PTFE LINED PIPING SYSTEMS  THE MYTHICAL SOLUTION
There is a lot of misinformation in the market place concerning  PTFE lined pipe. The way some plastic lined pipe manufacturers act you are led to believe that it is the  solution to all your plastic lined pipe requirements and will handle all service  conditions from  mild to hazardous. That is simply not true. PTFE lined piping systems  are prone to several very important problems:
1. PTFE  lined pipe and PTFE lined fittings must be vented according  to the ASTM specification for plastic lined pipe and plastic lined fittings, F-1545. (Click on the link below to order your copy of F-1545.) PTFE is the most permeable  fluoropolymer because it is  vented, everything that permeates the liner is  released into the atmosphere.
 2. PTFE has the poorest mechanical properties of any fluoropolymer. The joints in a PTFE  lined piping system are constantly being affected  by joint creep and cold flow. Tight joints are crucial to the integrity of a plastic lined piping system. The only thing worse than releasing your product into the atmosphere is dumping it on the ground, equipment, or personnel through a leaky joint.
3. Cheapness recommends it. PTFE is the least expensive fluoropolymer  resin used  in plastic lined pipe and plastic lined fittings. It is 15 to 20% of the cost of other fluoropolymers. The trade off  is that you give up excellent permeation  resistance and mechanical properties to save money. Plastic lined piping systems  are most often used to carry chemicals that are dangerous and hazardous to your  health. Do you want to compromise your safety and the safety of others by using  a PTFE lined piping system because it is less expensive than one with better  mechanical properties, exceptional  permeation resistance, and best of all  doesn't leak?
There are  alternative liner systems for your hazardous chemical  services, such as, plastic lined pipe and fittings with Polypropylene, PVDF, ECTFE, ETFE, MPFA, and PFA as well as PTFE.

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