Overview
Medium viscosity PC virgin material is an unprocessed, high-purity polycarbonate resin with balanced flow characteristics for injection molding and extrusion. Unlike recycled PC, it offers consistent mechanical properties and meets strict industry standards for clarity and durability. As a thermoplastic polymer, it combines the advantages of glass-like transparency with the toughness of engineering plastics. Its medium viscosity (typically 10-50 g/10min MFI) makes it suitable for complex molds while maintaining high dimensional stability.
Physical and Chemical Properties
This PC grade exhibits a light transmittance of 88-91%, rivaling glass, with a refractive index of 1.584. Its notched Izod impact strength exceeds 600 J/m, outperforming most transparent plastics. The material retains properties between -40°C to 135°C with a UL94 V-0 flame rating. Chemically, it resists dilute acids, oils, and alcohols but is susceptible to strong alkalis and aromatic hydrocarbons. Hydrolytic stability requires proper drying (≤0.02% moisture) before processing to prevent molecular weight degradation.
Main Applications
In automotive sectors, it's used for headlamp lenses, sunroof panels, and dashboard components due to crash resistance and weatherability. Electronics manufacturers employ it for smartphone cases, LED diffusers, and transparent EMI shielding. The medical industry values its gamma radiation stability for sterilization-compatible devices like IV connectors. Emerging uses include 5G antenna covers requiring signal transparency and impact resistance.
Safety and Storage
PC pellets are generally safe at room temperature but release bisphenol A (BPA) above 300°C. Processing areas require ventilation to manage potential vapors. Workers should use PPE when handling hot material during molding operations. Storage requires double-layer moisture-proof packaging with desiccants. Opened bags should be resealed or transferred to dry containers. Shelf life exceeds 12 months in proper conditions, though retesting is advised for long-stored material.
B2B Procurement Guide
Specify viscosity range (e.g., MFI 15-25g/10min at 300°C/1.2kg) based on wall thickness of final products. For optical applications, request yellowing index (YI) <2 after 1000hrs QUV testing. Food-contact grades require FDA or EU 10/2011 compliance documentation. Bulk buyers (20+ tons) can negotiate 5-8% price reductions. Consider regional suppliers for logistics efficiency – Asian producers dominate capacity but European/North American sources offer shorter lead times. Always audit suppliers for ISO 9001 and UL certification.
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