Overview
Medium viscosity polycarbonate (PC) is a thermoplastic polymer prized for its balanced flow characteristics during injection molding or extrusion. It bridges the gap between low-viscosity (easy-flow) and high-viscosity (high-strength) grades, making it suitable for complex geometries requiring both precision and durability. Developed in the 1950s, PC revolutionized industries needing transparent, impact-resistant materials. Its molecular structure features carbonate groups linked by bisphenol-A units, contributing to its unique properties. Medium viscosity PC is particularly favored for applications demanding a compromise between ease of processing and mechanical performance, such as thin-walled components or parts with fine details.
Physical and Chemical Properties
Medium viscosity PC typically exhibits a melt flow index (MFI) of 10–20 g/10 min (300°C/1.2 kg), indicating moderate flow under processing conditions. Its glass transition temperature (Tg) ranges from 145–150°C, ensuring dimensional stability below this threshold. The material maintains 85–90% light transmission in transparent grades, with a refractive index of ~1.585. Chemically, PC resists dilute acids, oils, and alcohols but is susceptible to strong alkalis and aromatic hydrocarbons. Hydrolytic stability is moderate; prolonged exposure to high-temperature water or steam can cause gradual degradation. UV-resistant grades incorporate stabilizers to mitigate yellowing outdoors.
Main Applications
In automotive manufacturing, medium viscosity PC is used for instrument panels, headlight lenses, and sunroof components due to its impact resistance and clarity. Electronics manufacturers employ it for smartphone cases, laptop housings, and transparent protective covers, benefiting from its dielectric properties and flame-retardant variants (e.g., UL94 V-0 rated). The medical field utilizes sterilizable PC for surgical instrument handles, dialysis housings, and IV connectors. Industrial applications include safety goggles, machine guards, and glazing where shatter resistance is critical. Recent innovations include PC blends with ABS or polyester for enhanced chemical resistance or reduced costs.
Safety and Storage
PC pellets are generally safe to handle but may generate dust during transportation or loading. Use PPE (gloves, goggles) to prevent eye/skin irritation from fine particles. Process emissions above 300°C may release trace bisphenol-A; ensure adequate ventilation in molding areas. Storage requires moisture-proof packaging to prevent hydrolysis. Optimal conditions include relative humidity below 50% and temperatures under 30°C. Pre-drying at 120°C for 4 hours is recommended before processing to eliminate absorbed moisture, which can cause bubbling or strength reduction in finished products.
B2B Procurement Guide
When sourcing medium viscosity PC, verify the supplier’s certification for ISO 9001 or equivalent quality systems. Key specifications to request include MFI (e.g., 15 g/10 min ±10%), yellowness index (<2 for optical grades), and regulatory compliance certificates (FDA 21 CFR, EU 10/2011 for food contact). For large-volume orders (20+ metric tons), negotiate bulk pricing with tiered discounts. Consider regional suppliers to reduce logistics costs—major producers are located in China, Germany, and the US. Sample testing should assess processability (e.g., spiral flow test) and end-use performance (impact strength per ASTM D256). Just-in-time delivery options help minimize inventory costs for manufacturers.
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