What is UV-234 and what is it used for?
UV-234 (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 UV-234 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 →UV-234 (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 UV-234 in bulk against your grade and volume.
RawSource supplies UV-234 as a technical benzotriazole UV absorber comparable to Tinuvin 234 (BASF). RawSource is an independent distributor and is not affiliated with, endorsed by, or sponsored by the brand owners; the brand names are used only to identify the comparable commercial grade.
The two cumyl groups on UV-234 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 UV-234 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, UV-234 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, UV-234 holds color and surface quality under outdoor exposure, with the thermal stability the material demands.
Coatings for demanding service
In high-durability coatings, UV-234 provides long-lasting ultraviolet protection where low volatility and permanence in the film matter.
Host polymers and typical use
UV-234 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 UV-234 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
UV-234 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 UV-234 Supply from RawSource
RawSource supplies UV-234 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 UV-234 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 UV-234 quote
To buy UV-234 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 UV-234 over a lighter benzotriazole?
UV-234 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 UV-234 for high-heat processing and long service; choose a lighter grade like UV-P where heat is moderate.
What polymers is UV-234 used in?
UV-234 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.
Is UV-234 the same as Tinuvin 234?
UV-234 is the generic industry designation for this UV absorber; Tinuvin 234 is a branded grade of BASF. They identify the same class of chemistry, and RawSource supplies UV-234 as a technical grade comparable to Tinuvin 234. RawSource is an independent distributor and is not affiliated with or endorsed by the brand owner. Confirm the exact grade and specification against the Certificate of Analysis.
Where can I buy bulk UV-234?
RawSource supplies bulk UV-234 to coatings, plastics, and polymer-compounding buyers in bag, drum, and larger quantities sized to your run. Because several qualified producers make UV-234 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 UV-328, which 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 (UV-320, UV-326, UV-327, UV-329, and UV-350). 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.