Description

3,3',5,5'-Tetra(tert-Butyl)[1,1'-Biphenyl]-4,4'-Diol CAS NO 128-38-1 is a sterically hindered biphenol derivative, widely recognized as an effective antioxidant and polymerization inhibitor. Its primary value lies in its ability to scavenge free radicals and prevent oxidative degradation, thereby extending the service life and stability of sensitive materials. This high-performance additive is essential for manufacturers in the polymer, lubricant, and specialty chemical industries seeking to enhance product durability under demanding conditions.

Application

• Polymer Stabilizer: A key antioxidant and processing stabilizer for polyolefins (e.g., PP, PE), engineering plastics, and synthetic rubbers to prevent thermal and oxidative degradation during manufacturing and end-use.
• Lubricant & Fuel Additive: Used in formulations of engine oils, greases, and industrial lubricants to inhibit oxidation, reduce sludge formation, and extend oil change intervals.
• Inhibitor for Monomers: Prevents premature polymerization of vinyl monomers like styrene, acrylates, and other unsaturated compounds during storage and transportation.
• Intermediate for Advanced Materials: Serves as a crucial building block in the synthesis of high-performance polymers, liquid crystals, and other specialty organic compounds.
• Adhesive & Coating Formulations: Enhances the thermal and oxidative stability of adhesives, sealants, and protective coatings, preventing embrittlement and loss of performance.
• Elastomer Protection: Protects synthetic and natural rubber products from ozone and oxygen-induced cracking and aging.

Basic Information

Product Name	3,3',5,5'-Tetra(tert-Butyl)[1,1'-Biphenyl]-4,4'-Diol
CAS No.	128-38-1
Molecular Formula	C28H42O2
Molecular Weight	410.64 g/mol
Synonyms	4,4'-Biphenol, 3,3',5,5'-tetra-tert-butyl-; 2,6-Di-tert-butyl-4-(3,5-di-tert-butyl-4-hydroxyphenyl)phenol; Tetrakis(1,1-dimethylethyl)-4,4'-biphenyldiol; 3,3',5,5'-Tetrakis(tert-butyl)-4,4'-dihydroxybiphenyl; Biphenyl-4,4'-diol, 3,3',5,5'-tetra-tert-butyl-; Antioxidant 300; AO 300; TBBD
EINECS	204-881-4

Quality Control

Our production of 3,3',5,5'-Tetra(tert-Butyl)[1,1'-Biphenyl]-4,4'-Diol adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. Certificates of Analysis (COA) detailing all test results are provided and can be tailored to meet specific regulatory or internal quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This compound is easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	185 - 190 °C
Loss on Drying	≤ 0.5 %
Residue on Ignition	≤ 0.1 %

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