• Product Overview: UV-P (CAS 2440-22-4)

    UV-P (2-(2H-benzotriazol-2-yl)-p-cresol) is a classic benzotriazole-type ultraviolet light absorber. It provides excellent protection for polymers by converting harmful UV radiation (particularly in the 300–400 nm range) into heat through a reversible proton transfer mechanism. Known for its strong absorption, good photostability, d compatibility with a wide range of substrates .

    Property Typical Value

    Appearance Off-white to light beige crystalline powder

    Purity >99%

    Melting 128 – 132°C (literature range)

    Molar Extinction Coefficient >15,000 L·mol⁻¹·cm⁻¹ (at 340 nm)

    Volatiles ≤ 0.5%

    Absorbance (UV) ~303 nm, ~340 nm (in ethanol)

    Loss on Drying ≤ 0.5%

    Parameter Details

    Solubility (20°C/100g) Toluene: 6; Ethyl acetate: 10; Acetone: 8; Methanol: 2; Insoluble in

    water .

    Polymer Compatibility PVC, PS, ABS, SAN, PMMA, unsaturated polyesters, cellulosics,

    polycarbonate (limited), coatings .

    Recommended Dosage 0.1% – 1.0% by weight (typical 0.2-0.6% for most applications) .

  • Performance Advantages
    High Extinction Coefficient: Strong UV absorption with minimal color contribution .
    Broad Compatibility: Works in PVC, polystyrene, polyesters, acrylics, polycarbonate, and coatings .
    Excellent Photostability: Does not degrade readily upon UV exposure; regenerates after energy dissipation .
    Low Volatility: Suitable for processing up to 250–280°C in many polymers .
    Synergistic with HALS: Often combined with hindered amine light stabilizers for enhanced durability .
    Applications & End-uses
    UV-P is utilized across diverse sectors requiring cost-effective UV stabilization with minimal color impact:
    Rigid & flexible PVC (profiles, siding)
    Polystyrene (PS) & impact copolymers
    ABS / SAN blends Polyester & epoxy coatings
    Acrylic (PMMA) sheets & moulding
    Polyurethane foams & elastomers
    Adhesives & sealants
    Textile fibers (cellulose acetate)
    Wood coatings & stains
    Photographic materials
    Building & Construction
    In PVC window profiles and siding, UV-P (often combined with a benzophenone or HALS) prevents discoloration and surface degradation, extending service life by 5–10 years .
    Coatings & Paints
    UV-P is widely used in clear and pigmented industrial coatings (automotive refinish, wood coatings) to protect the underlying substrate and maintain gloss .
    Standard Packaging
    20 kg fiber drum with inner PE liner .
    25 kg cardboard box (custom packaging available) .
    500 kg big bag (upon request) .
    Storage Conditions
    Store in original sealed container in a cool, dry, well-ventilated area .
    Keep away from direct sunlight, heat sources, and oxidizing agents .
    Shelf life: Minimum 36 months from manufacture date when stored properly .

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