What is this benzotriazole UV absorber and what is it used for?
2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (CAS 70321-86-7, formula C30H29N3O) is a high-molecular-weight hydroxyphenyl-benzotriazole UV absorber for engineering plastics and other polymers processed at high temperature. Its size makes it resist loss during hot processing and stay in the part in service, absorbing ultraviolet light that would otherwise embrittle and yellow the resin. RawSource supplies this absorber in bulk against your grade and volume.
- ▸ UV protection at high process temperature (Polycarbonate, PC/ABS blends)
- ▸ Color and surface retention outdoors (ABS, high-heat styrenics)
- ▸ Permanent, low-volatility UV screening (High-durability coatings)
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (CAS 70321-86-7, formula C30H29N3O) is a high-molecular-weight hydroxyphenyl-benzotriazole UV absorber for engineering plastics and other polymers processed at high temperature. Its size makes it resist loss during hot processing and stay in the part in service, absorbing ultraviolet light that would otherwise embrittle and yellow the resin. RawSource supplies this absorber in bulk against your grade and volume.
The two cumyl groups on this benzotriazole raise its molecular weight and cut its volatility, so it survives the melt temperatures of polycarbonate, ABS, and their blends without evaporating or blooming. That durability is why it is specified for demanding, high-heat engineering applications rather than simple film.
Applications
Polycarbonate and PC blends
In polycarbonate and PC/ABS blends processed at high temperature, the absorber screens ultraviolet light while resisting loss during molding. It protects clarity and impact strength in glazing, housings, and automotive parts.
ABS and high-heat styrenics
In ABS and other high-heat styrenics, the absorber holds color and surface quality under outdoor exposure, with the thermal stability the material demands.
Coatings for demanding service
In high-durability coatings, the absorber provides long-lasting ultraviolet protection where low volatility and permanence in the film matter.
Host polymers and typical use
The absorber is dispersed into the polymer or coating during compounding or formulation, where it absorbs ultraviolet light before it can break polymer chains, fade pigments, or dull the surface. The systems below are where it is most often specified.
Typical use levels for polymer UV absorbers fall in the 0.1 to 1.0 percent range, set by part thickness, expected outdoor exposure, and the co-stabilizer package (commonly a hindered-amine light stabilizer). Confirm loading on the bench and the exact specification on the Certificate of Analysis for each lot.
Handling and regulatory status
This compound is an industrial UV absorber for engineering plastics and coatings. It is a high-molecular-weight benzotriazole that is not on the EU REACH Candidate List; review the Safety Data Sheet for aquatic-hazard classification, and keep it out of drains and waterways.
Bulk Benzotriazole UV Absorber Supply from RawSource
RawSource supplies this benzotriazole UV absorber in bulk to coatings, plastics, and polymer compounding buyers and their purchasing teams. We source to your target grade, purity, and physical form across domestic and import channels, so we match specification, lead time, and landed cost to your program. Multiple qualified producers make this absorber to a common identity, which keeps supply competitive and available on demand.
Every lot ships with a Certificate of Analysis (CoA) and the current Safety Data Sheet (SDS). We source to order rather than carry fixed stock, so pricing and availability are confirmed by quote. Send your grade, annual volume, and any specification limits for a current bulk price.
Request a bulk quote
To buy this benzotriazole UV absorber in bulk from RawSource, send your target grade, physical form, packaging, destination, and any specification requirement, and we return a current bulk quote. A CoA and SDS accompany every shipment. Request a quote to get started.
Frequently Asked Questions
Why choose this benzotriazole over a lighter one?
This absorber has a high molecular weight and low volatility, so it stays in the polymer through the high melt temperatures of engineering plastics such as polycarbonate and PC/ABS, where lighter absorbers can evaporate or bloom. Choose it for high-heat processing and long service; choose a lighter benzotriazole where heat is moderate.
What polymers is this absorber used in?
It is used in polycarbonate, PC/ABS blends, ABS, high-heat styrenics, and high-durability coatings. Its size makes it well suited to resins processed at high temperature, and it is commonly paired with a hindered-amine light stabilizer for full outdoor performance.
Where can I buy this absorber in bulk?
RawSource supplies this absorber in bulk to coatings, plastics, and polymer-compounding buyers in bag, drum, and larger quantities sized to your run. Because several qualified producers make it to a common identity, supply is competitive and available on demand. Send your grade, volume, and destination for a current bulk quote; a CoA and SDS ship with every lot.
Is this UV absorber a restricted substance?
No. This grade is not the benzotriazole that was listed under the Stockholm Convention on Persistent Organic Pollutants in 2023, and it is not one of the benzotriazoles on the EU REACH Candidate List of Substances of Very High Concern. It is an industrial additive for polymers and coatings and is not sold for food, drug, or cosmetic use unless a grade is specified for it. Always follow the Safety Data Sheet for handling and disposal.