What Is DSTDP? Utilisations, CAS Number and Supplier Guide
What Is DSTDP?
DSTDP (Thiodipropionate de distéaryle, CAS 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
- Numéro CAS: 693-36-7
- Molecular weight: 683.2 g/mole
- Apparence: White waxy solid or powder
- Point de fusion: 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 (PP) fibre, film, and compounds
- Polyethylene pipe and geomembranes
- Automotive PP compounds
- Cable jacketing and insulation
Typical use: paired with Antioxidant 1010 ou 1076 at 0.1–0.3% combined loading.
Purchasing Information
- Standard purity: ≥99.0% (HPLC)
- Emballage: 25 kg kraft bags or fiber drums
- Quantité minimale de commande: 100 kg–1 MT (export agent); 1–5 MT (direct factory)
- Lead time: 7–15 business days production + sea freight
- Shelf life: 2 years in sealed, cool, dry storage
FAQ
What is the CAS number for DSTDP?
CAS 693-36-7. Synonym: Distearyl 3,3′-thiodipropionate.
What is the difference between DSTDP and DLTDP?
DSTDP has C18 chains (MW 683); DLTDP has C12 chains (MW 515). DSTDP has lower volatility and performs better at higher processing temperatures.
Is DSTDP approved for food contact?
Oui, 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 (COA, FDS, DT) and export support. Contactez-nous for pricing, échantillons, or technical questions.