Polyurethane tube

When sourcing PU tubes, you must prioritize Shore Hardness (typically 95A or 98A) to ensure the balance between flexibility and kink resistance. Verify the Working Pressure (usually 8-10 bar at 23°C) and the Burst Pressure, which should be at least 3 times the working pressure for safety. Additionally, check the Dimensional Tolerance, as high-quality tubes should maintain a precision of ±0.05mm to ±0.1mm to ensure airtight connections with push-to-connect fittings.

The choice depends entirely on the application environment. Polyester-based PU is more cost-effective and offers better oil and fuel resistance, making it ideal for pneumatic tools and general air lines. However, if the tube will be exposed to high humidity, water, or fungi, you must select Polyether-based PU, as it provides superior hydrolysis resistance and maintains flexibility at lower temperatures without degrading.

For general industrial use, ensure the supplier complies with RoHS and REACH standards to guarantee the absence of hazardous substances. If the tubing is intended for food or medical applications, it is mandatory to request FDA CFR 21.177.2600 compliance or NSF-51/61 certification. For fire-sensitive environments, look for UL94-V0 or V2 flame retardant ratings.

PU tubes are primarily used in Pneumatic Control Systems, Robotics, and Automated Assembly Lines due to their excellent elastic memory and small bend radius. For specialized functions, you may require Anti-static (ESD) tubing to prevent spark discharge in electronics manufacturing, or UV-stabilized tubing for outdoor equipment to prevent cracking and discoloration from sunlight exposure.

The primary risk is material substitution, where suppliers use recycled PU or low-grade PVC blends to reduce costs, leading to premature tube failure. Another risk is inconsistent wall thickness, which causes leaks in pneumatic systems. To mitigate this, always request a Pre-Shipment Inspection (PSI) and use secure payment methods like Escrow or Trade Terms provided by reputable platforms like Made-in-China.com.

Focus on Volume-Based Pricing; for PU tubes, price breaks usually occur at 5,000 to 10,000 meters. Negotiate for Free Samples (you pay shipping) to test the 'snap-back' elasticity. For security, prioritize Audited Suppliers on Made-in-China.com who have undergone third-party verification by SGS or TÜV Rheinland, ensuring the factory actually possesses the extrusion lines they claim to have.

PU tubes are lightweight but bulky, meaning you are often charged by Volumetric Weight. To optimize shipping costs, request the supplier to use customized reel sizes or nested packaging to minimize dead space. For international trade, FOB (Free On Board) is recommended for large volumes to maintain control over freight costs, while DDP (Delivered Duty Paid) is more convenient for smaller trial batches to avoid customs clearance complexities.