Heat-aging synergist
With a phenolic antioxidant it extends oven-aging life far beyond either component alone.
DSTDP Thioester Antioxidant Supplier
SUNNOX® DSTDP (distearyl thiodipropionate) is a thioester secondary antioxidant with low volatility. Combined with a phenolic primary, it extends the heat-aging life of polyolefins, ABS and rubber.
CAS 693-36-7 · Thioester · Secondary antioxidant
Product Overview
DSTDP decomposes hydroperoxides during long service at elevated temperature and works in strong synergy with hindered phenols such as 1010. Its longer alkyl chains give a higher melting point (63–69 °C) and lower volatility than DLTDP, which suits higher processing temperatures and parts that stay hot in use.
Typical specification. Every shipment is supplied with a batch COA; the limits that apply to your order are confirmed in the quotation and contract.
Key Benefits
Lower volatility
Higher molecular weight than DLTDP, so less is lost at high processing temperatures.
Proven in polyolefins
Widely used in PP and PE parts for appliances, automotive and pipe.
Technical Specifications
Typical specification. Every shipment is supplied with a batch COA; the limits that apply to your order are confirmed in the quotation and contract.
| Parameter | Typical value |
|---|---|
| Product Name | Antioxidant DSTDP |
| Brand | SUNNOX® DSTDP |
| CAS No. | 693-36-7 |
| Chemical Name | Distearyl 3,3'-thiodipropionate |
| Molecular Formula | C42H82O4S |
| Molecular Weight | 683.2 |
| Appearance | White powder or flake |
| Melting Point | 63–69 °C |
| Acid Value | ≤0.05 mg KOH/g |
| Volatile Matter | ≤0.05% |
Applications by Polymer
Pick an application to see how DSTDP is normally used and what to confirm before your trial.
Polyolefins
Used with 1010 in PP and PE parts with long heat-aging requirements; phenolic:DSTDP ratios of 1:1 to 1:3 are common.
What to confirm for your application
- Heat-aging test (temperature, hours)
- Phenolic antioxidant and level
- Odor requirements
ABS & Styrenics
Improves long-term heat stability of ABS and HIPS with a phenolic antioxidant.
What to confirm for your application
- Grade and other additives
- Service temperature
- Color target
Rubber & Adhesives
Used as a heat-aging synergist in rubber compounds and adhesives.
What to confirm for your application
- Base polymer
- Cure and service temperature
- Existing antioxidant package
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.
Technical & Buying Information
Antioxidant DSTDP Buyer Guide
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.
Request a Quotation for Antioxidant DSTDP
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 Antioxidants
SUNNOX® DLTDP
Thioester secondary antioxidant that boosts long-term heat aging when used with a phenolic.
View product →SUNNOX® 1010
High-MW hindered phenolic primary antioxidant for long-term thermal protection with low volatility.
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 DSTDP FAQ
DSTDP or DLTDP?
Choose DSTDP for higher processing temperatures and lower volatility; choose DLTDP when you need easy dispersion at low temperature.
What ratio with 1010?
1:1 to 1:3 (1010:DSTDP) is a common starting range for heat-aging packages. Confirm in your oven-aging test.
Can I use DSTDP with HALS?
Thioesters can reduce HALS efficiency in outdoor applications. For outdoor parts, tell us the package and we suggest an alternative synergist if needed.
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.
Discuss Your Antioxidant DSTDP Requirements
Send your application, specification and quantity to request a quotation or supporting documents.