Phosphite ester antioxidant designed to improve color, clarity, and light stability of PVC and vinyl chloride copolymers.
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WESTON™ 439 is a phosphite ester antioxidant that improves the color, light stability and optical transparency of PVC and vinyl chloride copolymers. It improves performance of the polymer when used along side primary metal stabilizers and epoxy stabilizers.
Appearance: Clear liquid
Color (Pt - Co): 50 max
Acid Number: 0.20 mg KOH/g max
Refractive Index @ 25 °C: 1.5040-1.5095
Phosphorus Content: 5.4%
Specific Gravity @ 25 °C: 0.965-0.990
Vapor Pressure @ 6 mm Hg: 175 °C
Flash Point (Closed Cup): 177 °C
Soluble: Most common aprotic organic solvents
Insoluble: Water
Primary Chemistry: Poly 4,4' Isopropylidenediphenol C₁₂-₁₅ Alcohol Phosphite
Clarity and color stability issues in PVC and vinyl polymers
Degradation and staining in PVC when exposed to light and processing temperatures
Vinyl chloride copolymers
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