A pharmaceutical hose is a hygienic transfer hose whose bore material, smooth-bore PTFE, platinum-cured silicone or peroxide-cured EPDM, is certified for the medium it carries, resists repeated CIP/SIP cycles, and ships with full batch documentation. The wrong choice is not an inconvenience: it is a contamination event, a batch loss and potentially a regulatory action.
This guide is the buyer's reference for materials, construction, FDA/USP/Ph. Eur. compliance, hygienic end fittings and total cost of ownership. For the specification-pitfall checklist angle, see the sibling article Pharmaceutical Hose: What Every Procurement Engineer Must Know.
What Is a Pharmaceutical Hose?
A pharmaceutical hose transfers product, process fluids, purified water, solvents and gases in GMP-regulated pharmaceutical, biopharmaceutical and nutraceutical plants. Unlike general industrial hose, it must satisfy extractables and leachables (E&L) requirements, resist microbial adhesion, and withstand repeated sterilisation without degrading its bore surface or mechanical properties.
The defining element is the bore: inert to the process fluid, non-shedding, free of plasticisers and migratable compounds, with a smooth, crevice-free surface that supports validated cleaning. Typical duties span API synthesis, formulation, fill-and-finish, WFI distribution, buffer preparation and bioreactor connections, each with its own temperature, pressure, chemistry and sterilisation regime.
Construction and Types
Smooth-Bore PTFE Hose
A virgin PTFE inner tube (typically 0.5–2.0 mm wall) with 316L stainless steel braid, optionally covered in silicone or EPDM. Bore finish of Ra ≤ 0.4 µm as-extruded suits the most stringent aseptic duties. PTFE serves −70 °C to +260 °C, is chemically near-universal, and complies with FDA 21 CFR 177.1550. Working pressure depends on bore and braid count and falls as bore rises, a DN25 single-braid assembly is rated far lower than a DN10 one, so always read the size-specific datasheet. Note that PTFE hose is designed to a 3:1 burst-to-working-pressure safety factor, lower than the 4:1 typical of braided rubber hose, another reason not to transfer ratings between hose families.
Platinum-Cured Silicone Hose
A platinum-cured silicone tube, unreinforced or with polyester/stainless braid. Platinum (addition) curing avoids the peroxide by-products that can migrate into product. Silicone is autoclavable at 134 °C and biocompatible (USP Class VI grades), which makes it the standard for peristaltic pump circuits, bioreactor connections and flexible final-fill links. Its limits: no aromatics or concentrated chemicals, and no high-pressure steam duty.
EPDM Pharmaceutical Hose
Peroxide-cured (sulphur-free) EPDM tolerates steam sterilisation and alkaline CIP chemistry very well and is the cost-effective choice for large-bore (DN50–DN100) CIP/SIP and utility duties. EPDM must never see oils or solvents, for those, PTFE is the answer.
Convoluted PTFE Hose
Convoluting the PTFE tube multiplies flexibility for tight routing, at the price of cleaning-validation complexity in the convolutions and higher pressure drop. Generally reserved for vent, sampling and gas lines rather than product transfer.
Key takeaway: specify the bore surface finish (Ra value) contractually, a silicone hose at Ra 1.6 µm carries a different bioburden risk than one certified at Ra ≤ 0.8 µm. Material name alone is not a specification.
Key Parameters at a Glance
| Property | Smooth-bore PTFE | Platinum silicone | EPDM (peroxide) |
|---|---|---|---|
| Temperature range | −70…+260 °C | −60…+200 °C | −40…+150 °C |
| SIP / autoclave | Yes (assembly rating governs) | Yes, 134 °C | Yes (verify rating) |
| Chemistry | Near-universal | Aqueous, biopharma media | Water, CIP alkalis/acids |
| Not suitable for | Abrasive slurries (poor abrasion resistance) | Solvents, aromatics, high-pressure steam | Oils, fuels, solvents |
| FDA 21 CFR | 177.1550 | 177.2600 | 177.2600 |
| USP Class VI | Standard | Standard | On request |
Working pressure is quoted at 20 °C and falls with both bore size and temperature, always request the manufacturer's derating data for SIP conditions, and remember that the assembly rating (fittings included) governs, not the tube material in isolation.
Regulatory Compliance: Getting the Citations Right
- FDA 21 CFR 177.1550 covers PTFE; FDA 21 CFR 177.2600 covers rubber articles including silicone and EPDM for repeated contact.
- USP Class VI is a biological-reactivity qualification (systemic injection, intracutaneous, implantation tests), it confirms biocompatibility, complementing the compositional FDA rules. Ph. Eur. monograph 3.1.9 addresses silicone elastomer for closures and tubing.
