... diaphaneity, 3. Electrical insulation, 4. Anti-corrosion. Characteristics for FEP tube: 1. No sticky, 2. No poison,3. Antilflaming,4 ... resisttance, 7. Anti high and low temperature.Applications for FEP tubes:It’s widely used in:1. Heat exchangers, ... O-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