Overview
Toughened grade PC is a modified form of polycarbonate engineered to withstand high-impact stresses while retaining the material's intrinsic clarity, heat resistance, and dimensional stability. It is produced by blending standard PC with elastomers or other impact modifiers, resulting in a material ideal for demanding environments. Common trade names include Lexan™ EXL (SABIC) and Makrolon® AG (Covestro). Unlike standard PC, toughened variants exhibit reduced brittleness at low temperatures, making them suitable for outdoor or automotive applications where thermal cycling occurs.
Physical and Chemical Properties
Toughened PC typically maintains a tensile strength of 55–75 MPa and an elongation at break of 80–150%, significantly higher than unmodified PC. Its Notched Izod impact strength often exceeds 500 J/m, even at subzero temperatures. The material retains polycarbonate’s resistance to dilute acids, alcohols, and hydrocarbons but remains susceptible to strong alkalis and certain solvents like acetone. UV-stabilized grades are available for outdoor use, mitigating yellowing and degradation.
Main Applications
In the automotive industry, toughened PC is used for bumper components, interior trim, and headlight lenses due to its crashworthiness and optical clarity. Electronics manufacturers employ it for smartphone cases, power tool housings, and connectors requiring drop resistance. Medical applications include surgical instrument handles and sterilization-compatible devices. Industrial uses encompass safety goggles, machine guards, and glazing where shatter resistance is critical.
Safety and Storage
While non-toxic in solid form, processing toughened PC above 300°C may release bisphenol A (BPA) vapors, requiring adequate ventilation. Dust from machining should be controlled to avoid respiratory irritation. Storage recommendations include sealing bags to prevent moisture absorption (which can cause hydrolysis during molding) and avoiding direct sunlight to preserve mechanical properties. Shelf life typically exceeds 12 months under proper conditions.
B2B Procurement Guide
When sourcing toughened PC, prioritize suppliers providing technical datasheets with verified impact test results (e.g., ASTM D256). Key specifications to confirm include melt flow rate (MFR) for processing compatibility and regulatory certifications like RoHS or REACH. For cost efficiency, consider bulk purchasing (palletized or truckload quantities), which may reduce per-unit prices by 10–20%. Sample testing is advised to evaluate batch consistency, especially for color-matched or flame-retardant grades.
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