PARA-METHOXYPHENOL (MEHQ)

Para-methoxyphenol (MEHQ) is a highly effective polymerization inhibitor widely used to stabilize acrylates, methacrylates, styrene, and other reactive monomers during storage and transport.
Para-methoxyphenol (MEHQ) acts as a strong radical scavenger, preventing unwanted thermal or oxidative polymerization.
Para-methoxyphenol (MEHQ) is valued for its efficiency at low concentrations, color stability, and compatibility with a wide range of monomers and resins.
Para-methoxyphenol (MEHQ) is also used as an antioxidant, intermediate in fine chemicals, stabilizer in cosmetic formulations, and reagent in pharmaceutical synthesis.

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

Synonyms: Para-methoxyphenol, MEHQ, p-Methoxyphenol, 4-Methoxyphenol, Hydroquinone Monomethyl Ether, 4-Hydroxyanisole, p-Anisyl Alcohol Oxidation Product, Monomethyl Ether of Hydroquinone, Methacrylate Polymerization Inhibitor MEHQ, Acrylate Stabilizer MEHQ, Para-methoxyphenol (MEHQ), p-Methoxyphenol, 4-Methoxyphenol, Hydroquinone Monomethyl Ether, MEHQ, Monomethyl Ether of Hydroquinone, p-Hydroxyanisole, 4-Hydroxyanisole, p-Methoxy Phenol, 4-Methoxy Phenol, p-Methoxyphenol Inhibitor Grade, MEHQ Polymerization Inhibitor, MEHQ Acrylic Stabilizer, MEHQ Monomer Stabilizer, MEHQ Vinyl Monomer Inhibitor, MEHQ Styrene Inhibitor, MEHQ MMA Inhibitor, MEHQ Butadiene Inhibitor, MEHQ Industrial Stabilizer, MEHQ Radical Scavenger, MEHQ Antioxidant, MEHQ UV Stabilizer Component, MEHQ Acrylate Inhibitor, MEHQ Methacrylate Stabilizer, Para-Methoxy Phenol, Para-Methoxy Phenolic Compound, Para-Hydroxyanisole, MEHQ Polymer Chemistry Additive, MEHQ Acrylic Monomer Protector, MEHQ Inhibited Monomer Additive, p-Methoxyphenol Technical Grade, p-Methoxyphenol Industrial Grade, p-Methoxyphenol High Purity, Pure Para-Methoxyphenol, Extra Pure Para-Methoxyphenol, p-Methoxyphenol Crystals, p-Methoxyphenol Powder, p-Methoxyphenol Flakes, Para-Methoxyphenol Fine Chemical, Para-Methoxyphenol Specialty Chemical, Para-Methoxyphenol Raw Material, Para-Methoxyphenol Inhibitor Agent, p-Methoxyphenol Polymerization Retarder, MEHQ Curing Inhibitor, MEHQ Processing Additive, MEHQ Functional Additive, para-Methyl Ether of Hydroquinone, p-Monomethyl Hydroquinone, p-Methoxylated Phenol, 4-Methoxy Hydroquinone Derivative, p-Anisidic Phenol (trade name), Methoxyphenol p-Isomer, p-Methoxy Aromatic Phenol, MEHQ Stabilizing Agent, MEHQ Chemical Inhibitor, p-Methoxyphenolic Antioxidant, Hydroxyanisole p-Isomer, MEHQ Monomer Protection Agent, MEHQ Acrylic Resin Stabilizer, MEHQ Vinyl Resin Stabilizer, Para-Methoxyphenol Technical Product, Para-Methoxyphenol Industrial Product, MEHQ Phenolic Stabilizer, MEHQ Anti-Oxidative Agent, MEHQ Inhibitor for Unsaturated Monomers, Para-Methoxyphenol Chemical Ingredient

APPLICATIONS

Para-methoxyphenol (MEHQ) is used as a polymerization inhibitor in acrylate monomers.
Para-methoxyphenol (MEHQ) prevents spontaneous polymerization during transport and storage.
Para-methoxyphenol (MEHQ) increases monomer shelf stability under heat or oxygen exposure.

Para-methoxyphenol (MEHQ) is applied in methacrylate systems such as MMA, EMA, and HEMA.
Para-methoxyphenol (MEHQ) enhances control over polymerization kinetics.
Para-methoxyphenol (MEHQ) helps maintain clarity and color of monomers.

