ChemicalBook >> CAS DataBase List >>UV Absorber 326

UV Absorber 326

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:2024-05-23 18:06:45

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 $78.5 2024-03-01 Buy
TCI Chemical H0559 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol >98.0%(GC) 3896-11-5 25g $68 2024-03-01 Buy
TCI Chemical H0559 2-(5-Chloro-2-benzotriazolyl)-6-tert-butyl-p-cresol >98.0%(GC) 3896-11-5 500g $211 2024-03-01 Buy
TRC B689680 Bumetrizole 3896-11-5 50g $70 2021-12-16 Buy
American Custom Chemicals Corporation EMT0000005 BUMETRIZOLE 95.00% 3896-11-5 10G $121.8 2021-12-16 Buy
Product number Packaging Price Buy
422479 50g $78.5 Buy
H0559 25g $68 Buy
H0559 500g $211 Buy
B689680 50g $70 Buy
EMT0000005 10G $121.8 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

Global( 406)Suppliers
Supplier Tel Email Country ProdList Advantage
+86 13658692156 China 221 58
Hu Bei Jiutian Bio-medical Technology CO.,Ltd
027-88013699 17354350817 China 7433 58
Hebei Zhuanglai Chemical Trading Co.,Ltd
+8613343047651 China 2196 58
Capot Chemical Co.,Ltd.
571-85586718 +8613336195806 China 29797 60
Shanghai Daken Advanced Materials Co.,Ltd
+86-371-66670886 China 15956 58
Henan Tianfu Chemical Co.,Ltd.
+86-0371-55170693 +86-19937530512 China 21689 55
Shanghai Time Chemicals CO., Ltd.
+86-021-57951555 +8617317452075 China 1807 55
Hefei TNJ Chemical Industry Co.,Ltd.
+86-0551-65418679 +86-18949832763 China 2989 55
Tianjin Zhongxin Chemtech Co., Ltd.
+86-022-66880623 +8618622897568 China 559 58
career henan chemical co
+86-0371-86658258 China 29914 58

Related articles

View Lastest Price from UV Absorber 326 manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Ultraviolet absorber UV-326 pictures 2024-05-24 Ultraviolet absorber UV-326
US $2.00 / kg 1kg 99% 200mt Jinan Finer Chemical Co., Ltd
UV Absorber 326 pictures 2024-05-23 UV Absorber 326
US $180.00 / kg 1kg 99% 20ton Hebei Zhuanglai Chemical Trading Co.,Ltd
US $0.00 / KG 1KG 98.0% 20 tons Qingdao Truelight functional Material Technology Co., Ltd.
  • UV Absorber 326 pictures
  • UV Absorber 326
  • US $180.00 / kg
  • 99%
  • Hebei Zhuanglai Chemical Trading 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