Valve Material Reference
PTFE / FEP Lining (ASTM D1457 / BS 6564) Valve
PTFE / FEP-Lined ValvesPTFE (polytetrafluoroethylene) and FEP (fluorinated ethylene propylene) lining systems eliminate metallic contact between the valve body and the process fluid, providing near-universal chemical resistance at a fraction of the cost of exotic alloy construction.
Form
Cast
Max Temp
+200°C (+392°F) for PTFE
Min Temp
−40°C (−40°F)
Category
Non Ferrous
Chemical Composition — PTFE / FEP Lining (ASTM D1457 / BS 6564)
Temperature Range
−40°C to +200°C (PTFE); −40°C to +150°C (FEP)
Maximum Temperature
+200°C (+392°F) for PTFE
Minimum Temperature
−40°C (−40°F)
Equivalent Grades — PTFE / FEP Lining (ASTM D1457 / BS 6564)
| Standard | Equivalent Grade |
|---|---|
| DIN | EN 12756 lined butterfly / ball |
| ISO | ISO 16135 lined ball valve |
| BS | BS EN 12516 lined construction |
Suitable Services
Hydrofluoric acid (dilute) — PTFE is one of few materials resistant to HF
Hydrochloric acid at all concentrations up to 150°C
Sulphuric acid up to 98% at ambient temperature
Chlorine water and hypochlorite solutions
Acetic acid, formic acid, and phosphoric acid
Pharmaceutical water-for-injection and API synthesis
Electroplating and surface treatment chemical lines
Chlor-alkali cell liquor and caustic soda service
Not Suitable For
Temperatures above 200°C — fluoropolymer mechanical strength fails; use alloy alternatives
Pressures above 16 bar (PN16) — lining may collapse or extrude
Abrasive slurries — lining can be mechanically abraded; use rubber-lined or hard-faced
Fluorine gas, chlorine trifluoride — attack the PTFE itself at high temperature
Steam above 150°C (risk of liner blister and delamination)
Valve Body Applications
Full-lined ball valves for acid dosing and neutralisation systems
Lined butterfly valves for chlor-alkali and bleach service
Lined diaphragm valves for pharmaceutical and ultra-pure water
Lined globe valves for corrosive chemical metering
Lined plug valves for HF dilute acid and chlorine water
Trim Applications
PTFE seats and seals throughout (no separate trim specification needed — lining is the wetted surface)
Typical Valve Types in PTFE / FEP Lining (ASTM D1457 / BS 6564)
Ball valves: full-lined PN10/16, chemical service, ANSI Class 150
Butterfly valves: lined wafer/lug PN10/16, acid and caustic service
Diaphragm valves: PTFE-lined weir type for pharmaceutical and ultrapure
Plug valves: lined eccentric for acid dosing
Browse PTFE / FEP Lining (ASTM D1457 / BS 6564) Valves
Technical Reference
Industry Applications · 10 min read
How to Specify Industrial Valves for Chemical Service: A Complete Guide
Chemical plants handle some of the most aggressive fluids in any industry — strong acids, chlorinated solvents, caustic solutions, oxidising agents, and toxic gases. Specifying the wrong valve body material, seat, or seal material can lead to catastrophic corrosion, product contamination, or unsafe failure. This guide covers every variable in chemical valve specification.
All Valve Materials
Need PTFE / FEP Lining (ASTM D1457 / BS 6564) Valves?
We supply PTFE / FEP Lining (ASTM D1457 / BS 6564) (PTFE / FEP-Lined Valves) gate valves, globe valves, ball valves, check valves, and more. Full certification documentation — EN 10204 3.1/3.2 MTCs, hydro test certs — as standard.