• Product Overview: UV-329 (CAS 3147-75-9)

    UV-329 (Octrizole) is a high-performance benzotriazole-class ultraviolet light absorber. It is chemically 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol. This product provides efficient absorption of UV radiation in the 300–400 nm range, converting it into harmless heat energy through a photophysical mechanism [citation:1][citation:7][citation:9]. It is characterized by its high purity, excellent thermal stability, low volatility, and minimal color contribution, making it especially suitable for transparent and light-colored products

    Property Typical Value

    Appearance White to off-white crystalline powder

    Purity ≥99.0%

    Melting Point 103 – 106°C (typical range 103-105.3°C)

    Loss on Drying ≤ 0.5%

    Ash Content ≤ 0.1%

    Transmittance (440 nm) ≥97.0%

    Transmittance (500 nm) ≥98.0%

    Solubility & Compatibility Profile

    Parameter Details

    Solubility (20°C g/100g) Soluble in benzene, styrene, ethyl acetate, toluene; slightly

    soluble in ethanol; insoluble in water

    Polymer Compatibility PC, PVC, PS, PMMA, ABS, Polyesters, PE, PP, PU, PA,

    Epoxy, EVA

    Recommended Dosage PC: 0.15-0.3%; PVC: 0.2-0.5%; Coatings: 1.0-3.0%;

    PU: 0.3-1.0%; Unsaturated Polyester: 0.2-0.4%

  • Performance Advantages
    High Purity & Transparency: Minimal color contribution; ideal for colorless, transparent, and light-colored products
    Excellent Thermal Stability: TGA shows 5% weight loss at 220°C; suitable for high-temperature processing of engineering plastics
    Broad UV Absorption: Efficiently absorbs 300–400 nm (UV-A and UV-B)
    Good Solubility & Compatibility: Soluble in organic solvents, compatible with wide range of polymers.
    Low Volatility: Minimal loss during high-temperature processing
    UV-329 is utilized across diverse sectors requiring UV protection with minimal color impact
    Polycarbonate (PC) sheets & moldings
    PVC profiles & rigid films
    Polystyrene (PS) & ABS
    PMMA (acrylic) sheets
    Polyester (PET/PBT) engineering plastics
    Polyurethane (PU) elastomers
    Coatings & industrial paints
    Adhesives & sealants
    Optical lenses & frames
    Automotive interior parts
    Primary Applications

    Polycarbonate (PC): UV-329 is particularly recommended for PC, effectively preventing yellowing and maintaining optical clarity [citation:7][citation:9]. It is used in automotive glazing, headlamp lenses, and optical media.

    Coatings & Adhesives: In industrial coatings and adhesives, UV-329 provides excellent protection against UV-induced degradation, gloss loss, and delamination [citation:2][citation:9].

    Engineering Plastics: Suitable for high-temperature processed plastics like PC, PA, PBT, and PET, maintaining mechanical properties during outdoor exposure
    Storage Conditions
    Store in original sealed container in a cool, dry, well-ventilated area .
    Keep away from direct sunlight, heat sources, and oxidizing agents .
    Recommended temperature: 5-25°C, relative humidity <60%].
    Shelf life: 24 months from manufacture date when stored properly . (Some suppliers specify 12 months )
    Standard Packaging
    20 kg carton or fiber drum with inner PE liner
    25 kg carton or cardboard box
    Industrial & Wood Coatings
    UV-292 is used in wood coatings, anti-corrosive coatings, and general industrial finishes to maintain appearance and prolong service life .
    Standard Packaging
    25 kg plastic drum .
    180-200 kg plastic-lined iron drum .

  • Frequently Asked Questions (FAQ)

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