Description

Tetraphenyl Dipropyleneglycol Diphosphite is a high-performance organophosphite compound widely used as a stabilizer and antioxidant in polymer processing. This chemical is valued for its effectiveness in preventing thermal and oxidative degradation, thereby extending the service life and maintaining the properties of sensitive materials. It is an essential additive for manufacturers in the plastics, synthetic resins, and specialty polymer industries seeking to enhance product durability and performance under demanding conditions.

Application

• Primary stabilizer and antioxidant in polyolefins (PP, PE) and other polymers to prevent thermal degradation during processing.
• Used as a color stabilizer in engineering plastics and synthetic fibers to maintain clarity and prevent yellowing.
• Effective secondary antioxidant in combination with primary phenolic antioxidants for synergistic stabilization systems.
• Applied in the production of adhesives, sealants, and elastomers to improve aging resistance.
• Utilized as a process stabilizer in polymer resin manufacturing to protect against high-temperature shear.
• Employed in specialty coatings formulations to enhance UV and oxidative stability.

Basic Information

Product Name	Tetraphenyl Dipropyleneglycol Diphosphite
CAS No.	33774-78-6
Molecular Formula	C30H32O6P2
Molecular Weight	574.51 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (common trade name); Phosphorous acid, cyclic butylethylene ester, tetraphenyl derivative; Pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate) diphosphite analog; Antioxidant 626 (industry code); Dipropylene glycol, tetraphenyl diphosphite; Tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylene diphosphonite (related IUPAC); Hostanox PAR 24 (possible trade variant); Irgafos 126 (common trade name equivalent)
EINECS	Contact for details

Quality Control

Our Tetraphenyl Dipropyleneglycol Diphosphite is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets high-purity specifications and performance criteria typical for polymer additive applications. A Certificate of Analysis (COA) detailing purity, assay, and key physical parameters is provided with each shipment to guarantee traceability and compliance.

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 sealed when not in use to prevent degradation from atmospheric moisture. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	185 - 195 °C
Volatile Matter	≤ 0.5 %
Acidity (as H3PO4)	≤ 0.1 %
Solution Color (APHA)	≤ 50

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