Hindered Phenol Antioxidant for Lubricants

Name: Hindered Phenol Antioxidant for Lubricants
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 68411-46-1

Hindered phenol antioxidants are radical chain-terminating antioxidants that donate hydrogen atoms to peroxyl radicals, interrupting the autoxidation cycle and dramatically extending lubricant service life. Compounds in this class, including 2,6-di-tert-butyl-4-methylphenol (BHT) and high-MW polymeric hindered phenols, are used across engine oils, hydraulic fluids, and turbine oils. They synergize strongly with aminic antioxidants to provide balanced primary antioxidation at all severity levels.

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Technical Specifications

appearance	White to off-white powder or pale yellow liquid
flash point	>150 °C
molecular weight	220–1200 Da (grade dependent)
active ingredient content	≥98.0 wt%
solubility in mineral oil	Fully soluble at treat rates
melting point (solid grades)	55–75 °C

Applications

Engine oil antioxidant packages (PCMO and HDEO)
Hydraulic and turbine oils with extended drain life requirements
Gear oils and compressor lubricants subjected to high operating temperatures
Transformer and electrical insulating oils
Biodegradable and synthetic ester-based lubricants

Key Features

Primary antioxidant: terminates peroxyl radical chains to prevent oxidative lubricant degradation
Strong synergy with alkylated diphenylamine (ADPA) for comprehensive oxidation protection
Multiple molecular weight grades available to balance volatility, solubility, and performance
Effective across a wide treat rate range (0.1–2.0%) for cost-optimized formulation flexibility