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4-methoxyphenol

CAS Number
150-76-5
EC Number
205-769-8
Chemical Formula
C7H8O2
Molecular Weight
124.14 g/mol

Description

4-Methoxyphenol (CAS 150-76-5 ), also known commercially as mequinol and 4-hydroxyanisole, functions as a polymerization inhibitor and antioxidant in industrial chemical processing. It prevents premature crosslinking and radical chain reactions in reactive monomer systems, protecting product integrity during storage and transport across various supply chains. In plastics and polymer manufacturing, it stabilizes vinyl and acrylic monomers against unwanted polymerization during bulk storage. Coatings and adhesive formulators use it to extend shelf life. It is particularly effective in UV-curable and reactive resin systems where premature gelation is a critical quality risk. As a pharmaceutical intermediate, mequinol is a direct active ingredient. It is used in topical depigmentation formulations and as a building block for synthesizing complex API structures. In personal care, it is incorporated into skin-lightening products. Regulatory-grade purity is a procurement requirement for these applications. 4-Methoxyphenol is supplied as a white to off-white crystalline solid or flake for industrial use. Technical grade is standard for industrial inhibitor applications, while pharmaceutical and cosmetic buyers typically source material meeting BP or USP specifications. Packaging ranges from kilogram-scale bags to bulk drum quantities depending on application volume. This ensures flexibility for both small-scale labs and large manufacturing plants. Contact us for supply of 4-methoxyphenol Request Quote

Other Names (Synonyms)

4-hydroxyanisole | 1-Hydroxy-4-methoxybenzene | Mequinol | p-hydroxyanisole | p-Guaiacol | Leucodine B | Leucobasal®

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point57 °C
Boiling Point243 °C @ Press: 760 Torr
Density1.55 g/cm³ @ Temp: 20 °C
Flash Point>230 °F
Appearance4-Methoxyphenol is a colorless to white, waxy solid with an odor of caramel and phenol. A combustible solid.
ColorClear colorless to pale yellow
Odorat 1.00?%?in?dipropylene glycol. phenolic
FormLiquid
Water Solubility40 g/L (25 ºC)
Vapor Pressure<0.01 mm Hg ( 20 °C)
Refractive Index1.5286 (estimate)
pH5.1 (30g/l, H2O, 20℃)
Log P1.3 at 20℃

Safety & Handling

Warning
GHS07· IrritantGHS08· Health Hazard

Hazard Statements

H302Harmful if swallowed
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H320Causes eye irritation
H351Suspected of causing cancer
H361Suspected of damaging fertility or the unborn child
H401Toxic to aquatic life
H315Causes skin irritation
H402Harmful to aquatic life
H412Harmful to aquatic life with long lasting effects

Trade & Regulatory

HS Code29095090
Storage Class11 - Combustible Solids
WGK (Germany)1