Plastic Additives UV Absorber 928/UV-928 CAS No 73936-91-1
Product Description
Chemical Name: 2 – (2-2H-benzo-triazole) -6 – (1 – methyl -1 -phenyl)-ethyl-4-(1,1,3,3-
tetramethylbutyl butyl) phenol
Synonyms:2-[2′-Hydroxy-3′-(a,a-dimethylbenzyl)-5′-(1,1,3,3-tetramethylbutyl)phenyl]benzotriazole;2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethy)-4-(1,1,3,3-tetramethylbutyl)-Phenol;TINUVIN928;2-[2-HYDROXY-3-DIMETHYLBENZYLPHENYL-5-(1,1,3,3-TETRAMETHYLBUTYL)]-2H-BENZOTRIAZOLE;2-6(2H-Benzotriazol-2-yl)-6-(1,1,3,3-tetramethylbutyl)Phenol;2-(2H-BENZOTRIAChemicalbookZOL-2-YL)-6-(1-METHYL-1-PHENYLETHYL)-4-(1,1,3,3-TETRAMETHYLBUTYL)PHENOL;UVABSORBER-928;Phenol,2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)-;2-[2-Hydroxy-3-dimethylbenzylphenyl-5-(1,1,3,3-tetramethylbutyl)]-2H-benzotriazol
Molecular Formula C29H35N3O
Molecular Weight 442
Structure
tetramethylbutyl butyl) phenol
Synonyms:2-[2′-Hydroxy-3′-(a,a-dimethylbenzyl)-5′-(1,1,3,3-tetramethylbutyl)phenyl]benzotriazole;2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethy)-4-(1,1,3,3-tetramethylbutyl)-Phenol;TINUVIN928;2-[2-HYDROXY-3-DIMETHYLBENZYLPHENYL-5-(1,1,3,3-TETRAMETHYLBUTYL)]-2H-BENZOTRIAZOLE;2-6(2H-Benzotriazol-2-yl)-6-(1,1,3,3-tetramethylbutyl)Phenol;2-(2H-BENZOTRIAChemicalbookZOL-2-YL)-6-(1-METHYL-1-PHENYLETHYL)-4-(1,1,3,3-TETRAMETHYLBUTYL)PHENOL;UVABSORBER-928;Phenol,2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)-;2-[2-Hydroxy-3-dimethylbenzylphenyl-5-(1,1,3,3-tetramethylbutyl)]-2H-benzotriazol
Molecular Formula C29H35N3O
Molecular Weight 442
Structure
CAS Number 73936-91-1
product description
Core Advantages & Characteristics of UV-928
UV-928 is a high-performance benzotriazole UV absorber, optimized for high-temperature processing and long-term outdoor weathering applications. Its core advantages and characteristics are listed below:
Superior Thermal Stability
Features exceptional heat resistance with an initial decomposition temperature of >300°C, 5% weight loss temperature (TGA) of 330°C and 10% weight loss temperature of 350°C. It remains chemically stable during high-temperature processing (up to 280°C) of polymers and coatings, without volatilization, degradation or discoloration. The melting point ranges from 108°C to 113°C, enabling uniform dispersion in substrate matrices.
Broad-spectrum & High-efficiency UV Absorption
Delivers strong absorption across both UV-B (280–320 nm) and UV-A (320–400 nm) regions with high molar extinction coefficient. It effectively blocks harmful UV radiation, preventing photodegradation, yellowing and loss of mechanical properties in materials, thus ensuring long-term outdoor durability.
Low Migration & Low Volatility
The unique molecular structure with bulky alkyl and aryl groups minimizes migration and volatility. It does not bloom on the surface of finished products, maintaining consistent UV protection performance and aesthetic appearance throughout the service life.
Excellent Compatibility & Processability
Shows good compatibility with a wide range of engineering polymers (e.g., PC, PA, PBT, PET, PMMA), powder coatings, coil coatings and solvent-based coatings. It adapts to various processing techniques including extrusion, injection molding and curing, with no adverse impact on substrate processability.
Low Color Impact & High Transparency
Appears as an off-white crystalline powder with negligible absorption in the visible light spectrum. It does not affect the clarity and color of transparent or light-colored formulations, making it ideal for optical films, clear coatings and light-hued plastic products.
Strong Synergistic Effect with HALS
When combined with hindered amine light stabilizers (HALS), it forms a synergistic system that significantly enhances the long-term weathering resistance of materials. This combination is particularly effective for outdoor applications such as automotive exterior parts, architectural coatings and agricultural films.
Superior Thermal Stability
Features exceptional heat resistance with an initial decomposition temperature of >300°C, 5% weight loss temperature (TGA) of 330°C and 10% weight loss temperature of 350°C. It remains chemically stable during high-temperature processing (up to 280°C) of polymers and coatings, without volatilization, degradation or discoloration. The melting point ranges from 108°C to 113°C, enabling uniform dispersion in substrate matrices.
