Description

Antioxidant Hp136,2(3H)-Benzofuranone,5,7-Bis(1,1-Dimethylethyl)-3-(3,4-Dimethylphenyl) is a high-performance, sterically hindered phenolic antioxidant specifically engineered to inhibit oxidative degradation in polymers and synthetic materials. Its primary value lies in providing exceptional long-term thermal stability, preventing chain scission and discoloration, which is critical for maintaining product integrity and extending service life. This compound is essential for manufacturers in the plastics, rubber, and synthetic fiber industries who require reliable protection against heat and oxidative stress during processing and end-use.

Application

• Polymer Stabilization: Primary antioxidant for polypropylene (PP), polyethylene (PE), and other polyolefins to prevent thermal-oxidative degradation during extrusion and molding.
• Synthetic Rubber Protection: Used in styrene-butadiene rubber (SBR), ethylene-propylene-diene monomer (EPDM), and nitrile rubber (NBR) to enhance aging resistance and durability.
• Engineering Plastics: Effective stabilizer for polymers like polyamide (PA) and polyester (PBT, PET) that are processed at high temperatures.
• Adhesives and Sealants: Imparts stability to hot-melt adhesives and polyurethane-based systems, preventing viscosity change and loss of adhesive properties.
• Lubricant and Fuel Additive: Functions as an antioxidant in industrial lubricants, greases, and fuels to minimize sludge formation and acid generation.
• Masterbatch Production: A key active component in antioxidant and additive masterbatches for simplified and uniform dispersion in final polymer compounds.

Basic Information

Product Name	Antioxidant Hp136,2(3H)-Benzofuranone,5,7-Bis(1,1-Dimethylethyl)-3-(3,4-Dimethylphenyl)
CAS No.	164391-52-0
Molecular Formula	C26H34O2
Molecular Weight	378.55 g/mol
Synonyms	Antioxidant HP-136; 5,7-Di-tert-butyl-3-(3,4-dimethylphenyl)-3H-benzofuran-2-one; 3-(3,4-Dimethylphenyl)-5,7-di-tert-butylbenzofuran-2(3H)-one; HP 136; Irganox HP 136; 2(3H)-Benzofuranone, 5,7-bis(1,1-dimethylethyl)-3-(3,4-dimethylphenyl)-; Antioxidant 136
EINECS	Contact for details

Quality Control

Our Antioxidant HP-136 is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for assay and purity, to ensure it meets precise specifications for industrial and polymer-grade applications. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and physical parameters is provided with each shipment to guarantee consistency and performance.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.5 %
Melting Point	155 - 160 °C
Loss on Drying	≤ 0.5 %
Ash Content	≤ 0.1 %

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