What is drometrizole and what is it used for?
Drometrizole (CAS 2440-22-4, formula C13H11N3O) is a hydroxyphenyl-benzotriazole UV absorber used in coatings, adhesives, and thin plastic parts. It absorbs ultraviolet light strongly across the range that degrades polymers and converts it to harmless heat, protecting the binder, the pigment, and the substrate. RawSource supplies drometrizole in bulk against your grade and volume.
- ▸ UV screening of the film and substrate (Coatings, inks)
- ▸ Protects the bond line from ultraviolet embrittlement (Adhesives, sealants)
- ▸ UV protection at moderate process temperature (Films, fibers, thin sections)
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 →Drometrizole (CAS 2440-22-4, formula C13H11N3O) is a hydroxyphenyl-benzotriazole UV absorber used in coatings, adhesives, and thin plastic parts. It absorbs ultraviolet light strongly across the range that degrades polymers and converts it to harmless heat, protecting the binder, the pigment, and the substrate. RawSource supplies drometrizole in bulk against your grade and volume.
Drometrizole is the lowest-molecular-weight member of the benzotriazole absorber family, which makes it soluble and easy to disperse but more volatile than heavier grades. It suits coatings and thin sections where processing temperatures are moderate; for high-heat plastics, a heavier benzotriazole holds up better.
Applications
Coatings and inks
In solvent- and water-borne coatings and in inks, drometrizole dissolves readily and absorbs ultraviolet light in the film, protecting the resin and any color below it. It is a long-established choice for clear and pigmented coatings.
Adhesives and sealants
In adhesives and sealants exposed to daylight, drometrizole screens ultraviolet light that would otherwise embrittle the bond line. It is compounded into the formulation at low loading.
Thin plastic parts
In films, fibers, and thin molded sections processed at moderate temperature, drometrizole provides ultraviolet protection where its solubility is an advantage and its volatility is not a limitation.
Host polymers and typical use
Drometrizole 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 drometrizole 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
Drometrizole is an industrial UV absorber for coatings, adhesives, and plastics. It can be classified as toxic to aquatic life and as a skin sensitizer, and as a low-molecular-weight benzotriazole it sits in the sub-class under group review by several regulators, so keep it out of drains and waterways and follow the Safety Data Sheet for the exact classification and handling.
Bulk Drometrizole Supply from RawSource
RawSource supplies drometrizole 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 drometrizole 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 drometrizole quote
To buy drometrizole 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 is drometrizole used for?
Drometrizole is a benzotriazole UV absorber for coatings, inks, adhesives, sealants, and thin plastic parts. Its low molecular weight makes it dissolve and disperse easily, so it is favored in film-forming systems. It is often combined with a hindered-amine light stabilizer for longer outdoor durability.
How does drometrizole differ from heavier benzotriazole absorbers?
Drometrizole is the lightest benzotriazole absorber, which aids solubility but makes it more volatile at high processing temperatures. For high-heat plastics or thick parts, heavier grades, including the dimeric bisoctrizole, resist loss during processing better. Drometrizole is chosen where its solubility helps and heat is moderate.
Where can I buy bulk drometrizole?
RawSource supplies bulk drometrizole to coatings, plastics, and polymer-compounding buyers in bag, drum, and larger quantities sized to your run. Because several qualified producers make drometrizole 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. 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.