Pneumatic pipelines for automatic handling, stamping and clamping stations deliver compressed air. Flexible PU hoses suit frequently moving robot arms, rigid PA12 nylon tubes feature high pressure & oil resistance for fixed high-pressure machine tool pipelines. Random interchange leads to long-term aging burst of PU hoses under high pressure, triggering safety hazards and air source waste.
| Tube Material | Standard Continuous Working Pressure | Instant Burst Pressure | Cutting Fluid & Machine Oil Resistance | Low-temperature Bending Cycle Life | Recommended Application Scenarios |
| PU Polyurethane Hose | 0~0.8MPa | 1.2MPa | Average, swelling & softening under long oil exposure | 500,000 reciprocating bends without crack | Moving robot arm pipelines, low-pressure sorting conveying equipment |
| PA12 Nylon Rigid Tube | 0~1.6MPa | 2.8MPa | Excellent, no deformation under long cutting fluid immersion | Fatigue crack after 150,000 bends | Fixed high-pressure machine tool air lines, main air compressor pipelines |
1. 0.4~0.8MPa low-pressure moving robot arms: Transparent/black PU hose matched with PU dedicated PC straight & PL elbow quick fittings for flexible reciprocating movement; 2. 0.8~1.6MPa fixed high-pressure machine tool lines: PA12 nylon tube matched with thick nickel-plated copper quick fittings to eliminate high-pressure air leakage; 3. Heavy oil-contaminated stamping production lines: Full PA12 nylon tubes only, PU hoses forbidden to avoid swelling & falling off under cutting fluid corrosion; 4. Outdoor winter low-temperature automation equipment: Low-temperature modified PU hose, standard PU hardens & cracks below 0℃.
1. Bend radius control: PU hose min bend radius ≥4× tube OD, PA12 tube ≥8× tube OD, small radius accelerates fatigue crack; 2. Fitting disassembly rule: Press outer clip ring before pulling tube, direct hard pulling damages inner sealing ring and causes air leak; 3. Annual inspection & replacement cycle: Sample test PU moving hoses every 6 months, full batch replacement after 12 months; full PA12 high-pressure tube renewal every 24 months; 4. High-temperature station protection: Install flame retardant corrugated tube for pipelines near welding & hot pressing stations to isolate high heat and prevent premature tube burst.