Chemical Resistant Polycarbonate
Overview
Chemical-resistant polycarbonate (PC) is a specialized thermoplastic engineered to endure prolonged exposure to aggressive solvents, acids, and alkalis without degradation. Unlike standard PC, it incorporates additives or copolymer structures to enhance inertness. Its balance of mechanical robustness (e.g., impact resistance up to 850 J/m) and chemical stability makes it ideal for demanding environments. Common grades include ISO-certified variants for medical and food-contact applications. Manufacturers often provide custom formulations to target specific solvents like acetone or hydrocarbons. The material’s optical clarity (up to 90% light transmission) is retained in many grades, enabling use in sight glasses or protective barriers.
Physical and Chemical Properties
This PC variant maintains core properties of general polycarbonate—notably, a tensile strength of 55–75 MPa and a service temperature range of -40°C to 135°C. Its chemical resistance is achieved through molecular modifications that reduce susceptibility to swelling or cracking. Testing standards (e.g., ASTM D543) confirm resistance to alcohols, diluted acids, and aliphatic hydrocarbons. Key differentiators include low moisture absorption (<0.2%) and hydrolytic stability, critical for wet chemical environments. However, concentrated sulfuric acid or strong bases may cause surface etching. UV-stabilized grades are available for outdoor use, though prolonged exposure to chlorinated solvents should be avoided.
Main Applications
In laboratories, chemical-resistant PC is used for fume hood windows, centrifuge parts, and solvent storage bottles due to its clarity and non-reactivity. The medical field employs it for surgical instruments, dialysis housings, and sterilization-compatible devices (autoclavable grades exist). Industrial uses include chemical pump components, protective goggles, and process equipment liners. Its electrical insulation properties (dielectric strength ~15 kV/mm) also suit it for junction boxes in corrosive environments. Increasingly, it replaces glass in safety-critical applications where breakage risks exist.
Safety and Storage
While inherently safer than many alternatives, proper handling is essential. Processing (e.g., injection molding) should occur below 300°C to prevent thermal decomposition releasing bisphenol A (BPA) traces. Use local exhaust ventilation during machining to avoid airborne particles. Storage recommendations include keeping sheets or pellets in original packaging to prevent UV degradation. Avoid contact with strong oxidizers (e.g., nitric acid) or amines, which can cause stress cracking. Fire-retardant grades (UL94 V-0 rated) are advised for electrical applications.
B2B Procurement Guide
Buyers should specify required chemical resistance profiles (e.g., ASTM D543 test data for target solvents). Medical-grade purchases demand USP Class VI or ISO 10993 certifications. For optical applications, clarify haze (<1% preferred) and yellowness index thresholds. Suppliers often provide samples for immersion testing. Bulk orders (20+ metric tons) may attract 5–15% discounts. Consider regional logistics—PC is hygroscopic and should be shipped with desiccants. Leading manufacturers include Covestro, SABIC, and Mitsubishi Engineering-Plastics.
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