Overview
Acrylonitrile Styrene (AS) plastic is a thermoplastic copolymer derived from styrene and acrylonitrile monomers. It combines the clarity and processability of polystyrene with enhanced chemical resistance and thermal stability from acrylonitrile. First commercialized in the 1940s, AS is favored for applications requiring transparency, dimensional stability, and resistance to oils and household chemicals. Unlike general-purpose polystyrene, AS exhibits lower shrinkage during molding, making it suitable for precision parts. It is often used as a cost-effective alternative to polycarbonate (PC) or acrylic (PMMA) where extreme impact resistance is not required. The material is recyclable under resin identification code 7 ("Other").
Physical and Chemical Properties
AS plastic typically shows a light transmittance of 88–92%, comparable to PMMA but with better chemical resistance to alcohols and detergents. Its tensile strength ranges from 65–80 MPa, with a Rockwell hardness of M80–85. The material maintains stability up to 85–90°C continuously, though heat-resistant grades can withstand 100–110°C. Key limitations include brittleness below -20°C and susceptibility to stress cracking when exposed to certain solvents like acetone. Its low shrinkage rate (0.3–0.6%) reduces warping in injection-molded parts. UV-stabilized grades incorporate additives to prevent yellowing, extending outdoor usability to 5–7 years without significant degradation.
Main Applications
In automotive manufacturing, AS is used for interior lenses (dome lights, instrument panels) and exterior reflectors due to its clarity and weatherability. The food packaging industry employs AS for jars, containers, and cosmetic compacts where glass-like appearance is desired but weight reduction is critical. Medical applications include disposable cuvettes and syringe components, leveraging AS's gamma radiation resistance for sterilization. Consumer goods range from water filter housings to transparent appliance components. Recent innovations include antistatic grades for electronic housings and glass-fiber reinforced variants (20–30% GF) for structural parts requiring higher stiffness.
Safety and Storage
Fully polymerized AS is considered non-hazardous under normal use. However, residual acrylonitrile monomer (typically <0.1%) may require evaluation for food-contact applications per FDA or EU regulations. Dust generated during machining should be controlled via local exhaust ventilation. Storage recommendations include keeping materials in original packaging with desiccants to prevent moisture absorption (max 0.1% before processing). Pellets should not be exposed to temperatures above 50°C for extended periods to prevent agglomeration. Processors should dry AS at 70–80°C for 2–4 hours before molding to eliminate surface moisture.
B2B Procurement Guide
When sourcing AS plastic, buyers should specify: 1. Optical requirements (haze <1% for crystal-clear applications) 2. Regulatory compliance (FDA 21 CFR, EU 10/2011 for food contact) 3. Additive packages (UV stabilizers, impact modifiers) 4. Melt flow rate (MFR) matching processing methods (typically 5–30 g/10min at 220°C/10kg) Bulk shipments (25kg bags or 1-ton super sacks) commonly offer 5–15% cost savings versus small-quantity purchases. Asian suppliers dominate standard grades, while specialty formulations (medical, optical) are often sourced from EU/US producers. Lead times vary from 2 weeks for stock grades to 8 weeks for custom compounds.
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