Overview
High Impact Copolymer (HIC) is a thermoplastic material engineered by polymerizing propylene with ethylene-propylene rubber (EPR). This dual-phase structure grants it superior impact strength compared to standard polypropylene, while retaining processability. Developed in the 1970s, HIC is now a staple in industries requiring durability under mechanical stress. Its versatility stems from tunable rubber content (typically 5–30%), allowing customization for specific impact resistance levels. Manufacturers often compound HIC with additives like stabilizers or fillers to enhance UV resistance or stiffness for niche applications.
Physical and Chemical Properties
HIC exhibits a unique balance of rigidity (from the polypropylene matrix) and elasticity (from the EPR phase). Its notched Izod impact strength ranges from 5 to 15 kJ/m², outperforming homopolymer PP by 3–5 times. The material maintains dimensional stability up to 120°C and resists acids, alkalis, and most organic solvents. Thermogravimetric analysis (TGA) shows decomposition begins at 300°C, releasing hydrocarbons. HIC’s low density (0.9 g/cm³) makes it a lightweight alternative to metals or engineering plastics. Electrical insulation properties are comparable to standard PP, with a dielectric strength of 20–25 kV/mm.
Main Applications
Automotive components account for 40% of HIC usage, notably bumper fascias, battery casings, and interior trim. Its energy-absorbing properties meet crash safety standards while reducing vehicle weight. In packaging, HIC is molded into thin-walled containers for chemicals or cosmetics, leveraging its stress-crack resistance. Consumer goods like power tool housings and toy parts benefit from HIC’s drop durability. Recent innovations include food-grade HIC for microwaveable trays, where thermal stability and impact resistance are critical. Medical applications include syringe barrels that withstand accidental impacts during handling.
Safety and Storage
HIC pellets pose minimal health risks under normal handling but may generate respirable dust during grinding or machining. OSHA recommends P2-rated dust masks if airborne particles exceed 5 mg/m³. Processing above 200°C requires ventilation to avoid hydrocarbon fume exposure. Storage should prevent moisture absorption (max. 0.05% water content) to avoid processing defects. Bulk bags or sealed containers are ideal, with a shelf life of 12 months in <30°C environments. Incompatible materials include strong oxidizers like peroxides, which may degrade the rubber phase.
B2B Procurement Guide
Key specifications to evaluate include melt flow index (MFI: 10–50 g/10min for injection molding), rubber phase distribution (uniformity affects impact performance), and regulatory certifications (e.g., FDA, RoHS). Sample testing under ISO 180 (impact resistance) and ISO 527 (tensile strength) is advised. Suppliers typically offer compounded grades with pre-added UV stabilizers or flame retardants for niche markets. MOQs for global shipments range from 10–20 metric tons, with lead times of 4–6 weeks. Negotiate pricing tiers for annual contracts exceeding 500 tons. Logistics should avoid temperature extremes (>40°C) during transit to prevent pellet agglomeration.
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