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    ChemicalBook >> CAS DataBase List >>Octabenzone


    CAS No.
    Chemical Name:
    UV-531;BP-12;uv1;531;CHIMASSORB 81;BENZOPHENONE-12;2-HYDROXY-4-(OCTYLOXY)BENZOPHENONE;uf4;Hostavin ARO 8;UV absorber 531
    Molecular Formula:
    Molecular Weight:
    MDL Number:
    MOL File:
    MSDS File:
    Last updated:2023-11-16 17:07:08

    Octabenzone Properties

    Melting point 47-49 °C(lit.)
    Boiling point 424.46°C (rough estimate)
    Density 1.160g/cm3
    refractive index 1.6000 (estimate)
    Flash point 102℃
    storage temp. Sealed in dry,Room Temperature
    solubility Chloroform (Slightly), Methanol (Slightly, Sonicated)
    form Solid
    pka 7.59±0.35(Predicted)
    color Off-White to Light Yellow
    Specific Gravity 1.160
    Merck 14,6742
    BRN 1915198
    LogP 7.360 (est)
    CAS DataBase Reference 1843-05-6(CAS DataBase Reference)
    Indirect Additives used in Food Contact Substances 2-HYDROXY-4-N-OCTOXY-BENZOPHENONE
    FDA 21 CFR 178.2010
    EWG's Food Scores 2
    FDA UNII 73P3618V2E
    NIST Chemistry Reference Octabenzone(1843-05-6)
    EPA Substance Registry System 2-Hydroxy-4-octyloxybenzophenone (1843-05-6)


    Risk and Safety Statements

    Symbol(GHS)  GHS hazard pictograms
    Signal word  Warning
    Hazard statements  H317
    Precautionary statements  P280
    Hazard Codes  Xi,N
    Risk Statements  36/37/38-50/53-43
    Safety Statements  26-36-61-60-36/37
    RIDADR  UN 3077 9/PG 3
    WGK Germany  1
    RTECS  DJ1595000
    TSCA  Yes
    HS Code  29145090
    Toxicity LD50 oral in rat: > 10gm/kg
    NFPA 704
    0 0

    Octabenzone price More Price(22)

    Manufacturer Product number Product description CAS number Packaging Price Updated Buy
    Sigma-Aldrich 413151 2-Hydroxy-4-(octyloxy)benzophenone 98% 1843-05-6 100g $71.5 2023-06-20 Buy
    TCI Chemical H0288 2-Hydroxy-4-n-octyloxybenzophenone >98.0%(GC) 1843-05-6 25g $22 2023-06-20 Buy
    TCI Chemical H0288 2-Hydroxy-4-n-octyloxybenzophenone >98.0%(GC) 1843-05-6 500g $136 2023-06-20 Buy
    Alfa Aesar L11750 2-Hydroxy-4-n-octyloxybenzophenone, 99% 1843-05-6 25g $17.9 2021-12-16 Buy
    Alfa Aesar L11750 2-Hydroxy-4-n-octyloxybenzophenone, 99% 1843-05-6 100g $35.4 2021-12-16 Buy
    Product number Packaging Price Buy
    413151 100g $71.5 Buy
    H0288 25g $22 Buy
    H0288 500g $136 Buy
    L11750 25g $17.9 Buy
    L11750 100g $35.4 Buy

    Octabenzone Chemical Properties,Uses,Production


    Octabenzone is a UV absorber/screener. It is used to protect polymers (e.g., polyethylene, polypropylene, polyvinylchloride) against damage by UV light. Colorless crystals; Light yellow powder.
    Stable under recommended storage conditions.


    UV Absorber 531 is an ultraviolet light absorber (UVA) of the benzophenone class, imparting good light stability when used in combination with a hindered amine light stabilizer (HALS) of the Chimassorb, Tinuvin® or Uvinul® range. It shows good compatibility with polyolefins and plasticized PVC.


