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    ChemicalBook >> CAS DataBase List >>UV Absorber 326

    UV Absorber 326

    CAS No.
    Chemical Name:
    UV Absorber 326
    UV-326;BUMETRIZOLE;tinuvin;TINUVIN 326;Sumisorb 300;ULTRA-VIOLET ABSORBER UV-326;ULTRAVIOLET ABSORBENT UV-326;2-TERT-BUTYL-6-(5-CHLORO-2 H-BENZOTRIAZOL-2-YL)-4-METHYLPHENOL;2-(tert-Butyl)-6-(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)-4-Methylphenol;UV73
    Molecular Formula:
    Molecular Weight:
    MDL Number:
    MOL File:
    MSDS File:
    Last updated:2023-05-25 18:01:08

    UV Absorber 326 Properties

    Melting point 144-147 °C(lit.)
    Boiling point 460.4±55.0 °C(Predicted)
    Density 1.26±0.1 g/cm3(Predicted)
    vapor pressure 0Pa at 20℃
    storage temp. Sealed in dry,Room Temperature
    solubility Chloroform (Slightly), Ethyl Acetate (Slightly), Methanol (Slightly)
    pka 9.31±0.48(Predicted)
    form Solid
    color Pale Yellow to Light Yellow
    Water Solubility 4μg/L at 20℃
    InChI InChI=1S/C17H18ClN3O/c1-10-7-12(17(2,3)4)16(22)15(8-10)21-19-13-6-5-11(18)9-14(13)20-21/h5-9,22H,1-4H3
    SMILES C1(O)=C(C(C)(C)C)C=C(C)C=C1N1N=C2C=C(Cl)C=CC2=N1
    LogP 6.580 (est)
    Indirect Additives used in Food Contact Substances 2-(3'-TERT-BUTYL-2'-HYDROXY-5'-METHYL-PHENYL)-5-CHLOROBENZOTRIAZOLE
    CAS DataBase Reference 3896-11-5(CAS DataBase Reference)
    EWG's Food Scores 1
    FDA UNII 7ZF18Q354W
    EPA Substance Registry System 2-tert-Butyl-6-(5-chloro-2H-benzotriazol-2-yl)-p-cresol (3896-11-5)


    Risk and Safety Statements

    Symbol(GHS)  GHS hazard pictograms
    Signal word  Warning
    Hazard statements  H315-H319
    Precautionary statements  P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313
    Hazard Codes  Xi
    Risk Statements  36/37/38-53
    Safety Statements  26-36-61
    WGK Germany  1
    HS Code  29339900

    UV Absorber 326 price More Price(15)

    Manufacturer Product number Product description CAS number Packaging Price Updated Buy
    Sigma-Aldrich 422479 2-tert-Butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol 98% 3896-11-5 50g $74.8 2023-06-20 Buy
    TCI Chemical H0559 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol >98.0%(GC) 3896-11-5 25g $68 2023-06-20 Buy
    TCI Chemical H0559 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol >98.0%(GC) 3896-11-5 500g $211 2023-06-20 Buy
    TRC B689680 Bumetrizole 3896-11-5 50g $70 2021-12-16 Buy
    AK Scientific I706 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol 3896-11-5 1g $14 2021-12-16 Buy
    Product number Packaging Price Buy
    422479 50g $74.8 Buy
    H0559 25g $68 Buy
    H0559 500g $211 Buy
    B689680 50g $70 Buy
    I706 1g $14 Buy

    UV Absorber 326 Chemical Properties,Uses,Production


    UV Absorber 326 is a UV absorber of the hydroxyphenylbenzotriazole class, which imparts outstanding light stability to plastics and other organic substrates.

    Physical Properties


    UV Absorber 326 has a wide range of indirect food approvals in polyolefins. It has a low volatility at high temperatures and high resistance to thermal degradation and can therefore be used without significant loss or decomposition in the polyolefin compounding and molding processes. In the use for the UV protection of polyester resins, TINUVIN 326 does not form colored complexes with the metallic salts used for the curing process of these resins.


