June 30, 2026

What Is DSTDP? Использование, CAS Number and Supplier Guide

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What Is DSTDP?

DSTDP (Дистеарил Тиодипропионат, КАС 693-36-7) is a sulfur-based secondary antioxidant used extensively in polyolefin plastics to extend thermal stability and service life. It is one of the most widely specified thioester antioxidants globally.

Chemical Identity

  • Chemical name: Distearyl 3,3′-thiodipropionate
  • Номер CAS: 693-36-7
  • Molecular weight: 683.2 г/моль
  • вид: White waxy solid or powder
  • Температура плавления: 64–67°C
  • Commercial equivalents: Irganox PS 802, Cyanox STDP

How DSTDP Works

The sulfur atom in the thioether linkage acts as a hydroperoxide decomposer. During polymer processing, hydroperoxides form as intermediates in the oxidative degradation chain. DSTDP reduces these to stable alcohols, breaking the chain before further degradation occurs.

Primary Applications

  • Polypropylene (ПП) волокно, фильм, and compounds
  • Polyethylene pipe and geomembranes
  • Automotive PP compounds
  • Cable jacketing and insulation

Typical use: paired with Antioxidant 1010 или же 1076 at 0.1–0.3% combined loading.

Purchasing Information

  • Standard purity: ≥99.0% (HPLC)
  • Упаковка: 25 kg kraft bags or fiber drums
  • минимальный заказ: 100 kg–1 MT (export agent); 1–5 MT (direct factory)
  • Lead time: 7–15 business days production + sea freight
  • Срок годности: 2 years in sealed, cool, dry storage

Часто задаваемые вопросы

What is the CAS number for DSTDP?
КАС 693-36-7. Synonym: Distearyl 3,3′-thiodipropionate.

What is the difference between DSTDP and DLTDP?
DSTDP has C18 chains (МВт 683); DLTDP has C12 chains (МВт 515). DSTDP has lower volatility and performs better at higher processing temperatures.

Is DSTDP approved for food contact?
Да, listed in FDA 21 CFR §178.2010 and EU 10/2011. Application-specific conditions apply — request a compliance letter from your supplier.

Contact SUNCHEM

SUNCHEM supplies DSTDP with full documentation (сертификат подлинности, паспорт безопасности, ТДС) and export support. Связаться с нами for pricing, образцы, or technical questions.

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