Overview
Flame retardant PC is an engineered thermoplastic combining polycarbonate's mechanical strength with added fire resistance. Modified with halogenated or halogen-free additives, it achieves UL94 V-0 flammability ratings while maintaining >85% light transmission in transparent grades. Developed in the 1980s for aerospace applications, it now serves industries prioritizing safety and durability. The material undergoes rigorous testing including glow-wire ignition (GWI) and comparative tracking index (CTI) assessments. Leading producers like Covestro and SABIC offer grades tailored for injection molding, extrusion, or thermoforming processes, with some formulations achieving 5VA ratings for thick-section parts.
Physical and Chemical Properties
FR-PC retains polycarbonate's core characteristics: tensile strength of 55-75 MPa, notched Izod impact resistance of 600-900 J/m, and heat deflection temperatures (HDT) up to 140°C at 1.82 MPa. Flame retardancy is achieved through brominated compounds (tetrabromobisphenol-A) or phosphorus-based systems, reducing peak heat release rates by 40-60% versus standard PC. Chemically, it resists dilute acids, oils, and alcohols but may stress-crack in ketones or aromatic hydrocarbons. Electrical properties include dielectric strength of 15-20 kV/mm and volume resistivity >1016 Ω·cm. Environmental stress cracking resistance (ESCR) is improved in newer halogen-free formulations.
Main Applications
Over 60% of FR-PC is used in electrical/electronic components including switchgear housings (IEC 61439 compliance), LED diffusers, and server rack parts. Automotive applications comprise EV battery modules (meeting GB38031-2020 standards) and interior trim with FMVSS302 flame resistance. In construction, it's specified for stadium roofing and public transport interiors where smoke density requirements apply. Emerging uses include 5G antenna covers requiring both RF transparency and fire safety. Medical variants with biocompatible retardants are employed in ICU equipment housings. Transparent grades dominate the protective glazing market, offering bullet resistance without compromising fire ratings.
Safety and Storage
While FR-PC itself is non-toxic, thermal decomposition above 300°C can release hydrogen bromide (from halogenated grades) or phosphine oxides. Processing should occur in ventilated areas with fume extraction. NFPA 704 ratings are typically Health: 1, Flammability: 1 (self-extinguishing), Reactivity: 0. Storage requires double-sealed moisture-proof packaging (<0.02% water content) to prevent hydrolysis degradation. Bulk pellets should be used within 12 months; regrind material must be reprocessed below 15% blend ratio to maintain flame performance. Spills require no special cleanup beyond standard plastic protocols.
B2B Procurement Guide
Key specifications to request include: UL file number (E-number), glow wire flammability index (GWFI), and CTI value for electrical applications. For EU markets, verify REACH compliance regarding SVHCs in additive packages. Halogen-free grades typically cost 20-30% more but avoid RoHS restrictions. Minimum order quantities range from 500kg for standard grades to 10-ton commitments for custom formulations. Lead times average 4-6 weeks for Asia-sourced material. Third-party testing certificates (SGS, TÜV) should specify batch-to-batch consistency in flame performance. Consider post-consumer recycled content options meeting the same fire ratings.
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