PTFE hose and silicone hose overlap only at first glance. Choose PTFE for aggressive chemistry (near-universal resistance from −70 °C to +260 °C), for pressure, braided PTFE assemblies reach 200+ bar at small bores, versus roughly 15 bar for fabric-reinforced silicone, and for oxygen-tight, low-extractable transfer lines. Choose silicone for low-pressure, high-flex duties: peristaltic pumps, coolant and hot-air routing, and biopharma tubing where its elasticity and platinum-cure purity shine. The decision hinges on chemistry, pressure and one frequently reversed detail: gamma sterilisation suits silicone, not PTFE.
What Are the Two Materials?
PTFE hose is built on a polytetrafluoroethylene liner, smooth-bore or convoluted, usually over-braided with stainless steel (316L) for pressure retention. PTFE is chemically inert against almost everything encountered in process industry, non-stick (protein and product residues release easily), and spans −70 °C to +260 °C continuously. Two engineering caveats define its limits: PTFE is an electrical insulator, so flammable-media duty requires antistatic carbon-loaded liners (hoses per EN 16643, resistance verified per ISO 8031), and its abrasion resistance is poor, so particulate-laden media call for other linings.
Silicone hose is polydimethylsiloxane (PDMS), peroxide- or platinum-cured, typically reinforced with polyester or aramid fabric plies. Its silicon, oxygen backbone gives outstanding thermal stability (approximately −60 °C to +230 °C) and elasticity that survives millions of flex cycles, the property that makes it the peristaltic pump material. Its limits are equally clear: silicone is not for aromatic hydrocarbons, fuels, concentrated acids and alkalis, or pressurised steam.
Construction and Pressure Capability
| Construction | Reinforcement | Typical max WP (small DN, falls as DN rises) | Primary use |
|---|---|---|---|
| Smooth-bore PTFE | 316L wire braid | up to ~200+ bar | Chemical transfer, instrumentation |
| Convoluted PTFE | Single/double braid | lower than smooth-bore | Tight routing, flex duty |
| Antistatic PTFE (EN 16643) | Wire braid | as smooth-bore class | Solvents, fuels, ATEX zones |
| Standard silicone | Polyester fabric plies | ~6–15 bar | Coolant, hot air, wash-down |
| Multi-ply/aramid silicone | Aramid fabric | up to ~20 bar range | Heavier process duty |
| Platinum-cure silicone tubing | Unreinforced or single ply | low pressure | Pharma, peristaltic pumps |
Two rules carry across both families: working pressure falls as bore rises and is quoted at +20 °C with temperature derating; and safety factors differ by class — PTFE hose is built to a 3:1 burst-to-working-pressure factor (braided rubber hose uses 4:1), with the routine assembly proof test at approximately 1.5 × WP.
Parameter Comparison
| Parameter | PTFE (braided) | Silicone (fabric-reinforced) |
|---|---|---|
| Continuous temperature | −70…+260 °C | ≈ −60…+230 °C |
| Chemical resistance | Near-universal | Limited, no aromatics, fuels, concentrated acids/alkalis |
| Pressure capability | High (braid-dependent) | Low (~15–20 bar max) |
| Gas/oxygen permeability | Very low | High — PDMS is notably gas-permeable |
| Flexibility / flex fatigue | Moderate (convoluted improves) | Excellent, peristaltic-grade |
| Abrasion resistance | Poor | Moderate |
| Electrical behaviour | Insulator, antistatic version for ATEX (EN 16643) | Insulator |
| Food/pharma route | FDA 21 CFR 177.1550; USP Class VI | FDA 21 CFR 177.2600; USP Class VI |
| Sterilisation | Autoclave, SIP, CIP — not gamma | Autoclave, CIP, limited SIP; gamma-tolerant |
| Relative cost | 1.5–4 × silicone | Baseline |
Three of these rows repay attention. Oxygen permeability: silicone's gas-open backbone oxidises oxygen-sensitive products (beer, wine, injectables) over dwell time — PTFE eliminates the mechanism. Sterilisation: gamma irradiation degrades PTFE by chain scission even at modest doses, whereas platinum-cured silicone tolerates standard 25–40 kGy sterilisation doses, single-use gamma-sterilised assemblies are silicone territory, and PTFE lines are sterilised by steam (SIP) or autoclave instead. Regulatory routes: EU Regulation 10/2011 covers plastics only, silicone rubber falls outside it and is assessed under FDA 21 CFR 177.2600 (PTFE under 177.1550), within the EC 1935/2004 framework; certificates apply to the specific compound and hose version.
