Description

Tris(p-tert-Pentylphenyl) Phosphite is a high-performance organophosphite antioxidant widely used as a stabilizer in polymer processing. Its core value lies in its ability to effectively inhibit thermal and oxidative degradation, thereby extending the service life and maintaining the color and physical properties of sensitive materials. This compound is essential for manufacturers in the plastics, rubber, and synthetic fiber industries who require reliable protection against polymer chain scission and discoloration during high-temperature processing and long-term use.

Application

• Primary antioxidant and processing stabilizer for polyolefins (PP, PE) and engineering plastics.
• Color stabilizer and melt flow protector in the production of synthetic fibers and filaments.
• Additive in rubber compounding to prevent scorching and improve aging resistance.
• Stabilizer component in adhesive and sealant formulations to enhance shelf-life and performance stability.
• Protective agent for lubricants and hydraulic fluids against oxidative breakdown.
• Used in the stabilization of polycarbonate and other condensation polymers during extrusion and molding.

Basic Information

Product Name	Tris(p-tert-Pentylphenyl) Phosphite
CAS No.	864-56-2
Molecular Formula	C33H51O3P
Molecular Weight	526.73 g/mol
Synonyms	Tris(4-(1,1-dimethylpropyl)phenyl) phosphite; Phosphorous acid, tris(4-(1,1-dimethylpropyl)phenyl) ester; Tris(4-tert-pentylphenyl) phosphite; Antioxidant TPP; Irgafos P-EPQ (related stabilizer blend); Weston TPP; AO TPP; p-tert-Pentylphenyl phosphite trimer
EINECS	212-734-4

Quality Control

Our Tris(p-tert-Pentylphenyl) Phosphite is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including assay by HPLC, to ensure high purity and consistent performance as a polymer stabilizer. Certificates of Analysis (COA) detailing purity, color, and other critical parameters are provided with every shipment to guarantee compliance with your technical specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) in the container headspace is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Melting Point	180 - 185 °C
Color (APHA)	≤ 50
Phosphorus Content	5.7 - 6.0 %
Acidity (as H3PO4)	≤ 0.05 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.