    The main application of UV Absorber 531 is in combination with a HALS the
    light stabilization of low density and linear low density polyethylene as well
    as ethylene-vinyl acetate copolymers for agricultural films. It can be used as
    well as a UV barrier to protect the contents of packages for both industrial
    and consumer applications. Also, in combination with HALS, UV Absorber 531
    can be used in high density polyethylene molded articles, e. g. in crates.
    UV Absorber 531 also protects a number of other polymers against degradation
    caused by light exposure such as plasticized PVC and rubbers.
    UV Absorber 531 can be used in combination with antioxidants, phosphites
    and other light stabilizers.

    Physical properties

    Physical properties of Octabenzone


    Adsorbents and absorbents;
    Paint additives and coating additives not described by other categories
    Processing aids, not otherwise listed
    Air Care Products
    Building/Construction Materials not covered elsewhere
    Fabric, Textile, and Leather Products not covered elsewhere
    Furniture and Furnishings not covered elsewhere
    Paints and Coatings
    Plastic and Rubber Products not covered elsewhere


    UV Absorber 531 is particularly suitable for thick films, typically > 100 μm and thick sections. The low vapor pressure of UV Absorber 531 prevents losses during processing. Low migration rates reduce the risk of blooming.

    Analytic Laboratory Methods

    Migration of photo stabilizers from plastics was studied in model elution expt where the plastics were placed at different temp 20 and 45 degree in different solvents, e.g. H2O, acetic acid,  sunflower oil, heptane, and the amt of photostabilizer eluted was determined by spectrophotometry and by gas chromatography. The elution of 2-hydroxy-4-n-octyloxybenzophenone depended on the type of plastic. Elution was low in polystyrene and high in polyolefins, polyethylene. Food contamination from these plastic additives is discussed.

    Guidelines for use

    Guidelines for use

    Handling & Safety

    In accordance with good industrial practice, handle with care and avoid
    unnecessary personal contact. Avoid continuous or repetitive breathing of
    dust. Use only with adequate ventilation. Protect skin. Avoid dust formation
    and ignition sources.
    For more detailed information please refer to the material safety data sheet.


    1. https://pubchem.ncbi.nlm.nih.gov/compound/Octabenzone#section=U-S-Exports
    2. https://en.wikipedia.org/wiki/Octabenzone


    Octabenzone appears as light yellow/yellowish crystals/fine powder and is odourless and freely soluble in benzene, n-hexane, and acetone; slightly soluble in ethanol; and very slightly soluble in ethane dichloride. Octabenzone is a light stabiliser with good performance, capable of absorbing the UV radiation of 240–340 nm wavelength with the characteristics of light colour, non-toxicity, good compatibility, small mobility, easy processing, etc. Octabenzone protects the polymer to its maximum extent and helps to reduce its colour. It can also delay the yellowing and impede the loss of its physical function. Industrial applications of octabenzone is very extensive and applied to PE, PVC, PP, PS, PC, organic glass, polypropylene fibre, ethylene-vinyl acetate, etc. Also, octabenzone has very good light-stability effect on drying phenol aldehyde, varnish of alcohol and acname, polyurethane, acrylate, expoxnamee, etc. The major uses include UV stabiliser, for example, polyethylene and polypropylene fibres.

    Chemical Properties

    Light yellow powder


    HOBPs are UV absorbers for insulating plastics, which can be incorporated with active layers to increase the stabilization of organic solar cells (OSCs). It may be incorporated in parylene C films to enhance the light stability, which can be potentially used as a moisture transfer membrane for electronic boards and photovoltaics.


    To stabilize polyethylene against deterioration by ultraviolet light.


    Preparation by reaction of n-octyl chloride with 2,4-di-hydroxybenzophenone,
    in the presence of a mixture of sodium carbonate, triethylamine and potassium iodide in refluxing butanol for 15 h (90%); 
    in the presence of potassium carbonate in cyclohexanone at 145° for 5 h (66%);
    in the presence of potassium hydroxide and antimony triiodide in diethylene glycol at 150° for 1 h (93%);
    in the presence of sodium bicarbonate and potassium iodide in 1-methylpyrrolidone for 2 h at 150° (96%).


