Overview
Low/medium flow polycarbonate (PC) is a versatile thermoplastic polymer characterized by its moderate melt viscosity, which enables efficient processing via injection molding or extrusion. It bridges the gap between high-flow (easy processing) and low-flow (high mechanical strength) grades, offering a balance of manufacturability and performance. Polycarbonate is renowned for its exceptional clarity, impact resistance (comparable to some metals), and thermal stability up to 135°C. Developed in the 1950s, PC has become a cornerstone material in engineering plastics. Its low/medium flow variants are particularly favored for complex geometries requiring precise molding without sacrificing mechanical properties. The material is inherently flame retardant (UL94 V-2 rating) and can be modified with additives for enhanced UV resistance or glass reinforcement.
Physical and Chemical Properties
Low/medium flow PC exhibits a melt flow rate (MFR) of approximately 5–20 g/10 min (300°C/1.2 kg), making it less fluid than high-flow grades but easier to process than high-viscosity alternatives. Its amorphous structure contributes to optical clarity (up to 90% light transmission) and isotropic shrinkage during molding. The material’s glass transition temperature (Tg) is around 147°C, ensuring dimensional stability under moderate heat. Chemically, PC resists dilute acids, alcohols, and oils but is susceptible to strong alkalis, amines, and aromatic solvents. Hydrolysis can occur at high temperatures in humid environments, necessitating pre-drying (120°C for 4 hours) before processing. Its dielectric strength (~15 kV/mm) and low moisture absorption (<0.2%) make it suitable for electrical applications.
Main Applications
In the automotive industry, low/medium flow PC is used for headlamp lenses, interior trim, and connectors due to its impact resistance and ability to withstand temperature fluctuations. Electronics manufacturers leverage its electrical insulation and flame retardancy for smartphone casings, power tool housings, and LED diffusers. The medical sector employs PC in sterilizable devices like surgical instrument handles and dialysis filters, capitalizing on its biocompatibility (ISO 10993 compliant). Optical applications include safety goggles and camera lenses, where clarity and scratch resistance are critical. Grades with added UV stabilizers are deployed in outdoor signage and glazing.
Safety and Storage
While polycarbonate is non-toxic in its solid form, processing at high temperatures may release trace bisphenol A (BPA) or phenol vapors, requiring adequate ventilation. Dust inhalation during pellet handling should be minimized using NIOSH-approved respirators. Spills pose minimal environmental risk but should be collected to prevent slipping hazards. Storage recommendations include keeping pellets in moisture-proof packaging at <30°C and <60% relative humidity. Prolonged UV exposure can yellow the material; UV-stabilized grades or opaque containers are advised for outdoor storage. Recycled PC must be tested for degradation, as repeated thermal processing reduces molecular weight and mechanical properties.
B2B Procurement Guide
When sourcing low/medium flow PC, specify the required MFR range (e.g., 10 g/10 min) to match your molding equipment. Verify certifications such as FDA (for food contact), UL 94 (flammability), and RoHS/REACH compliance. For optical applications, request haze (<1%) and yellowness index data. Suppliers typically offer pellets in 25 kg bags or bulk containers. MOQs vary from 500 kg to full truckloads (20+ tons), with prices fluctuating based on crude oil markets. Consider regional producers (e.g., Covestro, SABIC) for shorter lead times. Request technical datasheets with ISO 1133 (MFR), ASTM D256 (impact strength), and ASTM D648 (heat deflection temperature) test results.
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