Broad UV coverage
Strong absorption into the UV-A range.
UV-326 Benzotriazole UV Absorber Supplier
SUNSORB® 326 (UV-326) is a chlorinated benzotriazole UV absorber with low volatility and good compatibility in polyolefins, PVC and adhesives. It is one of the most widely used UV absorbers for PP and PE.
CAS 3896-11-5 · Benzotriazole · UV absorber
Product Overview
UV-326 (2-(5-chloro-2H-benzotriazol-2-yl)-6-tert-butyl-4-methylphenol) absorbs strongly at 300–400 nm and is used in PP, PE, PVC, polyester, ABS, adhesives and coatings. The chlorine substitution shifts absorption toward longer wavelengths for better UV-A coverage.
Typical specification. Every shipment is supplied with a batch COA; the limits that apply to your order are confirmed in the quotation and contract.
Key Benefits
Polyolefin standard
Widely used in PP and PE outdoor parts and film.
Low volatility
Better retention in processing than low-MW absorbers.
Technical Specifications
Typical specification. Every shipment is supplied with a batch COA; the limits that apply to your order are confirmed in the quotation and contract.
| Parameter | Typical value |
|---|---|
| Product Name | UV Absorber UV-326 |
| Brand | SUNSORB® 326 |
| CAS No. | 3896-11-5 |
| Chemical Name | 2-(5-Chloro-2H-benzotriazol-2-yl)-6-tert-butyl-4-methylphenol |
| Molecular Formula | C17H18ClN3O |
| Molecular Weight | 315.8 |
| Appearance | Light-yellow crystalline powder |
| Melting Point | 138–141 °C |
| Assay | ≥99% |
| Volatile Matter | ≤0.5% |
| Ash | ≤0.1% |
Applications by Material
Pick an application to see how 326 is normally used and what to confirm before your trial.
PP & PE Parts and Film
Typically 0.1–0.5%, usually with a HALS for outdoor use.
What to confirm for your application
- Part thickness or film gauge
- Pigment system
- Target weathering life
PVC, ABS & Styrenics
UV protection in PVC and styrenic compounds.
What to confirm for your application
- Compound type
- Exposure
- Existing stabilizers
Adhesives & Coatings
UV absorber for adhesives, sealants and coatings.
What to confirm for your application
- System type
- Exposure
- Color requirement
Packaging & Storage
Packaging
25 kg net bags or cartons with a PE inner liner. Palletized; private-label packing on request.
Storage
Keep sealed in a cool, dry, ventilated place away from heat and direct sun. See the SDS for full handling details.
Lead time & terms
Typically 3–15 business days from order confirmation, depending on quantity. FOB, CIF or DAP to major ports.
Technical & Buying Information
UV Absorber UV-326 Buyer Guide
Define the exposure
Indoor light behind glass, outdoor temperate climate and desert or tropical exposure need very different packages. Note the target service life and the weathering test you use (xenon or QUV, hours, ΔE or gloss retention).
Match absorber to process and thickness
A UV absorber works by filtering, so it needs enough path length: thick parts need less, thin films and fibers need more and need a low-volatility grade. Check the absorber survives your processing temperature.
Combine with a HALS
For outdoor use the standard approach is UV absorber plus HALS. Send your current package and pigment system and we suggest a starting combination for the trial.
Check regulations before you buy
Some benzotriazoles are restricted in the EU and other markets. Tell us the destination and end use, and we confirm the REACH and food-contact position of the grade before you order.
Request a Quotation for UV Absorber UV-326
Start with your material, part thickness, quantity and destination. Add your current UV package and we will quote against it.
| Information | Example |
|---|---|
| Polymer / Material | PP, PE, ABS, compound, masterbatch |
| Application | Injection molding, extrusion, film, fiber |
| Current additive | Grade or supplier you use today |
| Required specification | Your TDS, COA or key limits |
| Quantity | Trial order / monthly / annual volume |
| Packaging | Standard 25 kg or specific requirement |
| Destination | Country and port |
| Documents needed | COA, SDS, REACH, food-contact statement |
Related UV Absorbers & Stabilizers
SUNSORB® 531
Benzophenone UV absorber for polyolefins and PVC, cost-effective and widely used.
View product →UV Absorber UV-326 FAQ
What is the regulatory status of UV-326?
Requirements differ by market and are changing. Tell us your destination and end use and we confirm the current status before you order.
What dosage is typical?
0.1–0.5% depending on thickness and exposure, with a HALS for outdoor parts.
326 or 531?
326 gives broader UV-A coverage and lower volatility; 531 is more economical. Both are common in polyolefins.
Can I get a sample before ordering?
Yes. Tell us the polymer, the test you plan to run and the quantity you need. Samples ship with a COA so you can compare the lot against your current material.
What if a COA does not match our agreed specification?
Send us the agreed specification and the COA showing the difference (parameter, unit and test method). We check it with the production batch record before you accept the material, and replace or re-test where the lot is out of specification.
Discuss Your UV Absorber UV-326 Requirements
Send your application, specification and quantity to request a quotation or supporting documents.