WESTON™ TNPP is a versatile phosphite stabilizer that improves color, processing stability, and the end use of a variety of polymers; similar to WESTON® 399, but with a higher flash point.
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WESTON™ TNPP is a cost-effective 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 alongside hindered phenolic antioxidants.
Appearance: Clear liquid
Specific gravity @ 25°C: 0.980–0.992
Color (Pt-Co): 75 max
Flash point (closed cup): 207°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: 0.05 mg KOH/g
Refractive index @ 25 °C: 1.5250–1.5280
Free nonylphenol content: 3.0%
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)
Autoignition temperature: 439°C
Primary Chemistry: Trisnonylphenyl phosphite
Low color
Low nonylphenol content
Synergizes when used alongside phenolic antioxidants
Food contact approvals
Low flashpoint of liquid phosphite antioxidants
High level of nonylphenols in liquid phosphite antioxidants
Incompatibility or synergy issues of phosphite antioxidants with hindered phenolic antioxidants
High-density polyethylene
Linear low-density polyethylene
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