Description

Distearyl Thiodipropionate CAS NO 693-36-7 is a high-molecular-weight thioester antioxidant widely recognized for its excellent performance as a secondary stabilizer in polymer systems. Its primary value lies in its ability to effectively decompose hydroperoxides, thereby significantly extending the service life and maintaining the physical properties of materials exposed to heat and oxygen. This makes it an essential additive for manufacturers in the plastics, synthetic fiber, and rubber industries seeking to enhance product durability and prevent premature degradation.

Application

• Primary secondary antioxidant in polyolefins (PP, PE) for films, fibers, and molded articles.
• Synergistic stabilizer in combination with primary phenolic antioxidants (e.g., BHT, Irganox 1010) for enhanced heat aging resistance.
• Stabilizer for synthetic rubbers and elastomers to prevent cross-linking and maintain elasticity.
• Additive in adhesives and sealants to improve thermal-oxidative stability.
• Stabilizing agent for polyurethane (PU) foams and other polymeric materials.
• Used in food-contact compliant polymer applications where relevant regulatory approvals are met.

Basic Information

Product Name	Distearyl Thiodipropionate
CAS No.	693-36-7
Molecular Formula	C42H82O4S
Molecular Weight	683.2 g/mol
Synonyms	DSTDP; Di-n-octadecyl 3,3'-thiodipropionate; Dioctadecyl 3,3'-thiodipropionate; Thiodipropionic Acid Distearyl Ester; Bis(stearyl) 3,3'-thiodipropionate; Antioxidant DSTDP; Evanstab® 18; Seenox DS
EINECS	211-750-5

Quality Control

Our Distearyl Thiodipropionate is manufactured under a strict quality management system to ensure batch-to-batch consistency and high purity. The product is tested against rigorous in-house specifications that typically include assay, melting point, acid value, and appearance. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from heat sources and incompatible materials. Under these conditions, the product has excellent shelf stability.

Specification

Item	Specification
Appearance	White flake or powder
Identification (IR)	Conforms
Melting Point	63 - 69 °C
Assay (HPLC)	≥ 98.0 %
Acid Value	≤ 1.0 mg KOH/g
Ash Content	≤ 0.1 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.