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WESTON™ 399
Versatile phosphite stabilizer that improves color, processing stability, and end-use of a variety of polymers; similar to WESTON™ 398 but with food contact approvals.
WESTON™ 399 is a phosphite antioxidant that improves color and processing stability during recovery, drying, compounding, processing and end use. It has low nonylphenol content, is approved for food contact, and synergizes when used along side hindered phenolic antioxidants.
Specifications
Appearance: Clear liquid Specific Gravity @ 25 °C: 0.980-0.992 Color (Pt - Co): 75 max Flash Point (Closed Cup): 196 °C Density @ 25 °C: 0.98 g/mL Vapor Pressure @ 6 mm Hg: 245 °C Molecular Weight: 688 g/mol Viscosity @ 60 °C: 250 cps Acid Number: 0.25 mg KOH/g max Refractive Index @ 25 °C: 1.5250-1.5280 Free Nonylphenol Content: 4.0% max Phosphorus Content: 4.1-4.5% Chlorine Content: <25 ppm Free Phenol Content: <50 ppm Specific Heat: 0.4 mcal/mg°C Thermal Conductivity: 0.0003 gcal/sec(cm²)(°C/cm) Auto-ignition Temperature: 439 °C
Primary Chemistry: Trisnonylphenyl Phosphite
Features & Benefits
Low color Low nonylphenol content Food contact approvals Synergizes when used along side phenolic antioxidants
Problems Solved
FDA clearance of liquid phosphite antioxidants for use in food contact applications Synergy issues of liquid phosphite antioxidants with hindered phenolic antioxidants Regulatory restrictions on the level of nonylphenols in a formulation
Applications
High density polyethylene, linear low density polyethylene
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.
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