Chemical-Resistant PTFE / FEP / PFA Tubing
When polyolefin and PVC swell, crack or strip, the answer is a fluoropolymer, and a chemical resistant PTFE heat shrink sleeve is where most specifications start. Which of the three materials you actually need is decided by temperature, transparency and cost as much as by the chemical.
The problem this page solves
A standard polyolefin sleeve is a poor answer to a strong acid, a solvent or a hot caustic wash. The wall swells, the surface goes chalky, and the sleeve either cracks or strips off the part it was protecting. PVC behaves worse, and neither material belongs on a line that carries aggressive chemistry.
Fluoropolymer tubing covers the duty because the polymer itself is inert to most of what a chemical plant handles, and because the service temperature reaches 260 °C, which is well beyond where a polyolefin sleeve stops being usable.
The three materials are not interchangeable in practice. PTFE covers the widest service. FEP is the clearer general-purpose option at lower cost. PFA combines the temperature range with good clarity and purity, which is why it is used where the part is inspected or where contamination matters.
- Chemical attack : the polymer resists strong acids, bases and most solvents where polyolefin and PVC do not.
- Service temperature : the family is published at -65 to +260 °C, so hot lines and hot rollers stay inside the material limit.
- Roller covers : release plus chemical resistance is why fluoropolymer sleeves are used over rollers and idlers.
- Recovery temperature : fluoropolymer needs more heat than polyolefin and is less forgiving of a hot spot, so the method matters as much as the material.
Technical specification and published ratios
Ratings below are the published values on the Wellele product pages. The shrink ratio needs reading with the note underneath, because two pages in our own catalogue state it differently.
| Wellele Series-Type | Material | Published temperature | Shrink ratio as published | Reference standards | Cross-identification |
|---|---|---|---|---|---|
| WLL-PTFE-2X | PTFE | -65 to +260 °C | Family product page note states 1:1 for PTFE; the family band is published as 1.1:1 to 4:1 | UL94 V0, MIL-I-23053 | Raychem/TE TFE / TFE-R · Zeus PTFE Shrink |
| WLL-FEP-1.3X | FEP | -65 to +260 °C | 1.3:1 | UL94 V0, MIL-I-23053 | Raychem/TE FEP tubing · Zeus FEP tubing |
| WLL-PFA-1.5X / WLL-PFA-2X | PFA | -65 to +260 °C | The family note lists 4:1 for PFA; the dedicated PFA 2:1 page states 2:1 - confirm on the construction you order | UL94 V0, MIL-I-23053 | Raychem/TE PFA tubing · Zeus PFA tubing |
Two figures on this page have to be read together. The family product page publishes the ratio band as 1.1:1 to 4:1 with the note PTFE 1:1, FEP 1.3:1, PFA 4:1; the dedicated PFA 2:1 page states 2:1 for that construction. Ratios in this family are construction-specific, so confirm the ratio on the exact part you are ordering and treat any single family figure as a band rather than a promise. On standards: the reference published on the family page is UL94 V0 and MIL-I-23053. We do not quote AMS-DTL-23053/12 and we do not claim a food-contact or medical approval on this page. Cross-identification is for identification only; competitor designations are trademarks of their respective owners.
Selected products for this application
What to send for a material recommendation
Fluid and concentration
Service temperature
Geometry
Assembly method
Transparency
Quantity and length
Engineering questions we are asked
Which fluoropolymer suits which chemical?
All three resist strong acids, bases and most solvents far better than polyolefin or PVC, and the choice is usually made on temperature, transparency and cost rather than on chemical resistance alone. PTFE covers the widest service, FEP is the clearer general-purpose option at lower cost, and PFA combines the temperature range with good clarity and purity. Send the fluid name, its concentration and the service temperature and we confirm the grade rather than generalise.
What shrink ratio should I expect in this family?
Ratios here are construction-specific. The family page publishes a band from 1.1:1 to 4:1 with a per-material note, and the dedicated PFA page states 2:1 for that product. Size from the pass-over and gripping diameters and confirm the ratio on the exact part you order, because a family figure will not protect you if the construction you receive is a lower ratio.
Can these tubings cover a roller?
Yes, that is a common use. A roller cover takes a fluoropolymer sleeve for release and chemical resistance, and the sleeve is recovered or fitted hot depending on the construction. Send the roller diameter, the face length, the operating temperature and the fluid, and say whether the roller is crowned, because the crown changes the fit.
Is there a food-contact or medical approval on these materials?
We do not claim one. Our published reference for this family is UL94 V0 and MIL-I-23053 on the family product page. If your application needs a food-contact or medical declaration, ask before ordering and we will state what is available. We will not add an approval to a quotation to win the order.
How do I recover the tubing without damaging it?
Fluoropolymer needs a higher recovery temperature than polyolefin, and PFA and FEP tolerate a hot spot less well than a polyolefin sleeve. Use controlled hot air rather than a flame, move the heat along the part instead of dwelling in one place, and check the recovered wall at the ends. If your process uses an oven, tell us the setpoint and dwell you plan and we will confirm whether it suits the grade.
Send the fluid, the temperature and the geometry
Fluid name and concentration, service temperature, part diameter and length, and the assembly method you have available. We return the material, the ratio and a sample length for your own test.
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