UV Absorber 326: Applications, Specifications and Supplier Guide

Chemical Properties

• CAS: 3896-11-5 | MW: 323.4 g/mol | MP: 137–141°C
• UV absorption maximum: ~340 nm
• Appearance: Light yellow to yellow powder or granules
• Commercial equivalents: Tinuvin 326 (BASF), Chisorb 326

How It Works

UV Absorber 326 absorbs UV radiation (280–380 nm) and converts it to harmless heat via intramolecular proton transfer. The compound then returns to its ground state ready to absorb again — effectively a catalytic UV filter.

Applications

• PP/PE: Automotive, agricultural film, packaging with UV exposure
• ABS/HIPS: Electronics housings, outdoor furniture, garden products
• Rigid PVC: Window profiles, pipe fittings, cladding
• Coatings: Solvent-borne and water-borne industrial topcoats, printing inks
• Rubber: EPDM, SBR, natural rubber outdoor applications

UV 326 vs UV 327 vs UV 328

• UV 326 (MW 323): Cost-effective, broad polymer compatibility
• UV 327 (MW 358): Higher MW, lower volatility, similar applications
• UV 328 (MW 351): Different substitution, favoured in coatings and engineering polymers

Typical Usage Levels

• Polyolefins: 0.1–0.5% | ABS/PVC: 0.2–0.5% | Coatings: 0.5–2.0%
• Combine with HALS at 1:1 to 1:2 ratio for outdoor applications

Key Sourcing Specifications

• Purity: ≥99.0% | MP: 137–141°C | Transmittance (1% acetone/500 nm): ≥97%
• Ash: ≤0.1% | Loss on drying: ≤0.5%
• Packaging: 25 kg fiber drum with poly lining

FAQ

Is UV 326 food-contact compliant?
Listed in EU Plastics Regulation 10/2011 with SML 1.5 mg/kg. Verify FDA status per specific application. Request regulatory documentation from supplier.

Contact SUNCHEM

Request UV Absorber 326 samples with full COA, SDS, and regulatory compliance documentation. Contact SUNCHEM.