    ChEBI: Octabenzone is a member of benzophenones.

    General Description

    2-Hydroxy-4-(octyloxy)benzophenone (HOBP) is a UV based absorber that has 2-hydroxybenzophenone as a functional group. It can be used to enhance the light fastness of polymers using UV absorbers with sulfur and phosphorus compounds.

    Flammability and Explosibility

    Not classified

    Synthesis of Octabenzone from 2,4-Dihydroxybenzophenone and 1-Chlorooctane
    Global( 566)Suppliers
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    Qingdao Truelight functional Material Technology Co., Ltd.
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    View Lastest Price from Octabenzone manufacturers

    Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
    US $0.00 / KG 1drums 98.0% 1000TON Qingdao Truelight functional Material Technology Co., Ltd.
    Octabenzone pictures 2023-11-16 Octabenzone
    US $0.00-0.00 / kg 1kg 99% 1000000 Hebei Jingbo New Material Technology Co., Ltd
    Octabenzone  UV-531  pictures 2023-09-08 Octabenzone UV-531
    US $6.80 / kg 1kg 99 1500ton/year Hebei Yanxi Chemical Co., Ltd.
    • Octabenzone pictures
    • Octabenzone
    • US $0.00-0.00 / kg
    • 99%
    • Hebei Jingbo New Material Technology Co., Ltd
    [2-Hhydroxy-4-(octyloxy)phenyl]phenylmethanone 2-HYDROXY-4-N-OCTOXYBENZOPHENONE 2-HYDROXY-4-(OCTYLOXYL)-BENZOPHENONE Octabenzone (2-hydroxy-4-(octyloxy)phenyl)phenyl-methanon aduvex248 advastab46 anti-uvp Benzon OO benzonoo Benzophenone, 2-hydroxy-4-(octyloxy)- biosorb130 carstab700 Cyasorb UV 531 cyasorbuv531 UltravioletabsorbentUV-531 UV 1 uv1(ultrovioletabsorber) uva1 Uvinul 408 uvinul408 uvinulm408 (2-hydroxy-4-octoxy-phenyl)-phenyl-methanone (2-hydroxy-4-octoxyphenyl)-phenylmethanone UV-531,BP-12 UV-531(2-Hydroxy-4-n-octyloxybenzophenone) Hydroxy-4-(octyloxy)benzoph Ultraviolet Absorbent UV-531(BP-12) 2-hydroxy -4-octylethoxybenzophenonetwo 2-Hydroxy-4-n-octyloxybenzophenone , 98.0%(GC&T 2-Hhydroxy-4-(octyloxy)phenyl]phenylmethanone UV-531 2-Hydroxy-4-n-octoybenzophenone(BP-12) (2-hydroxy-4-(octyloxy)phenyl)phenylmethanone [2-Hydroxy-4-(octyloxy)phenyl]phenyl- [2-hydroxy-4-(octyloxy)phenyl]phenyl-methanon [2-Hydroxy-4-(octyloxy)phenyl]phenylmethanone [2-hydroxy-4-(octyloxy)phenyl]phenyl-Methanone 2-Benzoyl-5-(Octyloxy)phenol 2-benzoyl-5-octyloxyphenol 2-Hydroxy-4-(octoxy)benzophenone 2-hydroxy-4-(octyloxy)-benzophenon 2-hydroxy-4-0ctyloxybenzophenone 2-hydroxy-4-octoxybenzophenone 2-Hydroxy-4-oktyloxybenzofenon 4-(n-Octyloxy)-2-hydroxybenzophenone 4-(Octoxy)-2-hydroxybenzophenone 4-(Octyloxy)-2-hydroxybenzophenone 4-n-octyloxy-2-hydroxybenzophenone 4-octoxy-2-hydroxybenzophenone 4-octyloxy-2-hydroxybenzophenone Lankromark LE285 Lowilite 22 mark1413 Methanone, [2-hydroxy-4-(octyloxy)phenyl]phenyl- Octabenzon rhodialuxp sanduvor3035 seikalizere
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