Overview
Injection molding grade polyester elastomer (TPE-E) is a block copolymer combining rigid polyester segments with flexible polyether or polyester soft segments. This structure delivers a unique balance of toughness, elasticity, and processability, making it suitable for precision-molded parts. Unlike conventional rubbers, TPE-E can be processed using standard thermoplastic equipment, reducing production costs. It is particularly valued for its ability to withstand repeated flexing and exposure to harsh environments without losing mechanical integrity.
Physical and Chemical Properties
Polyester elastomers exhibit a Shore D hardness range of 30–72, with tensile strengths up to 50 MPa. Their low compression set (<30% at 70°C) ensures long-term sealing performance. The material retains flexibility at temperatures as low as -40°C and resists degradation up to 150°C. Chemically, TPE-E resists oils, fuels, and weak acids but may swell in polar solvents like ketones. Grades with UV stabilizers are available for outdoor use. The melt flow rate (MFR) typically ranges from 5–30 g/10 min (230°C/2.16 kg), facilitating easy injection molding.
Main Applications
Automotive applications dominate the market, including CVJ boots, airbag covers, and vibration dampers. The material’s oil resistance and fatigue life make it ideal for dynamic seals in transmissions. Industrial uses include conveyor belts, hydraulic hoses, and cable sheathing. In consumer goods, TPE-E appears in sports footwear midsoles and wearable device straps due to its lightweight and shock absorption. Medical-grade variants meet ISO 10993 standards for tubing and catheter components.
Safety and Storage
While TPE-E is non-hazardous under normal conditions, molten processing requires ventilation to manage potential fumes. Use nitrile gloves to prevent static-induced pellet scattering during handling. Storage recommendations include sealed moisture-barrier bags with desiccants. Prolonged exposure to humidity (>50% RH) can cause hydrolysis during processing. Pellets should be dried at 80–100°C for 2–4 hours before molding to prevent surface defects.
B2B Procurement Guide
Key specifications to confirm include hardness (ASTM D2240), tensile strength (ISO 527), and elongation at break. For color-critical applications, verify pellet consistency and pigment dispersion quality. Suppliers often provide technical datasheets with rheology curves for specific screw designs. MOQs typically start at 500 kg, with bulk discounts available for 20+ ton orders. Lead times vary from 2–8 weeks depending on customization (e.g., glass fiber reinforcement).
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