Low volatility
Good retention in film and fiber processing.
SUNSORB® 327
UV-327 Benzotriazole UV Absorber Supplier
SUNSORB® 327 (UV-327) is a low-volatility chlorinated benzotriazole UV absorber used in polyolefin film, fiber and other plastics. UV-327 is listed as a Substance of Very High Concern under EU REACH, so check your market before ordering.
CAS 3864-99-1 · Benzotriazole · UV absorber
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
UV-327 (2,4-di-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)phenol) has low volatility and good compatibility in polyolefins. Because of its REACH status, many EU buyers have moved to alternatives such as UV-326, 329 or 234. Outside the EU it remains in use; we confirm the rules for your destination before quoting.
Polyolefin compatibility
Used in PP and PE film and fiber.
Alternatives available
If 327 is restricted in your market we can propose and supply a replacement.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product Name | UV Absorber UV-327 |
| Brand | SUNSORB® 327 |
| CAS No. | 3864-99-1 |
| Chemical Name | 2,4-Di-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)phenol |
| Molecular Formula | C20H24ClN3O |
| Molecular Weight | 357.9 |
| Appearance | Light-yellow powder |
| Melting Point | 154–158 °C |
| Assay | ≥99% |
| Volatile Matter | ≤0.5% |
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 327 is normally used and what to confirm before your trial.
PP & PE Film and Fiber
Low-volatility UV absorber for thin sections.
Check before trial
- Destination market and REACH status
- Film or fiber gauge
- HALS used
Polyolefin Parts
UV protection in molded polyolefins.
Check before trial
- Destination market
- Part thickness
- Target weathering life
Replacing UV-327
For EU and other restricted markets, 326, 329 or 234 are common replacements depending on polymer and process.
Check before trial
- Current loading of 327
- Polymer and processing temperature
- Weathering test to re-qualify
Selection & comparison
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, PET, PA) | 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 →
| Product | Chemistry | Mol. weight | Melting point / form | Best fit | Typical starting level* |
|---|---|---|---|---|---|
| SUNSORB® 327 | Benzotriazole (Cl) | 357.9 | 154–158 °C | PP, PE film and fiber (check REACH) | 0.1–0.5% |
| SUNSORB® 326 | Benzotriazole (Cl) | 315.8 | 138–141 °C | PP, PE, PVC, adhesives | 0.1–0.5% |
| SUNSORB® 234 | Benzotriazole | 447.6 | 137–141 °C | PC, PET, PA at high temperature | 0.1–0.5% |
| SUNSORB® 329 | Benzotriazole | 323.4 | 103–105 °C | PC, PET, PVC, PMMA | 0.1–0.5% |
| SUNLIGHT® 944 | Polymeric HALS | Mn 2000–3100 | Granule or powder | PP/PE film, tape, fiber | 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.
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.
From first email to approved supply
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.
Tell us your requirement. We match the grade.
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 products
UV Absorber UV-327 FAQ
Can I use UV-327 in products sold in the EU?
UV-327 is a REACH SVHC and subject to authorisation, so EU use is heavily restricted. Tell us your market and we confirm the position and suggest an alternative if needed.
What can replace UV-327?
UV-326 is the closest in performance in polyolefins; 329 and 234 are alternatives depending on polymer and temperature. A weathering re-test is needed.
What dosage is typical?
0.1–0.5% with a HALS for outdoor use.
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.
