What is bisoctrizole and what is it used for?
Bisoctrizole (CAS 103597-45-1, formula C41H50N6O2) is a dimeric hydroxyphenyl-benzotriazole UV absorber for polycarbonate, PET, and engineering plastics. Two benzotriazole units in one molecule give it strong ultraviolet absorption and very low volatility, so it resists loss during hot processing and stays in the part. RawSource supplies bisoctrizole in bulk against your grade and volume.
METHYLENE BIS-BENZOTRIAZOLYL TETRAMETHYLBUTYLPHENOL- ▸ Durable UV protection at high process temperature (Polycarbonate, engineering plastics)
- ▸ Clarity and strength retention outdoors (PET, polyester film and sheet)
- ▸ Strong, permanent 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 →Bisoctrizole (CAS 103597-45-1, formula C41H50N6O2) is a dimeric hydroxyphenyl-benzotriazole UV absorber for polycarbonate, PET, and engineering plastics. Two benzotriazole units in one molecule give it strong ultraviolet absorption and very low volatility, so it resists loss during hot processing and stays in the part. RawSource supplies bisoctrizole in bulk against your grade and volume.
Because bisoctrizole carries two absorbing units and a high molecular weight, it delivers a lot of ultraviolet protection per unit added and does not migrate or evaporate out of the part. That permanence makes it a premium choice for demanding, high-heat, long-life applications, and the same molecule is also used cosmetically.
Applications
Polycarbonate and engineering plastics
In polycarbonate, blends, and other engineering resins processed at high temperature, bisoctrizole provides durable ultraviolet protection while resisting loss during molding and in service. It protects clarity, color, and mechanical strength.
PET and polyester
In PET film, sheet, and molded parts, bisoctrizole screens ultraviolet light to hold clarity and strength, with the low volatility that hot polyester processing requires.
High-durability coatings
In coatings for long outdoor service, bisoctrizole gives strong, permanent ultraviolet screening where its low volatility keeps it in the film.
Host polymers and typical use
Bisoctrizole 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 bisoctrizole 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
Bisoctrizole is an industrial UV absorber for plastics and coatings, and the same molecule is separately permitted as a cosmetic UV filter in some regions. It is a high-molecular-weight benzotriazole with low bioavailability; follow the Safety Data Sheet for the exact classification and handling.
Bulk Bisoctrizole Supply from RawSource
RawSource supplies bisoctrizole 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 bisoctrizole 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 bisoctrizole quote
To buy bisoctrizole 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
What makes bisoctrizole a premium absorber?
Bisoctrizole is a dimer with two benzotriazole absorbing units and a high molecular weight, so it absorbs ultraviolet light strongly and barely migrates or evaporates from the part. That gives durable protection in high-heat engineering plastics such as polycarbonate and PET, which is why it commands a premium over single-unit benzotriazoles.
Where can I buy bulk bisoctrizole?
RawSource supplies bulk bisoctrizole to coatings, plastics, and polymer-compounding buyers in bag, drum, and larger quantities sized to your run. Because several qualified producers make bisoctrizole 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.