Where Each Material Wins, by Industry
Chemical/petrochemical: PTFE in nearly every case, solvents, acids and aromatics attack PDMS within hours to days. Flammable solvent transfer additionally requires the antistatic PTFE variant with verified continuity. See also Chemical Hose vs Food-Grade Hose.
Pharma/biotech: both, at different stages. Platinum-cure silicone dominates peristaltic pump heads and low-pressure single-use trains (gamma-sterilisable); smooth-bore PTFE dominates CIP/SIP transfer lines and fill-finish where extractables, surface finish and steam sterilisation govern.
Food and beverage: silicone for short-contact, low-pressure, high-flex duties; PTFE for hot-fill, high-acid (pH < 3), long-dwell and oxygen-sensitive products.
Automotive/test rigs: PTFE for fuel, oil and brake-fluid lines under pressure and heat; silicone for charge-air, coolant and turbo plumbing at low pressure. Note silicone's fuel/aromatics exclusion, it is never a fuel-line material.
Steam: treat with care in both cases. Silicone is not suitable for pressurised steam service; PTFE assemblies handle SIP steam (121–134 °C) routinely, but remember that in saturated steam pressure and temperature are coupled, verify the assembly rating for the steam condition, and for dedicated steam duty use a proper EN ISO 6134 steam hose (see the Steam Hose Technical Guide).
Selection Checklist
- Chemistry first, any aromatic, fuel, halogenated solvent or concentrated acid/alkali eliminates silicone immediately.
- Pressure at your DN, above ~15–20 bar the answer is PTFE (or another hose class entirely).
- Temperature, continuous duty above +230 °C: PTFE only; verify derating curves in both cases.
- Oxygen/gas sensitivity, oxygen-sensitive product or gas-tight duty: PTFE smooth-bore.
- Sterilisation method, gamma: silicone; SIP/steam-heavy regimes: PTFE.
- Flex duty, peristaltic or high-cycle dynamic flexing at low pressure: platinum-cure silicone; tight static routing at pressure: convoluted PTFE.
- ATEX/flammable media, antistatic PTFE per EN 16643, continuity verified per ISO 8031 and earthed.
- Certification, request the compound-specific certificate: 177.1550 (PTFE) or 177.2600 (silicone), USP Class VI where required; remember 10/2011/EU does not apply to silicone.
- End fittings: PTFE assemblies need qualified crimping or flare-through fittings per the manufacturer's specification; silicone uses barb/Tri-Clamp systems at its low pressures.
- Lifecycle cost: PTFE's 1.5–4 × purchase premium usually wins in chemical or high-cycle duty; silicone wins where fatigue, not chemistry, sets the replacement interval.
Inspection and Failure Modes
Braided PTFE fails externally first: braid corrosion (chlorides against under-specified braid, use 316L in washdown/coastal service) and broken wires near fittings; replace when broken wires appear in clusters. Kinked smooth-bore PTFE is permanently damaged, replace, never straighten. Silicone fails by surface cracking (ozone/UV), hardening, or swelling, wall swelling beyond ~10 % signals chemical incompatibility and immediate withdrawal. In regulated plants, both need a documented hose-management programme: asset IDs, installation dates, test records, defined replacement intervals.
Browse PTFE hoses and silicone hoses in the industrial hose range; deep-dives live in the sibling guides PTFE Hose: Complete Technical Guide and Silicone Hose: Complete Technical Guide. Our engineering team selects liner, braid and fittings for your media and sterilisation regime, and pressure-tests every assembly: request a quotation with your process data.