- EC 1935/2004 with GMP Regulation 2023/2006 is the EU framework for contact materials. Critically, Regulation 10/2011/EU applies to plastics only, it does not cover rubber or silicone. A supplier citing 10/2011 for a silicone or EPDM hose is citing the wrong law; the correct references are FDA 21 CFR 177.2600, national rubber positive lists (e.g. BfR), 3-A and USP Class VI.
- Every food/pharma-contact certificate applies to a specific medium and a specific hose version. A declaration for aqueous media does not validate fatty or alcoholic media; a certificate for one tube compound does not carry over to a colour variant.
- ASME BPE governs hygienic equipment engineering: surface finish categories (SF1–SF6), weld and fitting quality. Ra ≤ 0.38 µm mechanically polished is the typical product-contact benchmark. EHEDG guidance complements it in European plants.
Hygienic End Fittings
316L stainless steel fittings with EN 10204 3.1 material certificates are the baseline. Be precise about the connection system, these are different, non-interchangeable standards:
- Tri-Clamp per DIN 32676 / ASME BPE, the clamp-ferrule system dominant in biopharma.
- DIN 11851, the threaded dairy coupling; a different system from Tri-Clamp, common in food-pharma crossover plants.
- DIN 11864, the aseptic union family designed specifically for sterile processes.
- SMS 1145, the Scandinavian dairy standard.
Gasket material must match the bore specification (PTFE or platinum silicone/EPDM per duty). Torque clamp connections to specification, over-compression extrudes the gasket into the flow path and creates a crevice. Browse hygienic connection options under industrial fittings and precision fittings.
Buyer Checklist
- Medium and CIP/SIP chemistry, obtain compatibility confirmation for the exact compound grade, at process temperature, not a generic polymer chart.
- Coincident pressure and temperature, a hose rated 16 bar at 20 °C may be a fraction of that at 135 °C SIP; request the derating curve.
- Sterilisation method: SIP, autoclave or gamma irradiation each impose different demands; confirm gamma stability (dose range) with the supplier.
- Surface finish, specify Ra contractually for the bore and for wetted fitting surfaces (ASME BPE).
- Connection standard: Tri-Clamp (DIN 32676), DIN 11851, DIN 11864 or SMS 1145; never assume interchangeability.
- Documentation, certificate of conformity with correct regulatory citations, EN 10204 3.1 certificates for metallic parts, pressure-test certificate (proof test ≈ 1.5× working pressure), lot traceability to raw-material batch, extractables data or dossier access.
- Drainability, installation geometry with continuous fall; convoluted bores need explicit cleaning validation.
- Bend radius, bending below the minimum wrinkles a PTFE liner and creates product-retention sites.
Search the range directly for pharmaceutical hose.
Installation and Handling
Flush new assemblies before service: WFI flush, passivation of stainless parts where the site protocol requires it, and a final flush to conductivity/TOC specification. Route with a continuous fall to the drain point; support horizontal runs so sag pockets cannot retain liquid between CIP cycles. In Grade A/B areas, prefer smooth outer covers or stainless overbraid over textile finishes (particle shedding), keep end caps on until connection, and follow the site's bagging and transfer regime.
Inspection and Failure Modes
- PTFE liner delamination or kink-wrinkling, from over-bending or thermal cycling beyond the envelope; detectable by borescopy; generates particulate.
- Silicone fatigue in peristaltic duty, replace on cycle count, not calendar time.
- Fitting movement or weeping, assembly integrity issue; withdraw and replace, then re-verify the supplier's assembly qualification.
- Out-of-spec rinse TOC/bioburden, the definitive functional test; investigate hose retention points first.
In continuous CIP/SIP duty, visual inspection at every connection plus a documented integrity inspection every six months is the minimum; many WFI applications specify quarterly checks and fixed annual or biennial replacement.
Cost and Total Cost of Ownership
A PTFE pharmaceutical assembly may cost 3–5× a general industrial hose, and a single hose-attributable batch rejection can cost several hundred times the assembly price. Qualification is the hidden cost driver: extractables studies typically run to several thousand euros per assembly type and supplier, so standardising on one documented bore material and one fitting standard across the facility, with a supplier change-notification agreement, reduces the validation burden far more effectively than shaving purchase price.
Specify with Support
Tubes International supplies PTFE, silicone and EPDM pharmaceutical hose assemblies with full documentation packages, material certificates, pressure-test reports and regulatory declarations matched to your medium. Start from industrial hoses, check the PDF catalogues, or request a quotation: our engineering team selects the hose and hygienic fittings and pressure-tests every assembly before shipment.