Clear plastics
Low color for PC, PMMA and PET.
UV-329 Benzotriazole UV Absorber Supplier
SUNSORB® 329 (UV-329) is a benzotriazole UV absorber widely used in polycarbonate, polyester, PVC and acrylics. It combines strong UV absorption with low color in clear and light-colored parts.
CAS 3147-75-9 · Benzotriazole · UV absorber
Présentation du produit
UV-329 (2-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tétraméthylbutyle)phénol) is a common choice for PC sheet, ANIMAUX, PVC, PMMA and styrenics. It is also a frequent replacement for restricted benzotriazoles such as 327 et 328.
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
Broad compatibility
PC, polyester, PVC, styrenics and acrylics.
Replacement option
Common alternative to restricted 327 et 328.
Spécifications techniques
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 |
|---|---|
| Nom du produit | UV Absorber UV-329 |
| Marque | SUNSORB® 329 |
| Numéro CAS. | 3147-75-9 |
| Nom chimique | 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tétraméthylbutyle)phénol |
| Formule moléculaire | C20H25N3O |
| Masse moléculaire | 323.4 |
| Apparence | White to light-yellow powder |
| Point de fusion | 103–105 °C |
| Essai | ≥99% |
| Volatile Matter | ≤0,5% |
| Cendre | ≤0,1% |
Applications by Material
Pick an application to see how 329 is normally used and what to confirm before your trial.
Polycarbonate & Acrylics
UV protection for PC sheet and acrylic parts, typically 0.1–0.5%.
What to confirm for your application
- Sheet or part thickness
- Clarity requirement
- Outdoor exposure
ANIMAUX & Polyester
Protects polyester bottles, film and fiber.
What to confirm for your application
- Polymer and process
- Température de traitement
- Color requirement
PVC & Styrenics
UV absorber for PVC and styrenic compounds.
What to confirm for your application
- Compound type
- Exposure
- Existing stabilizers
Emballage & Storage
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.
Technique & Buying Information
UV Absorber UV-329 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, 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.
Request a Quotation for UV Absorber UV-329
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 UV Absorbers & Stabilisateurs
UV Absorber UV-329 FAQ
329 ou 234 for polycarbonate?
Both are used. 234 has higher molecular weight and lower volatility for very high processing temperatures; 329 is a cost-effective standard.
Can 329 replace 328?
Often yes in plastics, depending on polymer and process. Re-run your weathering test after switching.
What dosage is typical?
0.1–0.5% depending on thickness and exposure.
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.
Discuss Your UV Absorber UV-329 Requirements
Send your application, specification and quantity to request a quotation or supporting documents.