Broad UV coverage
Strong absorption into the UV-A range.
SUNSORB® 326
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
- Lot de COA avec chaque expédition
- Des échantillons pour vos essais
- Support technique pour votre essai
Présentation du produit & avantages clés
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, abdos, adhesives and coatings. The chlorine substitution shifts absorption toward longer wavelengths for better UV-A coverage.
Polyolefin standard
Widely used in PP and PE outdoor parts and film.
Low volatility
Better retention in processing than low-MW absorbers.
Spécifications techniques
| Parameter | Typical value |
|---|---|
| Nom du produit | UV Absorber UV-326 |
| Marque | SUNSORB® 326 |
| Numéro CAS. | 3896-11-5 |
| Nom chimique | 2-(5-Chloro-2H-benzotriazol-2-yl)-6-tert-butyl-4-methylphenol |
| Formule moléculaire | C17H18ClN3O |
| Masse moléculaire | 315.8 |
| Apparence | Light-yellow crystalline powder |
| Point de fusion | 138–141 °C |
| Essai | ≥99% |
| Volatile Matter | ≤0,5% |
| Cendre | ≤0,1% |
Typical specification. Every shipment is supplied with a batch COA; the limits that apply to your order are confirmed in the quotation and contract.
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.
Check before trial
- Part thickness or film gauge
- Pigment system
- Target weathering life
PVC, abdos & Styrenics
UV protection in PVC and styrenic compounds.
Check before trial
- Compound type
- Exposure
- Existing stabilizers
Adhésifs & Revêtements
UV absorber for adhesives, sealants and coatings.
Check before trial
- System type
- Exposure
- Color requirement
Selection & comparaison
Selecting a UV Absorber
| Your requirement | What usually works |
|---|---|
| Clear or light-colored polyolefin parts and film | Benzophenone (531) or benzotriazole (326) at low loading |
| High processing temperature (PC, ANIMAUX, Pennsylvanie) | Low-volatility grades: 234, 360 or 1577-type triazines |
| Thin films and fibers | Higher-MW, low-volatility grades so the absorber is not lost in processing |
| Solvent-borne and waterborne coatings | Liquid benzotriazoles (384-2, 1130) or triazine (400), paired with a HALS |
| Outdoor service longer than one season | UV absorber plus a HALS; the absorber filters, the HALS stops radical chains |
| Exports to the EU | Check REACH status first; some benzotriazoles (327, 328) are restricted |
| Replacing an existing grade | Send your current TDS or COA; we match on chemistry and the parameters you approve |
UV Absorber Comparison
Swipe or scroll horizontally to see all columns →
| Produit | Chemistry | Mol. weight | Point de fusion / form | Best fit | Typical starting level* |
|---|---|---|---|---|---|
| SUNSORB® 326 | Benzotriazole (CL) | 315.8 | 138–141 °C | PP, PE, PVC, adhésifs | 0.1–0,5% |
| SUNSORB® 531 | Benzophenone | 326.4 | 47–49 °C | PE, PP, PVC | 0.1–0,5% |
| SUNSORB® 329 | Benzotriazole | 323.4 | 103–105 °C | PC, ANIMAUX, PVC, PMMA | 0.1–0,5% |
| SUNSORB® 234 | Benzotriazole | 447.6 | 137–141 °C | PC, ANIMAUX, PA at high temperature | 0.1–0,5% |
| LUMIÈRE DU SOLEIL® 944 | Polymeric HALS | Mn 2000–3100 | Granule or powder | PP/PE film, tape, fibre | 0.1–0.6% |
*Starting points for trials, not fixed recommendations. Loading depends on part thickness, pigment, target service life and the HALS used alongside. UV absorbers and HALS work by different mechanisms and are usually combined.
Emballage & stockage
Emballage
25 kg net bags or cartons with a PE inner liner. Palletized; private-label packing on request.
Storage
Keep sealed in a cool, sec, ventilated place away from heat and direct sun. See the SDS for full handling details.
Délai de mise en œuvre & terms
Typically 3–15 business days from order confirmation, depending on quantity. GOUSSET, CIF or DAP to major ports.
Du premier e-mail à la fourniture approuvée
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, heures, 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.
Dites-nous votre besoin. Nous correspondons à la note.
Start with your material, part thickness, quantité et destination. Add your current UV package and we will quote against it.
| Information | Example |
|---|---|
| Polymer / Material | PP, PE, abdos, composé, mélange maître |
| Application | Injection molding, extrusion, film, fibre |
| Current additive | Grade or supplier you use today |
| Required specification | Your TDS, COA or key limits |
| Quantity | Trial order / monthly / annual volume |
| Emballage | Standard 25 kg or specific requirement |
| Destination | Country and port |
| Documents needed | COA, FDS, ATTEINDRE, food-contact statement |
Related products
SUNSORB® 531
Benzophenone UV absorber for polyolefins and PVC, cost-effective and widely used.
View product →LUMIÈRE DU SOLEIL® 944
Polymeric HALS for PP and PE film, tape and fiber with low volatility.
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 ou 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?
Oui. 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.
