Description

Diphenyl Pentaerythritol Diphosphite is a high-performance organophosphite antioxidant widely used as a stabilizer in polymer processing. This compound is valued for its effectiveness in preventing thermal and oxidative degradation, thereby extending the service life and maintaining the color of finished polymeric materials. It is an essential additive for manufacturers in the plastics, synthetic fiber, and rubber industries seeking to enhance product durability and performance under demanding conditions.

Application

• Primary antioxidant and processing stabilizer for polyolefins (PP, PE)
• Color and melt flow rate stabilizer in engineering plastics (ABS, PC, PA)
• Synergistic co-stabilizer in PVC formulations
• Stabilizer for synthetic fibers and elastomers to prevent chain scission
• Additive in adhesive and sealant formulations to improve heat aging resistance
• Used in the production of masterbatches and polymer concentrates

Basic Information

Product Name	Diphenyl Pentaerythritol Diphosphite
CAS No.	144-35-4
Molecular Formula	C29H28O6P2
Molecular Weight	534.47 g/mol
Synonyms	Dipentaerythritol Diphosphite; Pentaerythritol Bis(diphenyl phosphite); Bis(2,4-di-tert-butylphenyl) Pentaerythritol Diphosphite; Pentaerythrityl Bis(2,4-di-tert-butylphenyl) Phosphite; Antioxidant 626; PEP-36; Ultranox 626; Doverphos S-686; Irgafos 126; ADK STAB PEP-36; Ethanone, 1,1'-(1,2-ethanediyl)bis[2,4-di-tert-butylphenyl] phosphite
EINECS	205-633-4

Quality Control

Our production of Diphenyl Pentaerythritol Diphosphite adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. The material is manufactured and tested in compliance with relevant industry standards for polymer additives. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and key physical parameters is provided with each shipment to guarantee it meets your specific application requirements.

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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 175 °C
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %

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