WESTON™ 439 is a phosphite ester antioxidant designed to improve the color, clarity, and light stability of PVC and vinyl chloride copolymers.
WESTON™ 439 is a phosphite ester antioxidant that improves the color, light stability, and optical transparency of PVC and vinyl chloride copolymers. WESTON™ 439 offers high performance for PVC when used alongside primary metal stabilizers and epoxy stabilizers.
Form: Liquid
Color: Clear
CAS number: 96152-48-6
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
Insolubility: Wate
Primary Chemistry: Poly 4,4' isopropylidenediphenol C12-15 alcohol phosphite
Approved for food contact when used in PVC
Improves optical transparency
Soluble in most common aprotic organic solvents
Synergizes with primary metal stabilizers and epoxy stabilizers
Clarity or color stability issues in PVC or vinyl polymers
Degradation or staining in PVC when exposed to light or processing temperatures
Packaging
Consumer goods
Building and construction
Automotive
Appliances
Windows
Decks
Flooring
Fences
The portfolio of WESTON™ liquid phosphite antioxidants offers excellent synergism, improved color, and processing stability and offers a variety of food contact approvals depending on your plastic applications.
The SI Group's extensive portfolio of specialty antioxidants and UV stabilizers holds the solution to your TPO roof membrane formulating challenges.
The SI Group portfolio of WESTON™ phosphite antioxidants protects plastics and elastomers from peroxide decomposers and offers excellent synergism with primary antioxidants, such as hindered phenols.
SI Group offers a broad range of plastic additives for the stability and durability of your packaging plastics. Learn more today!
SI Group polymer solutions are essential for the long-term performance benefits for countless building and construction plastic applications.
Compounders and recyclers face multiple challenges with the stabilization and processing of recycled plastics. Learn more and explore our solutions
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