# How to Specify a High Purity PTFE Hose Assembly > Step-by-step guide to ordering a high purity PTFE hose: core type, working pressure, braid and cover options, and UHP end fittings. Source: https://aftubes.com/blog/how-to-specify-high-purity-ptfe-hose-assembly/ --- [Home](https://aftubes.com/)›[Blog](https://aftubes.com/blog)›How to Specify a High Purity PTFE Hose A… Industry Insights ## How to Specify a High Purity PTFE Hose Assembly ![AFTubes Team](https://aftubes.com/uploads/author-savio-pereira.webp) AFTubes Team Advanced Fluro Pvt Ltd 16 October 2026 2 min read Ordering custom flexible tubing for semiconductor tool hookups, analytical equipment or ultra-pure chemical distribution needs precise specifications. The wrong inner diameter, pressure rating or end connection can cause flow bottlenecks, leaks or contamination. Use this guide to specify your [high purity PTFE hose](https://aftubes.com/ptfe-hose/) or high purity [SS braided PTFE hose](https://aftubes.com/ptfe-braided-ss304-hose/). ### Step 1: Choose the Inner Core Type - **Smooth-bore PTFE**: highest flow, lowest pressure drop, easy drainability and ultra-high cleanliness. Ideal for 3nm UHP gas lines. - **Convoluted (corrugated) PTFE**: maximum flexibility and tight bend radii for restricted spaces in OEM tools. See our [convoluted PTFE hose](https://aftubes.com/ptfe-corrugated-convoluted-hose/). - **Anti-static (conductive) PTFE**: essential for flammable liquids or high-velocity gases, to dissipate static build-up. ### Step 2: Match Working Pressure and Cover Non-braided PTFE tubing is limited to low pressure. For higher working pressures, choose a braided hose: - **Single stainless steel braid (304/316)**: standard for medium to high pressure lines. - **Double stainless steel braid**: for high-pressure surges or severe mechanical environments. - **Silicone or thermoplastic outer jacket**: added over the braid for easy cleanroom wipe-down and to prevent fraying. Need this specified for your line? Send your dimensions, working pressure and media — our engineers reply within one business day. Request a Quote ### Step 3: Select UHP End Fittings The connection must match your system's UHP integrity: | Fitting type | Typical application | | --- | --- | | Metal gasket face seal | UHP gas cabinets and VMB lines | | Tube adapter / stub | Direct orbital welding to stainless piping | | Sanitary tri-clamp | Biopharma and high-purity liquid chemical lines | | Flanged / NPT threaded | General industrial and bulk chemical skids | ### What to Send With Your Enquiry - Medium, concentration and temperature - Working and surge pressure - Inner diameter and length - Required bend radius and movement - End fittings at each end - Cleanliness and certification requirements ### Frequently Asked Questions #### Should I choose smooth-bore or convoluted PTFE? Smooth-bore gives the highest flow and easiest cleaning. Convoluted gives maximum flexibility and tighter bend radii in restricted spaces. #### When do I need a double braid? For high-pressure surges or severe mechanical environments where a single braid is not enough. #### Which fitting is standard for UHP gas cabinets? Metal gasket face seal fittings are the standard for UHP gas cabinets and VMB lines. ### Talk to Advanced Fluro Need help with lengths, bend radii or fitting combinations? Our engineers review drawings. [Request a quote or technical consultation](https://aftubes.com/contact/), call +91 96990 55600 or email [contact@aftubes.com](mailto:contact@aftubes.com). ![AFTubes Team](https://aftubes.com/uploads/author-savio-pereira.webp) Article by AFTubes Team Savio Pereira is a Chemical Engineer who has held leadership roles in companies like IBM. A passionate problem solver who thrives at finding solutions to engineering and business problems alike using simple innovative ideas. He believes in doing things differently rather than doing different things. His vision is to make Advanced Fluro (P) Ltd the most valuable company in the fluouro polymer industry. In This Article Have a Technical Question? Our engineering team advises on material selection, specifications, and your specific application. Contact Technical Team WhatsApp Us Related Articles [Industry InsightsPTFE Hose for 90°C, 30% KOH Green Hydrogen Electrolyzers3 min read](https://aftubes.com/blog/ptfe-hose-koh-green-hydrogen-alkaline-electrolyzer)[Industry InsightsProcess Gas Distribution to 2035: Smart PTFE Hose Trends2 min read](https://aftubes.com/blog/future-process-gas-distribution-smart-ptfe-hose-2035)[Industry InsightsHazardous Gas Safety with High Purity PTFE SS Braided Hose2 min read](https://aftubes.com/blog/hazardous-gas-safety-ptfe-ss-braided-hose) Advanced Fluro Private Limited ### Need Technical Guidance? Our engineering team advises on material selection, specifications, and application requirements across all fluoropolymer products. [Request a Quote](https://aftubes.com/contact)[WhatsApp](https://wa.me/919699055600)