Overview
Polyether Polyurethane TPU (Thermoplastic Polyurethane) is a block copolymer combining hard (urethane) and soft (polyether) segments. This structure grants it exceptional elasticity, durability, and resistance to oils and hydrolysis. Unlike polyester-based TPU, polyether TPU excels in wet environments, making it ideal for applications requiring long-term flexibility. Its thermoplastic nature allows for recycling and efficient processing via extrusion or injection molding. Developed in the mid-20th century, TPU has become a cornerstone material in industries demanding high-performance elastomers. Its adaptability to additives (e.g., flame retardants, colorants) further expands its utility.
Physical and Chemical Properties
Polyether TPU exhibits a Shore hardness range of 70A–95A, with tensile strength of 20–50 MPa and elongation at break exceeding 500%. Its low glass transition temperature (−40°C to −60°C) ensures flexibility in cold climates. The material resists UV radiation, ozone, and microbial growth, though prolonged UV exposure may cause slight yellowing. Chemically, polyether TPU outperforms polyester TPU in hydrolytic stability, making it suitable for underwater or humid applications. It withstands mild acids/bases but degrades in strong oxidizers. Its dielectric properties are moderate, with a volume resistivity of 10^9–10^12 Ω·cm.
Main Applications
Footwear accounts for 40% of TPU demand, where it replaces rubber in soles due to lighter weight and better abrasion resistance (e.g., running shoes). Automotive uses include CVJ boots, airbag covers, and interior trims, leveraging its vibration damping and noise reduction. Medical-grade TPU is biocompatible, used in catheters and wound dressings. Industrial applications include hydraulic hoses, conveyor belts, and 3D printing filaments. Emerging markets include eco-friendly textiles and smart wearables, where its breathability and stretch are valued.
Safety and Storage
TPU is generally safe under normal conditions, classified as non-hazardous per OSHA. Processing above 200°C may release trace isocyanates; adequate ventilation is advised. Storage requires moisture-proof packaging to prevent hydrolysis (even polyether grades absorb 0.5–1% water). Pellets should be dried at 80–100°C for 2–4 hours before processing. Avoid mixing with PVC or other chlorine-containing polymers, as degradation byproducts may form. Spills are non-reactive; sweep and dispose of as solid waste.
B2B Procurement Guide
Key procurement criteria include hardness (Shore A/D), tensile modulus (e.g., 10–100 MPa), and certifications (e.g., FDA, REACH). For extrusion grades, melt flow index (MFI) is critical. Suppliers often provide technical datasheets with ASTM/ISO test results. Bulk pricing breaks at 1-ton orders, with discounts up to 15%. Lead times vary from 2 weeks (standard grades) to 8 weeks (custom formulations). Verify supplier QC capabilities—batch-to-batch consistency in color and mechanical properties is vital for OEMs.
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