Overview
Black Polycarbonate (PC) is a high-performance thermoplastic polymer modified with carbon black pigment. This additive provides UV resistance and an opaque black appearance while maintaining the material's inherent strength and durability. Polycarbonate was first developed in the 1950s and has since become one of the most versatile engineering plastics. Black PC combines the excellent impact resistance of standard polycarbonate with improved weatherability, making it suitable for outdoor applications. The carbon black content typically ranges from 1-3%, sufficient to provide UV protection without significantly altering the material's mechanical properties.
Physical and Chemical Properties
Black PC exhibits exceptional impact strength - about 250 times that of glass and 30 times that of acrylic. Its tensile strength ranges from 55-75 MPa, with a heat deflection temperature of 130-140°C at 1.8 MPa. The material maintains good dimensional stability across a wide temperature range (-40°C to +120°C). The carbon black additive provides superior UV resistance compared to clear PC, with less than 5% loss in impact strength after extensive outdoor exposure. Chemically, black PC shows good resistance to dilute acids, aliphatic hydrocarbons, and alcohols, but may be attacked by strong bases and some chlorinated solvents.
Main Applications
In the automotive industry, black PC is used for headlamp housings, mirror housings, and interior trim components where both aesthetics and durability are required. The electronics sector utilizes it for device housings, power tool bodies, and electrical enclosures that need EMI shielding properties from the carbon content. Construction applications include roofing panels, noise barriers, and safety glazing where impact resistance and weatherability are critical. Other uses encompass medical device components, protective eyewear, and industrial machine guards where the combination of strength, heat resistance, and dimensional stability is essential.
Safety and Storage
While generally considered safe, black PC should be processed with adequate ventilation as thermal decomposition can release small amounts of bisphenol A and other byproducts. Proper handling equipment should be used when working with molten material to prevent thermal burns. For storage, black PC should be kept in its original packaging until use to prevent moisture absorption (which can cause processing defects). The material should be stored in a dry environment below 30°C, away from direct sunlight. Pellets typically have a shelf life of 12-24 months when properly stored.
B2B Procurement Guide
When sourcing black PC, specify key parameters including melt flow index (typically 5-30 g/10min for most applications), UV stabilization level, and any required certifications (UL94 flame ratings, FDA compliance for food contact, etc.). Consider whether you need general-purpose or high-flow grades for thin-wall molding. For large-volume purchases (over 20 metric tons), negotiate with manufacturers for bulk pricing. Smaller quantities can be sourced through distributors with a 15-30% premium. Lead times vary from 2-6 weeks depending on formulation requirements and order volume. Always request material test reports (MTRs) for critical applications.
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