    UV Absorber 326 is especially suited for polyolefins and cold cured polyesters.

    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. Prevent contamination of the environment. Avoid dust formation and ignition sources. For more detailed information please refer to the material safety data sheet.

    Chemical Properties

    Pale Yellow Solid


    Bumetrizole,Onbio Inc.


    Bumetrizole is an intermediate reactant in the synthesis of UV light absorbers for polyester fibers.


    UV-326 can potentially be used as a UV light filter in cosmetics and sunscreens. It may also be used as a corrosion inhibitor for the protection of building materials and automobiles.

    Manufacturing Process

    To a 2000 ml 3-necked, round-bottomed flask equipped with an agitator, reflux condenser, nitrogen inlet and thermometer were charged 140.5 g of 2'- hydroxy-3'-t-butyl-5'-methyl-5-chloro-2-nitroazobenzene, 119 g of isopropanol and 80 g of Amsco mineral spirits. A stream of nitrogen was introduced over the surface of the contents of the flask and the nitrogen atmosphere was then maintained throughout the remainder of the reduction process. 13.7 g of 50% aqueous sodium hydroxide solution and 222 g of water were added and the temperature of the contents of the flask were adjusted to 55°C. The ratio of the moles of alkali to moles of o-nitroazobenzene intermediate used was is 0.848/1. 104 g of zinc dust was added in 5 portions over a 2 hours period with the temperature of the flask being held at 55-60°C with some slight external cooling. The total concentration of iron impurities from all reactants less than 150 ppm based on zinc used. After all the zinc was added, the temperature was raised to 60°C and held at this temperature until a spot test indicated no more o-nitroazobenzene intermediate was present. The temperature was then raised to 65°C and held there for 4 to 5 hours or until TLC analysis indicated that no more of the N-oxy-intermediate was present. 62.6 g of anhydrous sodium sulfate and 35.6 g of water were then added, the batch was heated to 70°C and stirred for 15 min. The material was then allowed to stand and separate into three liquid phases plus unreacted zinc dust. The top two layers containing the desired product were transferred to another flask. The remaining aqueous zinc slurry was washed at 65-70°C with three successive 16 g portions of Amsco mineral spirits: isopropanol 50:50. The combined product layers and wash liquids were then washed once at 70°C with an aqueous hydrochloric acid solution made from 130 g of water and 40 g of 32% hydrochloric acid to remove cleavage amine by-products. A second and third wash followed at 70°C with aqueous hydrochloric acid solutions made each from 65 g of water and 20 g of 32% hydrochloric acid. The last wash was essentially colorless. 14 g of 32% hydrochloric acid and 220 g of isopropanol were added to the solution of the product. The batch was allowed to crystallize slowly. The solid product form was filtered and washed with isopropanol at 0°C to give 110 g of 5-chloro-2-(2-hydroxy-3-t-butyl-5- methylphenyl)-2H-benzotriazole with a melting point of 140-141°C.

    Therapeutic Function

    Sunscreen agent

    General Description

    2-tert-Butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol (UV-326) is a benzotriazole based UV absorber that can be used in the photostabilization of industrial materials. It can absorb the harmful UV radiation for the wavelength of about 290 nm.

    Flammability and Explosibility

    Not classified

    Synthesis of UV Absorber 326 from 6-tert-Butyl-4-methyl-2-[(4-chloro-2-nitrophenyl)azo]phenol

    UV Absorber 326 Preparation Products And Raw materials

    Raw materials

    Preparation Products

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    View Lastest Price from UV Absorber 326 manufacturers

