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Versatile aryl phosphite ester antioxidant that regulates viscosity, improves color, and prevents scorch in a variety of polymers.


518.08lb Drum



Product Overview

WESTON™ TPP is a phosphite ester antioxidant that can be used in a variety of materials, including adhesives, coatings, styrenics, and polyurethanes to improve color stability, prevent scorch, and regulate viscosity. Acts as a catalyst adjuvant when used in polyolefins.

Product Specifications

Appearance: Clear liquid
Specific Gravity @ 25 °C: 1.180-1.186
Acid Number: 0.20 mg KOH/g max
Refractive Index @ 25 °C: 1.5880-1.5900
Phosphorus Content: 10%
Color (APHA, Pt/Co): 50 max
Molecular Weight: 310 g/mol
Flash Point (Closed Cup): 146 °C
Viscosity @ 38 °C: 10.2 cps
Density @ 25 °C: 1.18 g/mL
Vapor Pressure @ 5 mm Hg: 205 °C
Soluble: Most aprotic organic solvents
Insoluble: Water
Primary Chemistry: Triphenyl Phosphite

Features & Benefits

Regulates viscosity and improves color stability in polyester
Catalyst adjuvant in polyolefins
Prevents scorch during curing in polyurethanes


Styrenics, engineering thermoplastics

Related Products

SI Group Phosphite Antioxidants

SI Group Phosphite Antioxidants are solid and liquid secondary antioxidants that work in a variety of systems.

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