--- title: "PU vs. Nylon Tubing: A Practical Selection Checklist" canonical: "https://yuannaitube.com/pu-vs-nylon-tubing-selection-checklist/" language: "en-US" --- RESOURCES # PU vs. Nylon Tubing: A Practical Selection Checklist By [YUANNAI TUBE]() Published 2026-10-10Updated 2026-11-03 ![Clear and black pneumatic tubing coils on an engineering workbench]() ## Quick Answer: Polyurethane vs. Nylon Tubing (PU vs. PA6 & PA12) Compare PU and **nylon tubing** against the same application requirements: dimensions, medium, **working pressure** at the **operating temperature**, routing and fittings. Keep PA6 and PA12 as separate candidates. Material-level differences are a starting point; approval must use the exact product model and its supporting data. Part of the [pneumatic tubing guide]() . Comparing grades rather than families? The [polyether vs PU comparison]() covers the choice inside polyurethane itself. ## Polyurethane vs. Nylon Tubing: Sizing for Air Lines and Automation The question **polyurethane vs nylon tubing** should be answered with the same installation and operating requirements for both candidates. For a pneumatic connection, compare PU with the specified PA6 or PA12 model using the checklist below; neither material name establishes a universal winner. For a detailed breakdown between standard polyamide and flexible long-chain polyamide, read our [PA6 vs PA12 nylon tubing comparison]() . Choosing between polyurethane (PU) and nylon (PA) tubing starts with the application, rather than the material name alone. Two tubes with the same outside diameter can have different wall thicknesses, operating limits and installation requirements. This checklist helps equipment builders and buyers prepare a useful comparison. ## 1. Describe the installation When selecting **nylon vs polyurethane air line** tubing, record where the line will run, whether it will remain stationary or flex dynamically inside a robotic track, and how much space is available around bends and connections. PU is commonly considered where flexible routing is important. For typical [pneumatic automation routes]() and [under-hood automotive routing]() , record the available space before comparing materials. Nylon is another option to compare where the specified product offers the operating characteristics your application requires. Festo’s tubing overview describes differences between its PU and PA ranges in flexibility, temperature and pressure resistance. Those comparisons concern its products; they are not ratings for Yuannai Tube. Always use the data for the exact product you intend to purchase. ## 2. Compare the actual product specifications Start with the **inner diameter**, **outer diameter** and **wall thickness**. Then review the listed **working pressure**, temperature information and any conditions attached to those values. Pressure ratings are set per model, and the maximum temperature and the maximum pressure are listed separately. Our [PU tubing]() , [PA6 nylon tubing]() and [PA12 nylon tubing]() pages provide product-specific information. Keep PA6 and PA12 as separate candidates when reviewing a specification. ## PU, PA6 and PA12: a practical comparison Selection evidence available for the AIR PASSAGE ranges | Check | PU | PA6 nylon | PA12 nylon | | --- | --- | --- | --- | | Material family | Polyurethane | Polyamide 6 | Polyamide 12 | | Medium stated in the 2026 data sheets | Compressed air, inert gases and vacuum circuits | Compressed air, lubricating oil, mineral oil, fuels and ethylene-glycol antifreeze | Compressed air, mineral/hydraulic oil, diesel, petrol and antifreeze | | Dimensional review | Check the PU model table | Check the PA6 model table | Check the PA12 model table | | Pressure and temperature | Use the exact model values and confirm their test conditions. Do not combine separate maximum values or treat burst pressure as working pressure. | Use the exact model values and confirm their test conditions. Do not combine separate maximum values or treat burst pressure as working pressure. | Use the exact model values and confirm their test conditions. Do not combine separate maximum values or treat burst pressure as working pressure. | | Routing and movement | Confirm installation space, stated bend radius, movement and fitting requirements for the selected model. | Confirm installation space, stated bend radius, movement and fitting requirements for the selected model. | Confirm installation space, stated bend radius, movement and fitting requirements for the selected model. | | Commonly listed supply lengths | 100 m / 200 m | 100 m / 200 m | 100 m / 200 m | | Product information | [PU specifications]() | [PA6 specifications]() | [PA12 specifications]() | Source: 2026 technical data sheets on the linked product pages. Listed media are data-sheet descriptions, not blanket compatibility approvals; concentration, temperature, exposure time and model suitability require confirmation. Supply length depends on the selected size and order. Each material is selected on its own model data. ## 3. Include the medium and environment Identify what will pass through the tube and what may contact its outside surface. Include cleaning agents, outdoor exposure, moisture and nearby heat sources in your **inquiry**. Ask for confirmation against the intended service conditions instead of assuming that a tube is suitable because the polymer name is familiar. Outdoor and washdown exposure, such as [sprayer and irrigation lines]() , should be listed separately from indoor clean assembly. ## 4. Check the tubing and fitting combination Provide the fitting model and the manufacturer’s dimensional requirements. Confirm whether the connection is specified by outside diameter or another dimension. Also review the fitting’s own pressure, temperature and material limitations: the tube specification alone is not a rating for the complete assembly. ## 5. Confirm before placing the order - Material and exact tubing model. - Inner and **outer diameter**, units