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ChemicalBook >> CAS DataBase List >>UV Absorber 326

UV Absorber 326

Chemical Name:
UV Absorber 326
UV-326;BUMETRIZOLE;tinuvin;TINUVIN 326;Sumisorb 300;ULTRAVIOLET ABSORBENT UV-326;ULTRA-VIOLET ABSORBER 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
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
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.


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.


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

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

Global( 393)Suppliers
Supplier Tel Email Country ProdList Advantage
+86 13658692156 zandrew@jadenmtc.com China 234 58
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+86-0371-55170693 +86-19937530512 info@tianfuchem.com China 21719 55
Shanghai Time Chemicals CO., Ltd.
+86-021-57951555 +8617317452075 jack.li@time-chemicals.com China 1807 55
Hefei TNJ Chemical Industry Co.,Ltd.
+86-0551-65418679 +86-18949832763 info@tnjchem.com China 2990 55
Tianjin Zhongxin Chemtech Co., Ltd.
+86-022-66880623 +8618622897568 sales@tjzxchem.com China 555 58
career henan chemical co
+86-0371-86658258 sales@coreychem.com China 29920 58
Tianjin Huiren Chemtech Co., Ltd
+8613672008665 huirentech@foxmail.com China 110 58

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View Lastest Price from UV Absorber 326 manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Ultraviolet absorber UV-326 pictures 2023-12-07 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 BUMETRIZOLE LABOTEST-BB LT00138024 TINUVIN 326 ULTRA-VIOLET ABSORBER UV-326 ULTRAVIOLET ABSORBENT UV-326 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 Sumisorb 300 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-benzo[d][1,2,3]triazol-2-yl)-4-Methylphenol 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 2-(2'-Hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzortriazole 2-(5-chloro-2h-benzotriazol-2-yl)-6 Bumetrizole(UV-326) 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-4-cresol, 99% UV ABSORBER 326 2-tert-butyl-6-(5-chloro-2h-benzotriazol-2-yl)-4- tinuvin 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole 6-tert-butyl-2-(5-chlorobenzotriazol-2-yl)-p-cresol UV-326 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 2-TERT-BUTYL-6-(5-CHLORO-2 H-BENZOTRIAZOL-2-YL)-4-METHYLPHENOL 2-(5-Chloro-2H-benzotriazol-2-yl)-6-tert-butyl-p-cresol (OH=1) Ultraviolet absorber UV-326 Bumetrizole Bumetrizole UV-326 3896-11-5 2-tert-butyl-6-(5-chloro-2-benzotriazolyl)-4-methylphenol UV73 2-tert-butyl-6-(5-chloro-2H-1,2,3-benzotriazol-2-yl)-4-methylphenol Absorber UV-326 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol> 2-tert-Butyl-6(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol @1000 μg/mL in Acetonitrile SONGNOX CS 326WB Octabenzone UV-326 UV Absorber 326 ISO 9001:2015 REACH UV ABSORBER TRUELICHT UV 326
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