UV-328 (Benzotriazole UV Absorber)

Name: UV-328 (Benzotriazole UV Absorber)
Brand: RawSource

At a Glance

Material Family

Specialty Additives

Record Type

Pure compound

Primary Role

Corrosion Inhibition · UV Protection

Functional Roles

Corrosion Inhibition UV Protection

Industries Served

Coatings & Construction Industrial Manufacturing Oil & Gas Textiles Water Treatment

Applications & Use Cases

▸ Plastics stabilization: UV absorber for polyolefins, PVC, and polyacrylates.
▸ Coatings: Light stabilizer for clear and automotive coatings.
▸ Adhesives and sealants: UV protection in adhesive systems.
▸ Outdoor articles: Stabilizes outdoor furniture and films.

Physical Properties

Physical Description

Dry Powder, Pellets or Large Crystals; NKRA; Other Solid; Dry Powder

Appearance

White to yellow powder or crystals

Solubility

In water, log -1.37

Safety & Handling

Full SDS available on request

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.

HS / Tariff Classification

Harmonized System (HS) Code — 6-digit international heading

2933 . 99

Chapter 29

Organic chemicals

Heading 29.33

Internationally harmonized (WCO HS)

Subheading 2933.99

6-digit international code — national tariff line adds further digits

Chemical Identity

CAS Number

25973-55-1

Molecular Formula

C22H29N3O

Molecular Weight

351.5 g/mol

IUPAC Name

2-(benzotriazol-2-yl)-4,6-bis(2-methylbutan-2-yl)phenol

PubChem CID

33263

InChI Key

ZMWRRFHBXARRRT-UHFFFAOYSA-N

Synonyms & Trade Names

2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)- 2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol UV-328 Tinuvin 328 Phenol, 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentyl- CHISORB 328 CYASORB UV 2337 UV328 UV 328 2-(2H-Benzo[d][1,2,3]triazol-2-yl)-4,6-di-tert-pentylphenol 2-(3,5-Di-tert-amyl-2-hydroxyphenyl)benzotriazole C22H29N3O 2-(benzotriazol-2-yl)-4,6-bis(2-methylbutan-2-yl)phenol 2-(2'-Hydroxy-3',5'-di-tert-amylphenyl)benzotriazole 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole 2-(2-Hydroxy-3,5-di-tert-amylphenyl)-2H-benzotriazole 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)phenol 2-(2-hydroxy-3,5-di-tert-amylphenyl)benzotriazole

Full Description

UV-328 (CAS 25973-55-1) is a benzotriazole-class ultraviolet light absorber. It is incorporated into plastics, coatings, and adhesives to absorb UV radiation, with established use in polyolefins, polyurethanes, PVC, polyacrylates, and epoxies.

Frequently Asked Questions

What is benzotriazole UV absorber (UV-328) used for?

UV-328 (CAS 25973-55-1) is a benzotriazole-class ultraviolet light absorber incorporated into plastics, coatings, and adhesives to absorb UV radiation. It has established use in polyolefins, polyurethanes, PVC, polyacrylates, and epoxies, and stabilizes clear/automotive coatings and outdoor articles.

What is the difference between benzotriazole and benzophenone UV absorbers?

Both are UV-absorber classes, but benzotriazoles such as UV-328 generally provide broader UV-band absorption and higher photopermanence in demanding outdoor applications, while benzophenones are often lower cost for less demanding systems. Selection depends on the resin and durability target; specify your polymer on the RFQ.

How does a UV absorber differ from a HALS stabilizer?

A UV absorber like UV-328 works by absorbing incident UV radiation before it degrades the polymer, whereas a hindered amine light stabilizer (HALS) scavenges free radicals formed during degradation. They are frequently used together for additive synergy in coatings and outdoor plastics.

What CAS number and HS code apply to UV-328?

CAS 25973-55-1, molecular formula C22H29N3O. HS classification is 2933.99 (heterocyclic compounds with nitrogen hetero-atom(s) only: other). Request a lot-specific CoA and SDS for assay, identity, and GHS handling data.

What bulk packaging is available and how is benzotriazole UV absorber priced?

It is supplied in bulk to plastics, coatings, and adhesive manufacturers; pack sizes and pricing track grade and volume, so we quote per order. Send a bulk RFQ with your target volume and end-use polymer for a quote plus CoA and SDS.

Related Products

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.

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