Description

Tris(2,5-Di-T-Butyl-4-Hydroxypphenyl) Phosphite is a high-performance organophosphite antioxidant widely used to protect polymers from thermal and oxidative degradation. Its primary value lies in its ability to act as a highly effective secondary antioxidant, synergizing with primary phenolic antioxidants to significantly extend the service life of plastics and synthetic materials. This compound is essential for manufacturers in the plastics, rubber, and polymer industries seeking to enhance the durability and color stability of their products under demanding processing and end-use conditions.

Application

• As a secondary antioxidant and stabilizer in polyolefins (PP, HDPE, LDPE) to prevent chain scission and maintain molecular weight during processing.
• To improve long-term thermal stability and color retention in engineering plastics such as ABS, polystyrene, and polycarbonate.
• In synergistic stabilization systems combined with primary phenolic antioxidants (e.g., BHT, Irganox 1010) for enhanced polymer protection.
• For the stabilization of adhesives, elastomers, and synthetic rubbers against heat aging.
• Used in the production of food-grade polymer packaging materials, where regulatory-compliant stabilization is required.
• As a processing stabilizer in fiber and film applications to prevent yellowing and embrittlement.

Basic Information

Item	Detail
Product Name	Tris(2,5-Di-T-Butyl-4-Hydroxypphenyl) Phosphite
CAS No.	7390-40-1
Molecular Formula	C42H63O6P
Molecular Weight	694.92 g/mol
Synonyms	Tris(2,5-di-tert-butyl-4-hydroxyphenyl) phosphite; Tris(2,5-di-t-butyl-4-hydroxyphenyl) phosphite; Phosphorous acid tris(2,5-di-tert-butyl-4-hydroxyphenyl) ester; Antioxidant 168; Irgafos 168; Hostanox PAR 24; AO-168; Tris(4-hydroxy-3,5-di-tert-butylphenyl) phosphite
EINECS	230-981-5

Quality Control

Our production of Tris(2,5-Di-T-Butyl-4-Hydroxypphenyl) Phosphite adheres to stringent quality management systems to ensure batch-to-batch consistency and high purity. The product is manufactured and tested in compliance with ISO 9001 standards, and relevant grades meet the requirements for use in food contact applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and key physical parameters is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	183 - 187 °C
Loss on Drying	≤ 0.5 %
Ash Content	≤ 0.1 %
Solution Color (10% in Toluene)	≤ 50 APHA

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