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BNX DSTDP (693-36-7) is a thioether-type antioxidant that functions by scavenging peroxides formed during the thermal oxidative degradation of plastics and other organic materials.  Combinations of this product with hindered phenolic antioxidants (e.g. BNX 1010) provide outstanding thermal stability in polyolefins, styrenic polymers, and engineering plastics.  BNX DSTDP is non-discoloring, has good compatibility with polyolefins, styrenic polymers, and adhesives, and has low odor relative to other sulfur-based antioxidants.

Material Description:           Thioether Antioxidant/Heat Stabilizer

Chemical Name:                   Dioctadecyl 3,3’-thiodipropionate

CAS #:                                    693-36-7

Molecular Weight:                683 g/mol

Chemical Structure:

Physical Properties:            Appearance:                   Solid

Melting Point:                  64-67°C Flash Point:                               257oC (Markusson) Solubility in Water:                             <0.1 mg/L


BNX DSTDP is a highly effective to improve the long-term thermal stability in a wide range of resins, adhesives, plastics, and lubricants. Combinations of BNX DSTDP with phenolic primary antioxidants (e.g. BNX 1010, BNX 1035, BNX 1076, and others) provide outstanding long-term thermal stability in polyolefins (polypropylene, polyethylene, TPO, including filled grades) for demanding applications such as pipe, power cables, and under-the-hood automotive components. These systems are also highly useful in styrenic polymers (e.g. ABS, HIPS), hot melt adhesives, and lubricants.


  • Provides excellent protection to polyolefins in high temperature and end use applications
  • Synergistic performance with phenolic primary antioxidants
  • Non-discoloring and non-staining
  • Low odor, low volatility
  • Broad FDA clearances

Guidelines for Use

Recommended concentrations for use in plastics and adhesives range from 0.05 to 1% by weight. Combinations of BNX DSTDP with primary antioxidants (phenolic antioxidants and multifunctional types) provide synergistic performance. BNX DSTDP is also suitable for use in combination with phosphite process stabilizers and light stabilizers (UV absorbers and benzoates). The exact formulation to be used is dependent on the substrate, performance requirements, and other factors, and should be determined by the user based on testing to simulate actual conditions of use. Please contact Mayzo for specific recommendations.


This product may be stored up to two years in a sealed container. Containers should be kept tightly closed when not in use and stored in a cool, dry place.


Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

BNX DSTDP is cleared for use in adhesives under 21 CFR §175.105, in resinous and polymeric coatings under 21 CFR §175.300, in semi-rigid and rigid acrylic and modified acrylic plastics under 21 CFR §177.1010, and as an antioxidant employed in the manufacture of food-packaging materials under prior sanction (21 CFR §181.24). Please contact your Mayzo representative for complete details, including restrictions of use.

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