Description

3,7-Bis(1,1,3,3-Tetramethylbutyl)-10H-Phenothiazine is a high-purity, sterically hindered phenothiazine derivative, widely recognized for its exceptional performance as an antioxidant and stabilizer in demanding industrial applications. Its core value lies in its ability to effectively inhibit oxidative degradation and chain scission, thereby extending the service life and maintaining the properties of sensitive materials. This compound is essential for manufacturers in the polymer, lubricant, and specialty chemical industries who require reliable protection against thermal and oxidative stress.

Application

• Polymer Stabilizer: A highly effective antioxidant for polyolefins (e.g., PP, PE), engineering plastics, and synthetic rubbers to prevent thermal-oxidative degradation during processing and end-use.
• Lubricant & Fuel Additive: Used in formulating advanced lubricating oils, greases, and fuels to enhance oxidative stability, reduce sludge formation, and extend drain intervals.
• Chemical Intermediate: Serves as a key building block for synthesizing more complex phenothiazine-based antioxidants, pharmaceuticals, and dyes.
• Adhesive & Sealant Formulations: Imparts stability to polyurethane and other adhesive systems susceptible to degradation from heat and oxygen exposure.
• Photographic Chemicals: Acts as a stabilizer and anti-foggant agent in certain photographic developer solutions.
• Research & Development: Utilized in academic and industrial R&D for studying antioxidant mechanisms and developing new stabilized material systems.

Basic Information

Product Name	3,7-Bis(1,1,3,3-Tetramethylbutyl)-10H-Phenothiazine
CAS No.	10538-33-7
Molecular Formula	C28H41NS
Molecular Weight	423.70 g/mol
Synonyms	Phenothiazine, 3,7-bis(1,1,3,3-tetramethylbutyl)-; 3,7-Di-tert-octylphenothiazine; Bis(1,1,3,3-tetramethylbutyl)phenothiazine; Irganox 5057; Antioxidant 5057; Ethanox 736; AO-736; 10H-Phenothiazine, 3,7-bis(1,1,3,3-tetramethylbutyl)-; 3,7-Di(1,1,3,3-tetramethylbutyl)phenothiazine
EINECS	234-104-7

Quality Control

Our 3,7-Bis(1,1,3,3-Tetramethylbutyl)-10H-Phenothiazine is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for identity, purity, and performance. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at room temperature (15-25°C). Due to its sensitivity to oxidation, it is recommended to store under an inert atmosphere (e.g., nitrogen) for long-term preservation. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	White to light yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	95 - 100 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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