Distearyl thiodipropionate CAS 693-36-7

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CAS:693-36-7

Molecular Formula:C42H82O4S

Molecular Weight:683.16

EINECS:211-750-5

The melting point of antioxidant DSTP is 63-69 ° C. The antioxidant DSTP is soluble in benzene, chloroform, carbon disulfide and carbon tetrachloride, insoluble in dimethylformamide and toluene and insoluble in acetone, ethanol and water. The antioxidant DSTP can give the material excellent long-term thermal stability and is often used in combination with phenolic antioxidants. White crystalline powder.

Item	Specification
Melting point	65-67°C
Boiling point	664.53°C
Density	0.8994
Maximum wavelength (λmax)	410nm(H2O)(lit.)
Refractive index	1.5220
LogP	17.7 at 25℃

Distearyl Thiodipropionate (DSTDP) is a sulfur-containing auxiliary antioxidant widely used in polymer stabilization systems. As a thioester antioxidant, DSTDP works synergistically with hindered phenolic antioxidants to improve long-term thermal aging resistance, especially in polyolefin and elastomer applications exposed to prolonged heat conditions.

1. Polypropylene & Polyethylene Stabilization

DSTDP is extensively used in polypropylene, polyethylene, HDPE pipe compounds, and recycled polyolefin materials where long-term thermal stability is required. It effectively decomposes peroxide radicals formed during polymer aging and helps reduce embrittlement caused by oxidative degradation.

Typical applications include:

PP injection molding
PE pipe compounds
BOPP film
rotational molding materials
recycled plastic pellets

For optimized stabilization performance, DSTDP is commonly formulated with primary antioxidants such as Antioxidant 1010 or Antioxidant 1076.

2. Wire & Cable Insulation Systems

The product is highly suitable for wire & cable compounds requiring excellent long-term heat aging resistance. In PE and EVA insulation materials, DSTDP helps maintain flexibility and reduces oxidative cracking under continuous thermal exposure.

XLPE cable insulation
communication cable sheathing
automotive wire compounds
low-smoke halogen-free cable materials

3. Rubber & Elastomer Applications

DSTDP performs well in synthetic rubber, nitrile rubber, EPDM, SBS, and thermoplastic elastomer systems. It improves resistance to thermal oxidation and extends the service life of elastomer products operating under elevated temperatures.

Typical rubber applications include:

automotive seals
conveyor belts
industrial hoses
footwear compounds
rubber sheets

4. EVA & Hot Melt Adhesives

In EVA-based hot melt adhesives and pressure-sensitive adhesive systems, DSTDP helps suppress viscosity increase and oxidation caused by long-term heating in adhesive tanks. It also improves storage stability in tackifier resin formulations.

For adhesive formulations requiring low volatility and enhanced thermal resistance, DSTDP can be used alongside IRGANOX 3052.

5. ABS & Engineering Resin Compounds

DSTDP is also suitable for ABS, HIPS, styrenic copolymers, and engineering plastic systems where long-term thermal stabilization and reduced discoloration are important.

Explore more sulfur antioxidants and polymer stabilization additives in the Antioxidant Product Category or browse additional polymer processing materials in the Product Collection.

High-efficiency sulfur-containing secondary antioxidant
Excellent long-term thermal aging resistance in polyolefins
Strong synergistic effect with hindered phenolic antioxidants
Effective peroxide decomposition capability during polymer aging
Low volatility and excellent extraction resistance
Improves flexibility retention in wire & cable insulation systems
Suitable for PP, PE, EVA, ABS, rubber, and elastomers
Helps reduce thermal cracking and oxidative embrittlement
Good processing stability under high-temperature conditions
Reliable industrial supply from Unisunchem

25kg/drum or according to customer requirements.

Q1: What is the difference between DSTDP and DLTDP?

DSTDP (Distearyl Thiodipropionate) has longer alkyl chains and lower volatility than DLTDP, making it more suitable for high-temperature polymer applications and long-term thermal aging resistance.

Q2: Why is DSTDP used together with phenolic antioxidants?

DSTDP is a secondary sulfur antioxidant that works synergistically with primary phenolic antioxidants such as Antioxidant 1010. The combination provides both processing stabilization and long-term oxidation resistance in polymers.

Q3: Is DSTDP suitable for wire & cable applications?

Yes. DSTDP is widely used in wire & cable insulation compounds because it improves long-term heat aging performance and helps maintain flexibility under continuous thermal exposure.

Q4: Why is DSTDP preferred in polypropylene stabilization systems?

Polypropylene is highly sensitive to thermal oxidation during long-term use. DSTDP helps decompose hydroperoxides generated during aging and significantly improves long-term heat resistance in PP applications.

Q5: Can DSTDP be used in recycled plastics?

Yes. DSTDP is commonly used in recycled PE and PP compounds to improve thermal stability and compensate for antioxidant loss caused by multiple processing cycles.