Long-term heat aging
Synergy with phenolic antioxidants extends oven-aging life well beyond the phenolic alone.
SUNNOX® DLTDP
DLTDP Thioester Antioxidant Supplier
SUNNOX® DLTDP (dilauryl thiodipropionate) is a thioester secondary antioxidant. Used with a phenolic primary such as 1010 or 1076, it markedly extends long-term heat aging in polyolefins, ABS and rubber.
CAS 123-28-4 · Thioester · Secondary antioxidant
- Lot COA with every shipment
- Samples for your trials
- Technical support for your trial
Product overview & key benefits
DLTDP decomposes hydroperoxides into stable products, so it removes the fuel for continued oxidation during long service at elevated temperature. On its own it is a weak antioxidant; combined with a hindered phenol it gives a strong synergy for heat-aging performance. Typical blends run at 1:1 to 1:3 phenolic:DLTDP.
Low melting point
Melts at 38–42 °C and disperses easily in compounding and masterbatch.
Cost-effective boost
Often lets you hold or reduce the phenolic level for the same heat-aging target.
Technical specifications
| Parameter | Typical value |
|---|---|
| Product Name | Antioxidant DLTDP |
| Brand | SUNNOX® DLTDP |
| CAS No. | 123-28-4 |
| Chemical Name | Dilauryl 3,3'-thiodipropionate |
| Molecular Formula | C30H58O4S |
| Molecular Weight | 514.8 |
| Appearance | White crystalline powder or flake |
| Melting Point | 38–42 °C |
| Acid Value | ≤0.05 mg KOH/g |
| Volatile Matter | ≤0.05% |
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 DLTDP is normally used and what to confirm before your trial.
Polyolefins
Used with 1010 or 1076 in PP and PE parts that must pass long oven-aging tests, such as appliance and automotive components.
Check before trial
- Heat-aging test (temperature, hours)
- Phenolic antioxidant and its level
- Odor requirements for the part
ABS & Styrenics
Improves heat-aging of ABS and HIPS together with a phenolic antioxidant.
Check before trial
- Grade and other additives
- Service temperature
- Color target
Rubber, Adhesives & Lubricants
Used in rubber, hot-melts and lubricants as a heat-aging synergist.
Check before trial
- Base polymer or oil
- Operating temperature
- Existing antioxidant 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® DLTDP | Thioester · secondary | 514.8 | 38–42 °C | Heat-aging synergist | 0.1–0.3% with a phenolic |
| SUNNOX® DSTDP | Thioester · secondary | 683.2 | 63–69 °C | Heat-aging synergist, lower volatility | 0.1–0.3% with a phenolic |
| SUNNOX® 1010 | Hindered phenol · primary | 1177.6 | 110–125 °C | Long-term thermal protection | 0.05–0.3% |
| 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
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® DSTDP
Higher-melting thioester synergist with lower volatility for long-term heat aging.
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 DLTDP FAQ
Can DLTDP be used alone?
It is not effective alone. Use it with a hindered phenolic antioxidant; a 1:1 to 1:3 phenolic:DLTDP ratio is a common starting point.
DLTDP or DSTDP?
Both work the same way. DSTDP has a higher melting point (63–69 °C) and lower volatility; DLTDP (38–42 °C) disperses more easily at low processing temperatures.
Does DLTDP affect odor or color?
Thioesters can add slight odor at high loadings and can interact with HALS in outdoor packages. Tell us the end use and we suggest the right balance.
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.
