Liquid, easy to meter
Dissolves directly in polyols, plasticizers and oils without a dispersion step.
SUNNOX® 1135
Antioxidant 1135 Liquid Phenolic Antioxidant Supplier
SUNNOX® 1135 is a liquid hindered phenolic antioxidant. It is the standard choice for polyols and PU foam to prevent scorch, and is also used in PVC, adhesives, elastomers and lubricants.
CAS 125643-61-0 · Hindered phenol · Liquid
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
Antioxidant 1135 (C7–C9 branched alkyl ester of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid) dissolves directly in polyols, plasticizers and oils, so it is simple to meter. In flexible PU foam it protects against core discoloration (scorch) during the exothermic foaming step, usually together with an aminic or phosphite co-stabilizer.
Scorch protection
Protects flexible PU foam against core discoloration during foaming.
Low volatility for a liquid
Suitable for PVC plastisols, adhesives and elastomers.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product Name | Antioxidant 1135 |
| Brand | SUNNOX® 1135 |
| CAS No. | 125643-61-0 |
| Chemical Name | Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-, C7–C9 branched alkyl esters |
| Appearance | Clear, light-yellow viscous liquid |
| Assay | ≥98% |
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 1135 is normally used and what to confirm before your trial.
Polyols & Flexible PU Foam
Added to polyol to prevent scorch in slabstock and molded foam, typically 0.1–0.5% on polyol.
Check before trial
- Polyol type and foam grade
- Foam density and block size
- Current anti-scorch package
PVC & Plastisols
Liquid antioxidant for PVC compounds and plastisols.
Check before trial
- Formulation and plasticizer
- Processing temperature
- Color target
Adhesives, Elastomers & Lubricants
Used in hot-melts, elastomers and lubricants where a liquid antioxidant is preferred.
Check before trial
- Base polymer or oil
- Operating temperature
- Existing antioxidant
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® 1135 | Hindered phenol · liquid | ~390 | Liquid | Polyols, PU foam, PVC, adhesives | 0.1–0.5% |
| SUNNOX® 1010 | Hindered phenol · primary | 1177.6 | 110–125 °C | Long-term thermal protection | 0.05–0.3% |
| SUNNOX® 1520 | Phenol + thioether · liquid | 424.8 | Liquid | Elastomers, adhesives, lubricants | 0.1–0.5% |
| SUNNOX® 1076 | Hindered phenol · primary | 530.9 | 50–55 °C | Long-term protection, easy dispersion | 0.05–0.3% |
| SUNNOX® DTDTP | Thioester · secondary | 542.9 | Liquid | Heat-aging synergist, pourable | 0.1–0.5% with a phenolic |
*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
Typically 25 kg pails or 200 kg drums; IBC on request. Confirm the pack in the quotation.
Storage
Keep containers closed, away from heat and direct sun. Warm gently and mix before use if the liquid has thickened in cold weather. See the SDS.
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® 1520
Liquid multifunctional phenolic antioxidant for elastomers, adhesives and lubricants.
View product →SUNNOX® 1076
Low-melting hindered phenolic primary antioxidant, easy to disperse in film and compounding.
View product →SUNNOX® DTDTP
Liquid thioester synergist for ABS, PP and adhesives where a pourable additive is easier to dose.
View product →Antioxidant 1135 FAQ
Why use a liquid antioxidant in PU foam?
It dissolves directly in the polyol, so there is no dispersion step and the dose is uniform. That matters for scorch protection in large foam blocks.
What dosage is typical?
0.1–0.5% on polyol is a common range, depending on foam density and block size. Confirm in your foam trial.
Which COA parameters matter?
Assay, color and viscosity. Tell us your incoming limits and we quote against them.
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.
