PU Rod Solid PU Plastic Polyurethane Rod
Core Performance
Mechanical Properties
Ultra-High Elasticity and Flexibility: PU rods is available in a wide Shore hardness range (60A-95A, adjustable, 70A-85A is commonly used), it combines the high elasticity of rubber with the rigidity of plastic. At low hardness (60A-75A), it exhibits a sponge-like soft feel (compression set <10%), while maintaining excellent resilience (quickly recovering to its original shape after stretching) at high hardness (85A-95A).
Excellent Wear Resistance: Akron Abrasion Value ≤ 0.03-0.05 cm³/1.61 km (5-8 times lower than natural rubber and 10%-20% lower than polyester-based polyurethane). Deformation is minimal under long-term friction (for example, the inner wall life of pipes transporting sand and gravel slurry is 3-5 times that of rubber pipes).
High Tear Resistance: Tear strength ≥ 25-40 N/mm (transverse tears are unlikely to propagate easily), and puncture resistance surpasses that of ordinary rubber (withstanding impacts from sharp particles such as ore and gravel).
Excellent Fatigue Resistance: Under repeated bending or compression loads (e.g., cyclic stress of 30 MPa, frequency of 10 Hz), fatigue life exceeds 1 × 10⁷ cycles (over 10 times higher than ordinary plastics, suitable for dynamic load scenarios).
Thermal Performance
Wide Temperature Range: Conventional models have a long-term operating temperature range of -40°C to +80°C (short-term resistance to 100°C). High-temperature grades (modified polyether PU) can withstand short-term use up to 120°C (e.g., hot air ducts). Low-temperature grades (special polyether formulations) maintain flexibility down to -50°C (no brittle cracking or cracking when bent).
Low Thermal Expansion Coefficient: Approximately 8-10 × 10⁻⁵/°C (50%-60% lower than aluminum), resulting in superior dimensional stability compared to rubber during temperature fluctuations.
Chemical Properties
Excellent Hydrolysis Resistance: The ether bonds (-R-O-R-) in the backbone are more resistant to water attack than the ester bonds (-R-COO-R-) in polyester-based polyurethanes. Long-term use in humid environments (such as hot water and high humidity) shows no significant performance degradation (e.g., tensile strength retention >90% after immersion in 80°C hot water for 1000 hours), which is 2-3 times that of polyester-based polyurethanes.
Chemical Resistance Classification:
Stable to weak acids (e.g., carbonic acid, citric acid), weak bases (e.g., soapy water), saline solutions (e.g., sodium chloride), and most organic solvents (e.g., ethanol, acetone) (no swelling at concentrations <30%).
Not resistant to strong acids (e.g., concentrated sulfuric acid, concentrated nitric acid), strong bases (e.g., sodium hydroxide solutions >10%), and halogenated hydrocarbons (e.g., carbon tetrachloride). Long-term contact may cause surface softening or swelling.
Oil Resistance: Excellent resistance to mineral oil, hydraulic oil, and silicone oil (volume change <3%), but slightly higher permeability to gasoline and diesel (may cause slight swelling with long-term contact).
Electrical Properties
Excellent Insulation: Volume resistivity ≥10¹³Ω·cm (between conductors and insulators), dielectric strength 20-30kV/mm, suitable for low-voltage electrical insulation components (such as sensor housings and junction boxes).
Processability
Easy Forming: Can be processed through extrusion (rod diameter tolerance ±0.1mm), injection molding (for complex structural parts), or thermoplastic processing (such as turning and drilling). Waste can be partially recycled (requires separate processing). Processing temperatures are typically 80-120°C (thermoplastic PU) or mold curing (thermoset PU).
Connection Compatibility: Compatible with quick-connect fittings, flare connections, hot melt welding, or adhesive bonding (such as polyurethane adhesive). Excellent sealing (pressure leakage rate <0.1MPa/min).
