PTFE hose runs from −70 to +260 °C, resists almost every industrial chemical, and is qualified with a 3:1 burst-to-working-pressure safety factor, lower than the 4:1 of braided rubber hose, because PTFE constructions behave differently under pressure. Working pressure is size-specific and falls steeply with bore: a stainless-braided smooth-bore hose rated around 200 bar at DN 6 holds roughly 70 bar at DN 25. This deep-dive decodes every line of a PTFE hose datasheet; the ordering workflow is in the companion 12-criteria selection checklist.
What is PTFE hose, structurally?
A PTFE hose is a fluoropolymer liner, smooth-bore or convoluted, extruded and sintered, that provides the chemistry, wrapped in reinforcement that provides the mechanics: usually one or two stainless-steel braids, sometimes a rubber or thermoplastic jacket. PTFE itself is chemically near-universal, has the lowest friction coefficient of common solids, and is physiologically inert, but it is also stiffer than rubber, notch-sensitive when over-bent, prone to cold flow under sustained clamping load, and a very good electrical insulator (which becomes a hazard, not a feature, with flammable media, see antistatic grades below).
How does working pressure scale with bore?
Steeply downward. Indicative catalogue values for smooth-bore PTFE hose with a single stainless braid (verify against the manufacturer's table, constructions differ):
| DN (bore) | Typical WP, single braid | Typical WP, double braid |
|---|---|---|
| DN 6 (¼") | ≈ 200 bar | ≈ 275 bar |
| DN 8 (5/16") | ≈ 172 bar | ≈ 240 bar |
| DN 10 (3/8") | ≈ 155 bar | ≈ 215 bar |
| DN 12 (½") | ≈ 138 bar | ≈ 190 bar |
| DN 16 (5/8") | ≈ 103 bar | ≈ 145 bar |
| DN 19 (¾") | ≈ 83 bar | ≈ 120 bar |
| DN 25 (1") | ≈ 69 bar | ≈ 100 bar |
Convoluted constructions of the same DN carry lower ratings; specialised spiral-reinforced PTFE designs go higher. Never apply one figure across a size range, and never mix figures between smooth-bore and convoluted variants.
The safety factor for PTFE hose is 3:1 burst-to-working pressure, a deliberate, class-specific value (braided rubber hose uses 4:1, unreinforced hose ~5:1). Proof testing is typically performed at 1.5 × WP (hydrostatic method per ISO 1402). As with all hoses, ratings are quoted at +20 °C and derate with temperature: at 200 °C expect roughly 60–70 % of the ambient rating for a single-braid assembly, request the pressure-temperature curve, and note that in many assemblies the end fittings and crimp interface, not the liner, set the practical thermal-pressure limit.
What temperature envelope does PTFE cover?
−70 to +260 °C continuous, the widest of any common hose liner. That single span covers cryogenic-adjacent cold starts, CIP/SIP steam sterilisation and hot aggressive chemistry without changing hose family. Two caveats:
- Steam couples pressure and temperature. Saturated steam at 6 bar is ~165 °C, at 18 bar ~210 °C: PTFE tolerates the temperature easily, but the assembly's derated pressure rating and the fitting interface must cover the steam condition. For dedicated steam duty, rubber steam hose to EN ISO 6134 (type 1: 6 bar/164 °C; type 2: 18 bar/210 °C, bolted safety clamps only) remains the reference solution.
- Thermal expansion is real: a 1 m assembly grows measurably at 200 °C; route with allowance so growth doesn't load the fittings.
What about bend radius and kinking?
PTFE is notch-sensitive: a single bend below minimum radius can crease the liner, and the crease propagates into a crack under pressure cycling. Smooth-bore MBR scales at roughly 6 × DN and grows with braid count; convoluted constructions reach about 4 × DN and exist precisely for tight-routing and flexing duty, at the cost of higher flow resistance and a bore that is harder to clean and drain. Decision rule: smooth-bore wherever routing permits (best flow, best cleanability, full CIP/SIP compatibility); convoluted where geometry or continuous flexing demands it. Never field-bend around an obstacle that an elbow fitting should handle.
