Overview
Aging-resistant TPU granules are engineered thermoplastic polyurethanes modified with light stabilizers and antioxidants to prevent degradation from sunlight, oxygen, and moisture. These polymer materials retain elasticity (typically Shore 60A-80D) and mechanical strength for 5-10 years in outdoor applications. Unlike standard TPU, these formulations incorporate specialized additives like hindered amine light stabilizers (HALS) and carbon black, which absorb UV radiation. They are produced through reactive extrusion processes that ensure homogeneous distribution of protective components within the polymer matrix.
Physical and Chemical Properties
The granules exhibit tensile strength of 25-50 MPa and elongation at break exceeding 400%, with hydrolytic stability maintained even at 70°C/95% relative humidity. Their UV resistance is typically validated through 2000+ hours of QUV testing per ASTM G154. Key chemical attributes include resistance to ozone, mild acids/bases, and fungal growth. The material maintains flexibility down to -40°C while resisting permanent deformation (compression set <30% after 22 hours at 70°C). Electrical properties include volume resistivity of 10^9-10^12 Ω·cm.
Main Applications
Automotive sector utilizes these granules for exterior trim, CVJ boots, and cable sheathing where exposure to engine heat and sunlight is constant. In industrial settings, they're molded into hydraulic seals, conveyor belts, and offshore equipment components. Consumer applications include premium sporting goods (dive watch straps, golf cart tires) and architectural membranes. Medical-grade variants with enhanced aging resistance are used for reusable sterilization pouches and prosthetic device coatings.
Safety and Storage
While TPU itself is non-toxic (meets FDA 21 CFR 177.1680), processing at >200°C may release trace amounts of isocyanates. Adequate ventilation and PPE (nitrile gloves, N95 masks) are recommended during material handling. Storage requires double-layer moisture-proof packaging with desiccants. Shelf life is typically 12 months when stored below 30°C at <50% humidity. Opened bags should be resealed with nitrogen flushing to prevent moisture absorption (>0.1% moisture affects processing).
B2B Procurement Guide
Industrial buyers should request certified test reports including Xenon arc weathering (ISO 4892-2), hydrolysis resistance (ISO 1817), and dynamic fatigue tests. Minimum order quantities typically range from 500kg-1 ton for custom formulations. For injection molding applications, verify the material's melt flow index (MFI) compatibility with your equipment. Leading manufacturers include Lubrizol, BASF, and Wanhua Chemical. Sample testing is strongly advised to confirm colorfastness and mechanical retention after accelerated aging.
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