Highly effective, phosphite-based color and molecular weight stabilizer for polymers, elastomers, and adhesives, similar to WESTON™ 618F but with improved hydrolytic stability.
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WESTON™ 619F is a phosphite antioxidant similar to WESTON™ 618F with improved hydrolytic stability. It is highly effective at stabilizing color and molecular weight for a variety of polymers, elastomers, and adhesives. WESTON™ 619F contributes to the thermal and UV stability of these materials as well.
Appearance: White flakes
Specific Gravity @ 15.5 °C: 0.92-0.935
Acid Number: 1.0 mg KOH/g
Refractive Index @ 60 °C: 1.456-1.459
Phosphorus Content: 7.8-8.2%
Flash Point (Closed Cup): 188 °C
Bulk Density: 0.43 g/mL
Melting Point: 37-46 °C
Molecular Weight: 732 g/mol
Primary Chemistry: Distearyl Pentaerythritol Diphosphite
Food contact approvals
Excellent color stability during processing, fabrication, and end use
Synergizes when used with benzophenone and benzotriazole light stabilizers
Reduced discoloration of polymers containing pigments like TiO₂
High performance at low loading levels
Reduces discoloration of polymers with high processing temperatures that are stabilized with a sulfur-containing, nickel-organic complex
Low hydrolytic stability of solid phosphite antioxidants
Discoloration issues in polymeric formulations caused by TiO2 pigments
Poor thermal and UV stability of adhesives and elastomeric formulations
Synergy and incompatibility issues of phosphite antioxidants with benzophenone and benzotriazole light stabilizers
Polyolefins, polyesters, elastomers, styrenics, engineering thermoplastics, and adhesives
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