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    Ultraviolet absorber UV-326 pictures 2023-11-28 Ultraviolet absorber UV-326
    US $2.00 / kg 1kg 99% 200mt Jinan Finer Chemical Co., Ltd
    US $0.00 / KG 1KG 98.0% 20 tons Qingdao Truelight functional Material Technology Co., Ltd.
    UV Absorber 326 pictures 2023-09-06 UV Absorber 326
    US $0.00-0.00 / KG 1KG 99% 500000kg Hebei Guanlang Biotechnology Co., Ltd.
    • UV Absorber 326 pictures
    • UV Absorber 326
    • US $0.00-0.00 / KG
    • 99%
    • Hebei Guanlang Biotechnology Co., Ltd.
    2-T-BUTYL-6-(5-CHLORO-2 H-BENZOTRIAZOL-2-YL)-4-METHYLPHENOL LABOTEST-BB LT00138024 2-(5-chloro-2h-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl-pheno Phenol, 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl- ACETOSTAB 326 2-(5-CHLORO-2-BENZOTRIAZOLYL)-6-TERT-BUTYL-PARA-CRESOL 2-(5-Chlor-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl-phenol Tinuvin 326 Ciba 2-(5-Chloro-2H-benzotriazole-2-yl)-4-methyl-6-(tert-butyl)phenol 5-Chloro-2-[3-(tert-butyl)-2-hydroxy-5-methylphenyl]-2H-benzotriazole 2(2’-Hydroxy-3’-t-butyl-5’-methylphenyl-5-chlorobenzotriazol 2-tert-butyl-6-(5-chlorobenzotriazol-2-yl)-4-methylphenol 2-tert-butyl-6-(5-chlorobenzotriazol-2-yl)-4-methyl-phenol 2-tert-Butyl-6-(5-chloro-2H-benzotriazol-2-yl)-p-cresol 5-Chloro-2-(3-tert-butyl-2-hydroxy-5-Methylp 2-tert-Butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-Methylphenol 98% 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol HRsorb-326 UV ABSORBER 326 2-tert-butyl-6-(5-chloro-2h-benzotriazol-2-yl)-4- 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole 6-tert-butyl-2-(5-chlorobenzotriazol-2-yl)-p-cresol 2-(5-Chloro-2h-Benzotriazole-2-Yl)-6-(1,1-Dimethylethyl)-4-Methyl-Phenol 2-(Hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole UV ABSORBER UV-326 2-(2'-HYDROXY-3'-TERT-BUTYL-5'-METHYLPHENYL)-5-CHLOROBENZOTRIAZOLE 2-(2-HYDROXY-3-TERT-BUTYL-5-METHYLPHENYL)-5-CHLOROBENZOTRIAZOLE 2-(2'-HYDROXY-3'-TERT-BUTYL-5'-METHYLPHENYL)-5-CHLOROBENZOTRIAZOLES 2-(3-tert-Butyl-2-hydroxy-5-methylphenyl)-5-chloro-2H-benzotriazole 2-(5-TERT-BUTYL-6-HYDROXY-M-TOLYL)-5-CHLOROBENZOTRIAZOLE 2-(5-CHLORO-2-BENZOTRIAZOLYL)-6-TERT-BUTYL-P-CRESOL 2-(5-chloro-2h-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methylphenol RIASORB UV-326 Light Stabilizer UV326 UV absorber Sunsorb 326 UVAbsorbChemicalbooker326 UV ABSORBER TRUELICHT UV 326 UV Absorber 326 ISO 9001:2015 REACH Octabenzone UV-326 SONGNOX CS 326WB 2-tert-Butyl-6(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol @1000 μg/mL in Acetonitrile 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol> Absorber UV-326 2-tert-butyl-6-(5-chloro-2H-1,2,3-benzotriazol-2-yl)-4-methylphenol UV73 2-tert-butyl-6-(5-chloro-2-benzotriazolyl)-4-methylphenol Bumetrizole UV-326 3896-11-5 Ultraviolet absorber UV-326 Bumetrizole 2-(5-Chloro-2H-benzotriazol-2-yl)-6-tert-butyl-p-cresol (OH=1) 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-4-cresol, 99% Bumetrizole(UV-326) 2-(5-chloro-2h-benzotriazol-2-yl)-6 2-(2'-Hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzortriazole BUMETRIZOLE TINUVIN 326 ULTRA-VIOLET ABSORBER UV-326 ULTRAVIOLET ABSORBENT UV-326 Sumisorb 300 2-(tert-Butyl)-6-(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)-4-Methylphenol
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