Description

Dioctadecyl 3,3'-Dithiobispropionate is a high-molecular-weight organosulfur compound primarily utilized as an antioxidant and stabilizer. Its core value lies in its ability to effectively inhibit oxidative degradation and thermal decomposition in various polymeric systems. This product is essential for manufacturers in the plastics, rubber, and lubricant industries seeking to enhance the longevity and performance stability of their materials under demanding conditions.

Application

• Polymer Stabilization: Acts as a highly effective antioxidant and heat stabilizer in polyolefins (e.g., polyethylene, polypropylene), preventing chain scission and discoloration during processing and long-term use.
• Rubber Industry: Used as a non-staining, non-discoloring antioxidant in synthetic rubbers and elastomers to protect against heat aging and maintain mechanical properties.
• Lubricant & Grease Additive: Functions as an oxidation inhibitor in industrial lubricants, greases, and transformer oils, extending service life and preventing sludge formation.
• Adhesive & Sealant Formulations: Enhances the thermal-oxidative stability of hot-melt adhesives, sealants, and other polymer-based formulations.
• Food Contact Materials: May be employed in stabilizer systems for polymers used in packaging applications, subject to relevant regulatory compliance (e.g., FDA, EU).
• Wire & Cable Insulation: Protects the polymer insulation in wires and cables from degradation caused by heat exposure during operation and installation.

Basic Information

Product Name	Dioctadecyl 3,3'-Dithiobispropionate
CAS No.	6729-96-0
Molecular Formula	C42H82O4S2
Molecular Weight	715.23 g/mol
Synonyms	Distearyl 3,3'-Thiodipropionate; Distearyl Thiodipropionate; DSTDP; Dioctadecyl Thiodipropionate; 3,3'-Thiobispropanoic Acid Dioctadecyl Ester; Antioxidant DSTDP; Evanstab® 18; Irganox® PS 802; Lankromark® DSTDP; AO-18
EINECS	229-813-0

Quality Control

Our Dioctadecyl 3,3'-Dithiobispropionate is manufactured under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, melting point, and appearance. A comprehensive Certificate of Analysis (COA) documenting these results is provided with every shipment to guarantee traceability and compliance with your quality assurance protocols.

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 strong oxidizing agents and heat sources.

Specification

Item	Specification
Appearance	White crystalline flakes or powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	63 - 69 °C
Acid Value	≤ 1.0 mg KOH/g
Ash Content	≤ 0.1 %
Heavy Metals (as Pb)	≤ 10 ppm

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