Para-methoxyphenol (MEHQ) is used in resin and coating industries.
Para-methoxyphenol (MEHQ) reduces oxidative degradation in stored resins.
Para-methoxyphenol (MEHQ) improves final product quality and stability.

Para-methoxyphenol (MEHQ) is used in adhesives and sealants.
Para-methoxyphenol (MEHQ) stabilizes reactive ingredients during processing.
Para-methoxyphenol (MEHQ) enhances resistance to radical-induced deterioration.

Para-methoxyphenol (MEHQ) is used as an antioxidant in cosmetic formulations.
Para-methoxyphenol (MEHQ) inhibits oxidation of oils, emulsifiers, and active ingredients.
Para-methoxyphenol (MEHQ) extends product shelf life.

Para-methoxyphenol (MEHQ) is used as an intermediate in pharmaceuticals.
Para-methoxyphenol (MEHQ) participates in synthesis of drug precursors and biologically active compounds.
Para-methoxyphenol (MEHQ) provides phenolic functionality required for targeted reactions.

Para-methoxyphenol (MEHQ) is used in fragrances and flavor chemistry.
Para-methoxyphenol (MEHQ) serves as a precursor for anisole-based aromatic compounds.
Para-methoxyphenol (MEHQ) enables selective substitution reactions.

Para-methoxyphenol (MEHQ) is employed in dyes and UV absorber synthesis.
Para-methoxyphenol (MEHQ) contributes to chromophore construction.
Para-methoxyphenol (MEHQ) improves photostability of polymer systems.

Para-methoxyphenol (MEHQ) is used in analytical chemistry.
Para-methoxyphenol (MEHQ) acts as a radical quencher in oxidation studies.
Para-methoxyphenol (MEHQ) supports controlled laboratory reactions.

Para-methoxyphenol (MEHQ) is used in agrochemical intermediate synthesis.
Para-methoxyphenol (MEHQ) contributes to phenoxy-based herbicide precursors.
Para-methoxyphenol (MEHQ) improves formulation stability in stored concentrates.

Para-methoxyphenol (MEHQ) is used as a polymerization inhibitor.
Para-methoxyphenol (MEHQ) prevents premature polymerization of acrylates and methacrylates.
Para-methoxyphenol (MEHQ) stabilizes reactive monomer mixtures during storage and shipment.

Para-methoxyphenol (MEHQ) is used in styrene stabilization.
Para-methoxyphenol (MEHQ) prevents runaway polymerization in styrene tanks.
Para-methoxyphenol (MEHQ) maintains storage safety for vinyl monomers.

Para-methoxyphenol (MEHQ) is used as an antioxidant in industrial formulations.
Para-methoxyphenol (MEHQ) protects chemicals from oxidative degradation.
Para-methoxyphenol (MEHQ) extends shelf life of sensitive organic compounds.

Para-methoxyphenol (MEHQ) is used in UV-curable systems.
Para-methoxyphenol (MEHQ) prevents early gel formation under light exposure.
Para-methoxyphenol (MEHQ) improves curing consistency in UV-resins and inks.

Para-methoxyphenol (MEHQ) is applied in adhesive manufacturing.
Para-methoxyphenol (MEHQ) controls curing speed in acrylic pressure-sensitive adhesives.
Para-methoxyphenol (MEHQ) prevents viscosity drift in stored adhesive formulations.

Para-methoxyphenol (MEHQ) is used in epoxy resin stabilization.
Para-methoxyphenol (MEHQ) delays undesired crosslinking during storage.
Para-methoxyphenol (MEHQ) improves thermal stability of epoxy monomers.

Para-methoxyphenol (MEHQ) is used in rubber antioxidant systems.
Para-methoxyphenol (MEHQ) reduces oxidation of rubber processing intermediates.
Para-methoxyphenol (MEHQ) enhances long-term stability of elastomer chemicals.

Para-methoxyphenol (MEHQ) is used in perfume and fragrance chemistry.
Para-methoxyphenol (MEHQ) serves as a precursor for aromatic esters.
Para-methoxyphenol (MEHQ) contributes to sweet, floral aroma molecules.

Para-methoxyphenol (MEHQ) is used as a reagent in organic synthesis.
Para-methoxyphenol (MEHQ) is a building block for anisole derivatives.
Para-methoxyphenol (MEHQ) participates in oxidation and substitution reactions.

