4,4'-Methylenebis(2,6-di-tert-butylphenol)
CAS 118-82-1
EC 204-279-1
Formula C29H44O2
MW 424.66 g/mol
Polymers & Resins Plastics & PolymersLubricants & MetalworkingRubber & TireCoatings, Adhesives, Sealants & Elastomers Antioxidant & Stabilizer
Description
4,4'-Methylenebis(2,6-di-tert-butylphenol) is a bisphenolic primary antioxidant sold under trade names including Binox M, Ethyl 702, Ionox 220, Ralox 02 S, and others. It carries no assigned E-code and is classified under HS code 29072990. The compound belongs to the hindered phenol antioxidant class.
In polymer stabilization, it interrupts free-radical chain oxidation by donating hydrogen atoms to peroxy radicals, protecting polyolefins and engineering plastics during high-temperature processing and service life. It is also incorporated into lubricant formulations to retard oxidative degradation of base oils, and into rubber compounds to suppress thermal and flex-cracking during vulcanization and end use.
The material is supplied as a solid and is subject to REACH registration requirements within the European Economic Area. Procurement teams should confirm grade specifications, purity certificates, and packaging formats directly with the supplier, as these vary by production batch and commercial agreement.
In polymer stabilization, it interrupts free-radical chain oxidation by donating hydrogen atoms to peroxy radicals, protecting polyolefins and engineering plastics during high-temperature processing and service life. It is also incorporated into lubricant formulations to retard oxidative degradation of base oils, and into rubber compounds to suppress thermal and flex-cracking during vulcanization and end use.
The material is supplied as a solid and is subject to REACH registration requirements within the European Economic Area. Procurement teams should confirm grade specifications, purity certificates, and packaging formats directly with the supplier, as these vary by production batch and commercial agreement.
Physical Properties
| Melting Point | 152.5-153 °C |
| Boiling Point | 289 °C40 mm Hg(lit.) |
| Density | 0.99 g/cm3 (20℃) |
| Flash Point | 289°C/40mm |
| Color | White |
| Form | solid |
| Water Solubility | 31.9ng/L at 20℃ |
| Vapor Pressure | 0Pa at 25℃ |
| Refractive Index | 1.4875 (estimate) |
| Log P | 8.9 at 25℃ |
Trade & Regulatory
| HS Code | 29072990 |
| WGK (Germany) | 1 |
Other Names
Binox MEthyl 702Ionox 220IONOX(R) 220RALOX(R) 02 SIONOX(R) 220 AHAntioxidant 702GALVINOXYL PRECURSOR
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Raw Materials
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