... 3. Electrical insulation, 4. Anti-corrosion. Characteristics for PFA special tube: 1. No sticky, 2. No poison,3. Antilflaming,4. ... . Applications for FEP tubes:It’s widely used in:1. Heat exchangers, 2. steam piping, 3. High-purity reagents Pipeline, ... ring plastic tube. FEP tubes FEP tubes PTFE tubes FEP ,PFA corrugated tubes SS braided convoluted PTFE tube FEP heat shrink tube, PFA heat shrink tube