Overview
Styrene-Acrylonitrile Copolymer (SAN) is a thermoplastic polymer composed of styrene and acrylonitrile monomers. It is known for its excellent transparency, rigidity, and resistance to chemicals and UV light. SAN is commonly used as a cost-effective alternative to more expensive transparent plastics like polycarbonate. SAN is produced through a free-radical polymerization process, which allows for precise control over its properties. The ratio of styrene to acrylonitrile can be adjusted to meet specific application requirements, making it a versatile material for various industries.
Physical and Chemical Properties
SAN copolymer exhibits a unique combination of physical and chemical properties that make it suitable for diverse applications. It has a high glass transition temperature (Tg) of around 100-120°C, ensuring stability under moderate heat. Its transparency is comparable to polystyrene, but with improved chemical resistance. The material is resistant to many household chemicals, including detergents and oils, but can be attacked by strong solvents like ketones and esters. SAN also has good dimensional stability and low moisture absorption, which is critical for precision parts in electronics and automotive applications.
Main Applications
Due to its clarity and durability, SAN is widely used in consumer goods such as kitchenware, cosmetic containers, and disposable cutlery. In the automotive industry, it is employed for instrument panels, light covers, and other interior components where transparency is required. SAN is also found in medical devices, packaging materials, and electronic housings. Its ability to be easily processed through injection molding and extrusion makes it a favorite for manufacturers seeking efficient production of complex shapes.
Safety and Storage
While SAN is generally considered safe for most applications, proper handling is essential to minimize risks. Workers should use personal protective equipment (PPE) such as gloves and masks to avoid exposure to dust during machining or processing. Storage conditions should be dry and cool, ideally below 30°C, to prevent degradation. SAN pellets are hygroscopic and should be kept in sealed containers to avoid moisture absorption, which can affect processing and final product quality.
B2B Procurement Guide
When procuring SAN copolymer, buyers should prioritize suppliers who provide detailed technical data sheets (TDS) and material safety data sheets (MSDS). These documents ensure compliance with safety regulations and help verify the material's properties. Price negotiations should consider factors like order volume, delivery terms, and additional services like custom compounding. Buyers are advised to request samples for testing before large-scale purchases to confirm the material meets their specific requirements.
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