When is antistatic PTFE mandatory?
Whenever the medium is flammable or combustible, or the hose operates in an ATEX zone (Directive 2014/34/UE). Standard PTFE is an excellent insulator; flowing solvent or fuel generates charge on the liner that can discharge through the wall as a pinhole (and ignite the medium). Antistatic grades use a carbon-black-loaded liner (fully or as a conductive core layer); the governing product standard for PTFE hoses and assemblies is EN 16643, and electrical resistance is verified by testing to ISO 8031, require the certificate and continuity across end fittings. One hard exclusion in the other direction: carbon-filled PTFE must never be used for oxygen service, oxygen duty demands virgin PTFE with oxygen-clean assembly procedures.
Which compliance regimes apply?
- FDA 21 CFR 177.1550, the US regulation for PTFE (perfluorocarbon) resins in food contact. (177.2600 is the rubber regulation, a common citation error on PTFE datasheets.)
- EC 1935/2004 + GMP 2023/2006, the EU food-contact framework; Regulation 10/2011/EU applies as PTFE is a plastic (it does not cover rubber or silicone).
- USP Class VI, biological reactivity, expected in pharmaceutical service, typically with extractables/leachables data and batch traceability (EN 10204 3.1 certificates for wetted metal).
- Vacuum and pressure test methods: ISO 7233 (vacuum resistance) and ISO 1402 (hydrostatic); vacuum capability is construction-specific, so confirm the datasheet rating rather than assuming full vacuum.
Every food or pharma certificate applies to a specific medium and hose version, verify your product, temperature and cleaning chemistry are covered.
The datasheet lines that decide assembly quality
The liner rarely fails first; the crimp interface does. PTFE's cold flow means the ferrule-liner joint is less forgiving than on rubber hose: crimp diameter, ferrule series and hose OD tolerance form one qualified system, and PTFE assemblies cannot be field-modified after crimping. Buy fabricated, tested assemblies with documented crimp specification and proof-test certificates. On installation: zero torsion (align before torquing, two spanners always), no bends below MBR, support long runs, and protect the exposed braid from chloride washdown — 316L braid where CIP chemistry or coastal air is involved.
A worked datasheet example
A DN 12 line transferring hot toluene at 140 °C, 25 bar, in an ATEX Zone 1 area, routed with a 90 mm bend: chemistry is trivial for PTFE but toluene is flammable, so the liner must be antistatic per EN 16643 (criterion checked with an ISO 8031 resistance certificate), which immediately excludes standard smooth-bore stock. Pressure: the single-braid rating of ~138 bar at DN 12 derates at 140 °C to roughly 100–110 bar, ample margin over 25 bar. The 90 mm bend exceeds a smooth-bore MBR of ~75 mm at this size, so smooth-bore antistatic single-braid passes on all counts; convoluted construction is unnecessary. Fittings: 316L with a documented crimp specification, since hot aromatic duty rules out cheaper alloys and elastomer-sealed interfaces need FKM, not NBR. Four datasheet lines, one certificate, and the assembly is specified defensibly.
Where PTFE beats rubber, and where it doesn't
PTFE earns its 2–5× unit-price premium in aggressive chemistry (acids, solvents, chlorinated media), high temperature, food/pharma purity and multi-product duty where one hose must tolerate everything between flushes: service life of 5–10 years versus 12–18 months for rubber in the same aggressive duty routinely makes PTFE the cheaper hose per year. In plain mineral-oil hydraulics below 100 °C or abrasive slurry duty (PTFE's abrasion resistance is poor), rubber constructions remain the rational choice. For the material head-to-head, see PTFE vs silicone hose and stainless steel vs PTFE hose.
Browse PTFE and chemical-resistant hoses in the industrial range or run a search for PTFE hose to compare smooth-bore, convoluted and antistatic constructions.
Specification support with tested assemblies
Send us the medium, temperatures, pressures, sizes and routing, our engineering team selects the construction (smooth-bore, convoluted, antistatic), matches qualified fittings, crimps to specification and pressure-tests every assembly with full documentation. Browse the industrial hose range, download the technical catalogues, or request a quotation.