within the cap to prevent it from falling out. The most common uses of our 28-400 PP Phenolic Teflon Cap with PTFE Liner are pharmaceuticals, strong acid solvents, high-purity chemicals, diagnostic reagents, and various lab and environmental samples.

Our Phenolic Teflon Cap with PTFE Liner has a 28-400 neck finish. For instance, the first number refers to the diameter (in mm), and the second refers to the closure depth, style, and thread.

In conclusion, This top is a good fit for any of our 28-400 Boston Round Containers and is great for a variety of uses from aromatherapy and essential oils to vape juice. Pair this dropper with one of our great “Matching Products” below.