WESTON™ is an alkyl-aryl phosphite ester antioxidant that provides color and processing stability in polymers that do not require food contact approvals. It is similar to WESTON™ DPDP but with a higher molecular weight and lower phosphorus content.
Appearance: Clear liquid
Specific gravity @ 25°C: 0.938–0.947
Acid number: 0.05 mg KOH/g
Refractive index @ 25°C: 1.4780–1.4810
Phosphorus content: 7.1%
Color (APHA, Pt-Co): 50 max
Molecular weight: 438 g/mol
Flash point (closed cup): 182°C
Viscosity @ 38°C: 12.0 cps
Density @ 25°C: 0.94 g/mL
Vapor pressure @ 5 mm Hg: 190°C
Soluble: Most common aprotic organic solvents
Insoluble: Water
Primary Chemistry:
Phenyl diisodecyl phosphite
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WESTON™ PDDP is an alkyl-aryl phosphite ester antioxidant that provides color and processing stability in polycarbonate, polyurethanes, ABS polymers, PET fibers, and coatings. It also functions as a secondary antioxidant in PVC.
Appearance: Clear liquid
Specific gravity @ 25°C: 0.938–0.947
Acid number: 0.05 mg KOH/g
Refractive index @ 25°C: 1.4780–1.4810
Phosphorus content: 7.1%
Color (APHA, Pt-Co): 50 max
Molecular weight: 438 g/mol
Flash point (closed cup): 182°C
Viscosity @ 38°C: 12.0 cps
Density @ 25°C: 0.94 g/mL
Vapor pressure @ 5 mm Hg: 190°C
Soluble: Most common aprotic organic solvents
Insoluble: Water
Primary Chemistry:
Phenyl diisodecyl phosphite
Low phosphorus content or molecular weight in phosphite ester antioxidants or stabilizers
Heat or color stability issues in non-food PVC polymers or applications
PET fiber
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