Strong in styrenics
Standard antioxidant for HIPS and ABS, added during or after polymerization.
SUNNOX® 245
Antioxidant 245 Supplier for Styrenics and Engineering Plastics
SUNNOX® 245 is a hindered phenolic primary antioxidant favored in HIPS, ABS, POM, polyamide and polyurethane. It gives processing and long-term thermal protection with good color retention.
CAS 36443-68-2 · Hindered phenol · Primary antioxidant
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
Antioxidant 245 (triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]) combines good compatibility in polar polymers with low color formation. It is widely used in styrenic polymers during and after polymerization, in POM and PA compounds, and in PU systems.
Polar-polymer compatibility
Works well in POM, PA and PU where some phenolics bloom.
Good color
Low tendency to discolor during processing.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product Name | Antioxidant 245 |
| Brand | SUNNOX® 245 |
| CAS No. | 36443-68-2 |
| Chemical Name | Triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] |
| Molecular Formula | C34H50O8 |
| Molecular Weight | 586.8 |
| Appearance | White crystalline powder |
| Melting Point | 76–79 °C |
| Assay | ≥98% |
| Volatile Matter | ≤0.5% |
| Ash | ≤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 Polymer
Pick an application to see how 245 is normally used and what to confirm before your trial.
HIPS, ABS & Styrenics
Added during polymerization or compounding, typically 0.1–0.3%.
Check before trial
- Polymerization or compounding addition
- Processing temperature
- Color target
POM & Polyamide
Long-term thermal protection in POM and PA compounds.
Check before trial
- Polymer type and filler
- Heat-aging requirement
- Existing stabilizers
Polyurethane & PVC
Used in TPU, PU systems and PVC as a non-discoloring antioxidant.
Check before trial
- System type
- Processing temperature
- Color target
Selection & comparison
Selecting an Antioxidant System
| Your requirement | What usually works |
|---|---|
| Color and melt-flow stability during extrusion or molding | Phosphite secondary antioxidant (168) with a phenolic primary |
| Long-term heat aging in service | High-MW phenolic primary (1010), often with a thioester (DLTDP / DSTDP) |
| Thin film, fiber, low-melting compounding | Lower-melting phenolic (1076) for easy dispersion |
| Repeated processing / recycled content | Raise the phosphite share in the blend and check yellowing after each pass |
| Humid storage or long transit | Hydrolysis-resistant phosphite such as 168; keep bags sealed |
| Food-contact articles | Ask for the grade-specific food-contact statement before trials |
| Replacing an existing grade | Send your current TDS or COA; we match on the parameters you approve |
Antioxidant Comparison
Swipe or scroll horizontally to see all columns →
| Product | Type | Mol. weight | Melting point | Main job | Typical starting level* |
|---|---|---|---|---|---|
| SUNNOX® 245 | Hindered phenol · primary | 586.8 | 76–79 °C | Styrenics, POM, PA, PU | 0.1–0.3% |
| SUNNOX® 1010 | Hindered phenol · primary | 1177.6 | 110–125 °C | Long-term thermal protection | 0.05–0.3% |
| SUNNOX® 1098 | Hindered phenol · amide | 636.9 | 156–161 °C | Polyamide and fiber stabilization | 0.1–0.5% |
| SUNNOX® 168 | Phosphite · secondary | 646.9 | 183–187 °C | Processing stability, color | 0.05–0.2% with a phenolic |
| SUNNOX® 1076 | Hindered phenol · primary | 530.9 | 50–55 °C | Long-term protection, easy dispersion | 0.05–0.3% |
*Starting points for trials, not fixed recommendations. The right level depends on resin, catalyst residue, processing temperature and service life. Primary and secondary antioxidants do different jobs and are not interchangeable.
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
Name the failure you want to prevent
Yellowing or melt-flow change during processing points to the phosphite share; embrittlement or cracking after months in service points to the phenolic and thioester share. Note recycled content and the number of extrusion passes.
Start from a proven blend
Most polyolefin packages start from a phenolic primary plus a phosphite secondary, then adjust. Send your current package and we suggest a starting blend for the trial instead of changing several variables at once.
Compare the numbers that matter
For powders: assay, melting range, volatiles and light transmittance at 425/500 nm (a direct read on color). Ask for the same parameters on our COA that appear on your incoming-inspection sheet.
Lock in supply terms
Agree packaging, monthly volume, destination port and required documents up front. A matching CAS number alone does not qualify a new source; run your trial and keep the approved lot COA as the reference.
Tell us your requirement. We match the grade.
Start with your polymer, quantity and destination. Add your current grade or specification 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
SUNNOX® 1010
High-MW hindered phenolic primary antioxidant for long-term thermal protection with low volatility.
View product →SUNNOX® 1098
Amide-type phenolic antioxidant built for polyamides and fiber, with good color during processing.
View product →SUNNOX® 168
Hydrolysis-resistant phosphite secondary antioxidant for color and melt-flow protection during processing.
View product →SUNNOX® 1076
Low-melting hindered phenolic primary antioxidant, easy to disperse in film and compounding.
View product →Antioxidant 245 FAQ
Why choose 245 for ABS or HIPS?
It is compatible with styrenic polymers and keeps color well during processing, which is why it is a standard choice there.
What dosage is typical?
0.1–0.3% in most systems. Confirm in your trial.
Can 245 be combined with a phosphite?
Yes. Adding 168 or another phosphite improves processing color and melt stability.
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.
