Overview
2-(2'-Hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, commonly known as UV-326, is a benzotriazole-based ultraviolet (UV) light absorber. It is widely used in industries to protect polymers from photodegradation caused by UV radiation. The compound is particularly effective in the 300-400 nm wavelength range, making it suitable for applications in plastics, coatings, and adhesives. Its chemical structure ensures high compatibility with various polymer matrices, contributing to its widespread adoption in manufacturing processes. UV-326 is favored for its ability to maintain material integrity under prolonged UV exposure. It is often incorporated into products such as automotive parts, packaging materials, and outdoor furniture to extend their lifespan. The compound's efficacy and stability have made it a standard choice for UV protection in many industrial applications.
Physical and Chemical Properties
UV-326 appears as a light yellow crystalline powder with a molecular weight of 315.8 g/mol. It has a melting point range of 137-141°C, indicating its suitability for high-temperature processing. The compound is soluble in common organic solvents like acetone and toluene but exhibits negligible solubility in water, which is typical for hydrophobic UV absorbers. One of the key properties of UV-326 is its excellent thermal stability, which allows it to withstand processing temperatures up to 300°C without significant degradation. This makes it ideal for use in extrusion and injection molding processes. Additionally, its low volatility ensures minimal loss during high-temperature applications, maintaining consistent performance over time.
Main Applications
UV-326 is primarily used as a UV stabilizer in polyolefins (e.g., polyethylene, polypropylene), PVC, and other polymers. It is also effective in coatings and adhesives, where it prevents yellowing and embrittlement caused by UV exposure. The automotive industry relies on UV-326 to protect interior and exterior plastic components from sun damage. In the packaging industry, this compound is added to films and containers to preserve the quality of contents sensitive to light. Synthetic fibers, such as those used in outdoor textiles, also benefit from UV-326's protective properties, ensuring color fastness and durability. Its versatility and effectiveness make it a critical additive in many UV-sensitive applications.
Safety and Storage
While UV-326 is generally considered safe for industrial use, proper handling precautions are necessary to minimize risks. Workers should avoid inhalation of dust and direct skin contact by using PPE such as gloves, masks, and safety goggles. The compound should be stored in a cool, dry place, away from direct sunlight and moisture, to maintain its stability and efficacy. Spills should be contained and cleaned up immediately using appropriate absorbent materials. Disposal must comply with local environmental regulations, as improper handling can lead to contamination. Manufacturers and suppliers typically provide Material Safety Data Sheets (MSDS) with detailed safety and storage guidelines.
B2B Procurement Guide
When procuring UV-326, B2B buyers should prioritize suppliers with certifications such as ISO 9001 or REACH compliance to ensure product quality and regulatory adherence. Key specifications to verify include CAS number (3896-11-5), purity (typically ≥98%), and batch consistency. Buyers should also request samples for testing UV absorption performance in their specific applications. Pricing varies based on quantity and purity, with bulk purchases often attracting discounts. Reliable suppliers usually offer technical support and documentation, including certificates of analysis (CoA) and MSDS. Buyers are advised to establish long-term relationships with reputable suppliers to ensure a steady supply of high-quality UV-326.
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