Non-staining
Keeps white and light-colored rubber and latex goods clean.
SUNNOX® 425
Antioxidant 425 Supplier for Rubber and Latex
SUNNOX® 425 is a non-staining bisphenol antioxidant for natural and synthetic rubber, latex and adhesives, protecting light-colored products against heat and oxidation.
CAS 88-24-4 · Bisphenol · Primary antioxidant
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
Antioxidant 425 (2,2'-methylenebis(4-ethyl-6-tert-butylphenol)) is closely related to 2246 and is widely used in latex and light-colored rubber articles where staining and discoloration are not acceptable.
Latex use
Widely used in latex articles.
Heat-aging protection
Protects against heat and oxygen in processing and service.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product Name | Antioxidant 425 |
| Brand | SUNNOX® 425 |
| CAS No. | 88-24-4 |
| Chemical Name | 2,2'-Methylenebis(4-ethyl-6-tert-butylphenol) |
| Molecular Formula | C25H36O2 |
| Molecular Weight | 368.6 |
| Appearance | White powder |
| Melting Point | ≥119 °C |
| 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 425 is normally used and what to confirm before your trial.
Latex Products
Non-staining antioxidant for latex gloves, foam and dipped goods.
Check before trial
- Latex type
- Dispersion method
- Color requirement
Natural & Synthetic Rubber
Typically 0.5–1.5 phr in light-colored rubber goods.
Check before trial
- Rubber type
- Cure system
- Heat-aging requirement
Adhesives
Antioxidant for rubber-based adhesives.
Check before trial
- Base polymer
- 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 |
|---|---|---|---|---|
| SUNNOX® 425 | Bisphenol · primary | 368.6 | ≥119 °C | Non-staining rubber and latex antioxidant |
| SUNNOX® 2246 | Bisphenol · primary | 340.5 | ≥125 °C | Non-staining rubber and plastic antioxidant |
| SUNNOX® BBMC | Bisphenol · primary | 382.6 | ≥209 °C | Non-discoloring rubber and adhesive antioxidant |
| SUNNOX® BHT | Hindered phenol · primary | 220.4 | ≥69 °C | Low-cost general antioxidant |
| SUNNOX® 1076 | Hindered phenol · primary | 530.9 | 50–55 °C | Long-term protection, easy dispersion |
Set the levels in your own trial. 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.
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
Regular grades are usually in stock. For large volumes, lead time is confirmed in the quotation. We quote FOB and CIF.
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® BBMC
Non-discoloring bisphenol antioxidant for rubber, adhesives and polyolefins.
View product →SUNNOX® BHT
Low-cost, low-MW phenolic antioxidant for oils, fuels, rubber and general-purpose polymers.
View product →SUNNOX® 1076
Low-melting hindered phenolic primary antioxidant, easy to disperse in film and compounding.
View product →Antioxidant 425 FAQ
425 or 2246?
Both are non-staining bisphenols with similar performance; 425 is often specified in latex. Send your current grade and we match it.
How much SUNNOX® 425 should I add?
The level depends on your polymer, part thickness, other additives and test conditions, so set it in your own trial. The TDS is available on request.
Is it used in plastics?
Mainly in rubber, latex and adhesives; for plastics, 1010, 1076 or 2246 are more common.
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.
