Two functions in one
Phenolic and thioether groups in one molecule simplify the package.
SUNNOX® 1520
Antioxidant 1520 Liquid Antioxidant Supplier
SUNNOX® 1520 is a liquid multifunctional phenolic antioxidant with built-in thioether groups. It protects elastomers, adhesives and lubricants with a single, easy-to-dose additive.
CAS 110553-27-0 · Phenol + thioether · Liquid
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
Antioxidant 1520 (2,4-bis(octylthiomethyl)-6-methylphenol) combines a hindered phenol and thioether functions in one molecule, giving both radical-scavenging and hydroperoxide-decomposing action. It is used in synthetic rubbers (SBR, BR, SBS, SIS), hot-melt adhesives and lubricants, and is easy to meter as a liquid.
Liquid dosing
Easy to add to rubber latex, solutions and adhesives.
Elastomer protection
Protects SBR, BR and SBS during finishing, storage and processing.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product Name | Antioxidant 1520 |
| Brand | SUNNOX® 1520 |
| CAS No. | 110553-27-0 |
| Chemical Name | 2,4-Bis(octylthiomethyl)-6-methylphenol |
| Molecular Formula | C25H44OS2 |
| Molecular Weight | 424.8 |
| Appearance | Colorless to light-yellow 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 1520 is normally used and what to confirm before your trial.
Synthetic Rubber (SBR, BR, SBS)
Added at the finishing stage of rubber production to protect against oxidation in storage and processing.
Check before trial
- Rubber type and process stage
- Storage time and temperature
- Color requirements
Hot-melt & Pressure-sensitive Adhesives
Protects SBS and SIS adhesives in the melt tank and in service.
Check before trial
- Base polymer and tackifier
- Melt-tank temperature
- Color stability target
Lubricants & Oils
Antioxidant for lubricants and greases.
Check before trial
- Base oil
- Operating temperature
- Existing additive package
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® 1520 | Phenol + thioether · liquid | 424.8 | Liquid | Elastomers, adhesives, lubricants | 0.1–0.5% |
| SUNNOX® 1135 | Hindered phenol · liquid | ~390 | Liquid | Polyols, PU foam, PVC, adhesives | 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 |
| SUNNOX® 2246 | Bisphenol · primary | 340.5 | ≥125 °C | Non-staining rubber and plastic antioxidant | 0.5–1.5 phr in rubber |
*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® 1135
Liquid phenolic antioxidant for polyols, PU foam, PVC and adhesives; easy to meter.
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 1520 FAQ
Does 1520 need a separate thioester?
Usually not: its built-in thioether groups give the synergy that other packages get from adding DLTDP or DSTDP.
What dosage is typical in rubber?
Commonly 0.1–0.5%, depending on rubber type and storage requirements. Confirm in your trial.
Is 1520 used in polyolefins?
Less often; it is mainly used in elastomers, adhesives and oils. For polyolefins 1010 + 168 is the usual choice.
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.
