Description

Antioxidant 245 CAS NO 36443-68-2 is a high-performance, sterically hindered phenolic antioxidant widely used to protect polymers from thermal and oxidative degradation. Its primary value lies in its excellent compatibility and low volatility, ensuring long-term stability for demanding applications. This antioxidant is essential for manufacturers in the plastics, synthetic fiber, and rubber industries who require reliable protection for their products against aging and embrittlement.

Application

• Polyolefin Stabilization: Primary antioxidant for polypropylene (PP) and high-density polyethylene (HDPE) in fibers, films, and molded articles.
• Engineering Plastics: Thermal stabilizer for polyamides (PA), polyacetals (POM), and other engineering resins used in automotive and electrical components.
• Synthetic Fibers: Protects polypropylene and polyester fibers during high-temperature melt processing and extends the service life of finished textiles.
• Adhesives and Sealants: Prevents oxidative cross-linking and maintains viscosity stability in hot-melt and reactive adhesive formulations.
• Elastomers and Rubber: Used in synthetic rubbers like EPDM and SBR to prevent cracking and loss of elasticity.
• Polymer Masterbatches: A key component in concentrated additive packages for easy dispersion and precise dosing in polymer production.

Basic Information

Product Name	Antioxidant 245
CAS No.	36443-68-2
Molecular Formula	C34H50O3
Molecular Weight	506.8 g/mol
Synonyms	Tris(2,4-di-tert-butylphenyl) phosphite; Irgafos 168 (part of blend); Antioxidant 168 (common industry name); Phosphite stabilizer 168; Tris(2,4-di-tert-butylphenyl) phosphite; AO-168; 2,4-Di-tert-butylphenyl phosphite (tris); Hostanox PAR 24
EINECS	253-149-0

Quality Control

Our production of Antioxidant 245 adheres to stringent quality management systems to ensure batch-to-batch consistency and high purity. The product is manufactured and tested in facilities that follow cGMP guidelines. Comprehensive quality testing includes identity confirmation, assay, and impurity profiling. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee compliance with your specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after initial opening 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	182 - 186 °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.