Technical datasheet

WESTON™ 399 phosphite

Supplied bySI Group- Last Updated on Mar 16, 2026

WESTON™ 399 phosphite by SI Group is phosphite antioxidant stabilizer for HDPE, LLDPE, SBR, ABS and PVC. It improves the color and processing stability during recovery, drying, compounding, processing and end use.
  • Synergism can be established when this product is combined with other stabilizers such as hindered phenols.
  • It phosphite can be added alone or in combination with the monomers and/or in antioxidant emulsions during recovery and/or during compounding.
  • It possesses low color and low nonylphenol content.
  • It is FDA approved.
  • It has a shelf life of 1 year.
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WESTON™ 399 phosphite properties

Other properties

PropertiesValue & unitTest conditionTest method
Acid Value0.0 Visible After LoginVisible After LoginVisible After Login
Auto-ignition Temperature0.0 Visible After LoginVisible After LoginVisible After Login
Chlorine Content0.0 Visible After LoginVisible After LoginVisible After Login
Color, APHA0.0 Visible After LoginVisible After LoginVisible After Login
Density0.0 Visible After LoginVisible After LoginVisible After Login
Flash Point0.0 Visible After LoginVisible After LoginVisible After Login
Formula Weight0.0 Visible After LoginVisible After LoginVisible After Login
Free Nonylphenol Content0.0 Visible After LoginVisible After LoginVisible After Login
Free Phenol Content0.0 Visible After LoginVisible After LoginVisible After Login
Phosphorous Content0.0 Visible After LoginVisible After LoginVisible After Login
Refractive Index0.0 Visible After LoginVisible After LoginVisible After Login
Specific Gravity0.0 Visible After LoginVisible After LoginVisible After Login
Specific Heat Capacity0.0 Visible After LoginVisible After LoginVisible After Login
Thermal Conductivity0.0 Visible After LoginVisible After LoginVisible After Login
Vapor Pressure0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity0.0 Visible After LoginVisible After LoginVisible After Login
Solubility PropertiesElementConditionMethod
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