Phenothiazine Radical Scavenger Antioxidant

Name: Phenothiazine Radical Scavenger Antioxidant
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 92-84-2

Phenothiazine is a potent radical-scavenging antioxidant containing both sulfur and nitrogen heteroatoms, providing synergistic primary antioxidation when used alongside conventional phenolic and aminic antioxidants. Its unique tricyclic structure allows it to donate electrons to radical species at much lower concentrations than standard antioxidants. Phenothiazine is particularly effective as a thermal stabilizer in high-temperature synthetic lubricants, ester-based fluids, and specialty lubricant formulations where conventional antioxidants reach their thermal limits.

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Technical Specifications

purity	≥98.5 wt%
appearance	Yellow to green-yellow crystalline solid
melting point	183–186 °C
sulfur content	15.8–16.2 wt%
molecular weight	199.3 Da
nitrogen content	6.9–7.1 wt%

Applications

High-temperature synthetic ester and PAO lubricants for aviation and industrial use
Specialty electrical and transformer oils requiring excellent oxidative stability
Thermal stabilizer in polyol ester hydraulic fluids for aircraft applications
Additive in compressor oils operating above 200°C discharge temperatures
Synergistic antioxidant component in premium engine oil and turbine oil packages

Key Features

Dual nitrogen-sulfur heteroatom structure delivers exceptionally potent radical-scavenging activity
Effective at very low concentrations (0.05–0.3%) making it a cost-efficient antioxidant option
Strong synergy with DPA and hindered phenol antioxidants for comprehensive oxidation protection
High melting point and low volatility ideal for very high temperature applications