and required tolerances. - Medium, **working pressure** and **operating temperature**. - Routing, motion and installation constraints. - Fitting model, length, color and quantity. - Required documentation and sample evaluation. [Send your application details to our team]() so we can discuss the available options and the information needed for your purchase. If the tube will run on [packaging machinery]() , include the cycle rate and whether the route moves. Further reading: [Festo: Pneumatic tubing overview]() . External manufacturer information is background reading, not a substitute for the specification of the product being ordered. ## Common selection questions ### Can nylon directly replace PU tubing? Not from the material name or outside diameter alone. Confirm the **inner diameter**, fitting requirements, pressure at temperature, bend space and service conditions before substitution. ### Does a higher burst-pressure value mean a higher usable working pressure? No. Burst and **working pressure** describe different conditions. Use the stated working limit for the exact model and confirm the test temperature and safety requirements. ### Is the stated medium list a compatibility guarantee? No. Identify the exact fluid or gas, concentration, temperature and exposure conditions. Obtain confirmation for the intended tubing model and complete assembly. ## Sources and information limits The comparison table uses the 2026 technical data sheets on the linked product pages. The external Festo overview is material-selection background for Festo products, not a rating or approval for AIR PASSAGE tubing. The data sheets do not include every test method or a complete pressure–temperature relationship. ## Named sources used in this article Material-selection background and a temperature caution for **polyurethane tubing** come from third-party sources. They are not ratings for YUANNAI TUBE products. **References** - [Festo — Overview plastic tubing, standard O.D.]() (manufacturer documentation, PDF). - [Compressed Air Systems, Inc. — Polyurethane Tubing]() (product listing noting that “**working pressure** decreases significantly above 75º F”, accessed 21 October 2026). ## Frequently asked questions ![PA12 Nylon Tubing product photograph]() Fig. 1: Semi-rigid polyamide tubing coils delivering high burst pressure and dimensional stability. Which is better for air compressors, PU or nylon tubing? For flexible drop lines, air tools, and handheld blow guns, polyurethane (PU) tubing is preferred because of its rubber-like elasticity, kink recovery, and superior operator ergonomics. For main plant air distribution headers or high-vibration engine compressors, semi-rigid nylon (PA12 or PA6) is preferred because of its higher **working pressure** ratings (up to 41 bar) and dimensional rigidity between mounting clamps. How does ambient humidity affect push-in fitting retention on PU vs nylon? Polyurethane and PA12 nylon exhibit near-zero moisture absorption and retain precise outside diameter tolerances (±0.10 mm) in humid environments, ensuring constant collet grip. In contrast, standard PA6 absorbs up to 2.5% to 3.0% ambient moisture and can swell slightly, which increases insertion forces in tight push-in fittings over time. Can PU and PA6 be used in the same pneumatic system? Yes, provided each section uses a tube and fitting combination that is approved for its own duty. Do not mix materials inside one continuous line without recording which section uses which model, because replacement and inspection then become ambiguous. Which is better for tight bend routes, PU or PA6? Flexibility favors PU, while dimensional stability and pressure capability favor the specified PA6 or PA12 model. The deciding figure is the **bend radius** stated for the exact model, not the material family. Does a higher durometer always mean a better tube? No. Hardness describes the compound, not the pressure rating; [tubing Shore hardness]() explains how to read the number. Selection should use **wall thickness**, **working pressure** at the **operating temperature**, medium and fitting compatibility for the exact model. Can a PA12 tube be replaced by PA6 without changing fittings? Not automatically. The same outside diameter can carry a different **wall thickness** and pressure rating, and the fitting specification may differ. Compare both model tables before substituting. **Related guides:** [tubing size chart]() · [push-in fittings and tubing]() · [working pressure and temperature]() · [PU pipe and pneumatic pipe vs tubing]() . ## Sources and scope - [PU Tubing — English data sheet (v3-20261020)]() - [PA6 Nylon Tubing — English data sheet (v4-20261020)]() - [PA12 Nylon Tubing — English data sheet (v5-20261020)]() Use these documents for the identified product models and stated test conditions. General material comparisons and selection checklists do not establish a different grade’s rating, fitting compatibility or project approval. Confirm the exact model, medium, temperature, pressure and required evidence before ordering. Content review: [zhangkexin]() · Marketing Review scope: market information and document references. ## Continue reading - [Tubing dimensions: ID, OD and wall thickness]() - [Pressure and temperature: information for tubing selection]() - [Pneumatic Tubing Bend Radius: A Routing Checklist]() ## Tell us what your application needs. Send your dimensions, operating conditions and quantity. Let’s identify the right tubing for your project. [Request a Quote →]() ## Related tubing products ![PA12 Nylon Tubing]() [PA12]() ### PA12 Nylon Tubing PA12 nylon tubing for pneumatic, hydraulic-oil and fuel lines. 14 models from 2.5 x 4 mm to 12 x 16 mm and 1/8″ to 1/2″, in 100 m or 200 m rolls. [View details →]() ![PA6 Nylon Tubing]() [PA6]() ### PA6 Nylon Tubing PA6 nylon tubing for fixed pneumatic, oil and fuel lines. 14 models from 2.5 x 4 mm to 12 x 16 mm and 1/8″ to 1/2″, in 100 m or 200 m rolls. 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