Para-methoxyphenol (MEHQ) is used in analytical laboratories.
Para-methoxyphenol (MEHQ) serves as a reference material for phenolic analysis.
Para-methoxyphenol (MEHQ) is used in redox chemistry studies.

Para-methoxyphenol (MEHQ) is used in coating and paint systems.
Para-methoxyphenol (MEHQ) stabilizes unsaturated resins in liquid coatings.
Para-methoxyphenol (MEHQ) prevents gel formation in alkyd and acrylic paints.

Para-methoxyphenol (MEHQ) is used in ink manufacturing.
Para-methoxyphenol (MEHQ) stabilizes monomers in UV inkjet formulations.
Para-methoxyphenol (MEHQ) maintains consistent flow and printability of inks.

Para-methoxyphenol (MEHQ) is used in medical device resin stabilization.
Para-methoxyphenol (MEHQ) keeps monomer syringes stable before polymerization.
Para-methoxyphenol (MEHQ) ensures controlled curing in dental and surgical resins.

Para-methoxyphenol (MEHQ) is used in polymer R&D laboratories.
Para-methoxyphenol (MEHQ) allows safe handling of reactive methacrylate systems.
Para-methoxyphenol (MEHQ) enables controlled kinetic studies in polymer science.

DESCRIPTION

Para-methoxyphenol (MEHQ) is a white to off-white crystalline solid with a mild phenolic odor.
Para-methoxyphenol (MEHQ) dissolves well in alcohols, ethers, and organic solvents.
Para-methoxyphenol (MEHQ) offers excellent storage stability under proper conditions.

Para-methoxyphenol (MEHQ) functions as a strong antioxidant and radical scavenger.
Para-methoxyphenol (MEHQ) neutralizes free radicals generated by heat, UV exposure, or oxidation.
Para-methoxyphenol (MEHQ) effectively inhibits unwanted polymerization at low doses.

Para-methoxyphenol (MEHQ) is compatible with various monomers, resins, and reactive chemicals.
Para-methoxyphenol (MEHQ) integrates seamlessly into industrial formulations.
Para-methoxyphenol (MEHQ) retains color stability during extended storage.

Para-methoxyphenol (MEHQ) exhibits strong thermal stability.
Para-methoxyphenol (MEHQ) resists discoloration and oxidation when stored away from light.
Para-methoxyphenol (MEHQ) may be combined with hydroquinone for synergistic effect.

Para-methoxyphenol (MEHQ) is available in technical and high-purity grades.
Para-methoxyphenol (MEHQ) is suitable for industrial, cosmetic, and laboratory uses.
Para-methoxyphenol (MEHQ) shows predictable and controlled behavior in chemical reactions.

PROPERTIES

Chemical Formula: C7H8O2
Molecular Weight: 124.14 g/mol
Appearance: White to off-white crystals
Odor: Mild phenolic odor
Melting Point: 54–56°C
Boiling Point: ~243°C
Solubility: Soluble in ethanol, ether, acetone, and organic solvents
Reactivity: Reacts readily with free radicals
Stability: Stable when protected from light and heat
Flash Point: ~121°C
pH: Slightly acidic (phenolic)

FIRST AID

Inhalation:
Move to fresh air immediately.
Seek medical help if respiratory irritation persists.

Skin Contact:
Wash thoroughly with soap and water.
Remove contaminated clothing.
Seek medical attention for persistent irritation.

Eye Contact:
Rinse with clean water for several minutes.
Seek medical care if symptoms do not improve.

Ingestion:
Rinse mouth with water.
Do not induce vomiting.
Seek medical assistance if discomfort appears.

Physician Note:
Treat symptomatically; phenolic compounds may cause irritation or sensitization.

HANDLING AND STORAGE

Handling:
Wear protective gloves, goggles, and lab clothing.
Avoid dust formation and inhalation.
Handle in well-ventilated areas.

Ventilation:
Use local exhaust ventilation for powders or during transfer.

Avoidance:
Avoid strong oxidizers, strong bases, and strong acids.
Avoid elevated temperatures and prolonged light exposure.

Spill Procedures:
Sweep up gently to avoid dust.
Dispose of collected material in approved waste containers.

Storage:
Store in a cool, dry, well-ventilated location.
Keep container tightly closed.
Protect from heat, light, and air exposure to maintain inhibitor activity.