Broad-spectrum & High-efficiency UV Absorption
Delivers strong absorption across both UV-B (280–320 nm) and UV-A (320–400 nm) regions with high molar extinction coefficient. It effectively blocks harmful UV radiation, preventing photodegradation, yellowing and loss of mechanical properties in materials, thus ensuring long-term outdoor durability.
Low Migration & Low Volatility
The unique molecular structure with bulky alkyl and aryl groups minimizes migration and volatility. It does not bloom on the surface of finished products, maintaining consistent UV protection performance and aesthetic appearance throughout the service life.
Excellent Compatibility & Processability
Shows good compatibility with a wide range of engineering polymers (e.g., PC, PA, PBT, PET, PMMA), powder coatings, coil coatings and solvent-based coatings. It adapts to various processing techniques including extrusion, injection molding and curing, with no adverse impact on substrate processability.
Low Color Impact & High Transparency
Appears as an off-white crystalline powder with negligible absorption in the visible light spectrum. It does not affect the clarity and color of transparent or light-colored formulations, making it ideal for optical films, clear coatings and light-hued plastic products.
Strong Synergistic Effect with HALS
When combined with hindered amine light stabilizers (HALS), it forms a synergistic system that significantly enhances the long-term weathering resistance of materials. This combination is particularly effective for outdoor applications such as automotive exterior parts, architectural coatings and agricultural films.
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Product name:
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UV absorber-928
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CAS NO:
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73936-91-1
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Appearance:
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White powder
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Melting point:
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112ºC
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Boiling point:
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555.5±60.0ºC
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Density:
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1.07
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Storage:
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Keep in dark place, Sealed in dry. Room temperature
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Specification
| Appearance | Pale yellow powder |
| Content | ≥99% |
| Melting point | ≥113ºC |
| Loss on dry | ≤0.5% |
| Ash | ≤0.01% |
| Light transmittance | 460nm≥97%; |
| 500nm≥98% |
Applications:
Good Solubility and good compatibility; high temperature and ambient temperature, especially suitable for systems that require high temperature curing powder coating sand coil coatings, automotive coatings.
Package and Storage
- 25kg carton
- Stored in sealed, dry and dark conditions
Packing
· 1kg/aluminium foil bag, with two plastic bags inside.
· 25kg/fiber drum, with two plastic bags inside.
Size:ID 42cm*H52cm,0.08m3/drum;
Net Weight:25kgs Gross Weight:28kgs.
Delivery
- ≤50kg, Express delivery recommended, usually called as DDU service;
- ≤500kg,Air shipping recommended, usually called as CIF service;
- >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;
- For high value products, please select air shipping and express delivery for safety.
The packaging can be customized to meet the specific needs of customers
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Shipping Choices
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By EMS / DHL / TNT / UPS
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By Fedex
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By Air
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By Sea
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Suitable Quantity
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Under 5kg
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Under 50kg
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Under 100kg
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More than 100kg
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Shipping Time
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7-15 Days
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3-10 Days
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5-15 Days
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10-45 Days
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Shipping Cost
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High
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A bit high
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Low
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Lowest
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Service
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Door to door
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Door to door
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To Airport
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To Port
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| ACF Chemical Co., Ltd. Athena phone/whatsapp：008613805212761 email：ceo@acfchemical.com No. 45 Pengwan Road, Qianwan Bonded Port Area, Qingdao Area, China (Shandong) welcome to vist our factory. |
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| Products name | CAS NO. |
| LS 944 | 70624-18-9 |
| LS 622 | 70198-29-7 |
| LS 770 | 52829-07-9 |
| LS 119 | 106993-43-6 |
| LS 2020 | 192268-64-7 |
| LS 292 | 41556-26-7+82919-37-7 |
| LS 123 | 129757-67-1 |
| LS 114 | 42774-15-2 |
| LS 3853 | 167078-06-0 |
| LS 610 | 106990-43-6+70198-29-7 |
| LS 611 | 106990-43-6+65447-77-0 |
| LS 783 | 70624-18-9+70198-29-7 |
| LS 791 | 70624-18-9+52829-07-9 |
| UV 531 | 1843-05-6 |
| UV P | 2440-22-4 |
| UV 1 | 57834-33-0 |
| UV 2 | 65816-20-8 |
| UV 99-2 | 127519-17-9 |
| UV 120 | 4221-80-1 |
| UV 234 | 70321-86-7 |
| UV 326 | 729335 |
| UV 327 | 3864-99-1 |
| UV 328 | 25973-55-1 |
| UV 329 | 3147-75-9 |
| UV 360 | 103597-45-1 |
| UV 400 | 153519-44-9 |
| UV 928 | 73936-91-1 |
| UV 1130 | 104810-48-2;104810-47-1;25322-68-3 |
| UV 1164 | 2725-22-6 |
