Methacrylic Acid

Methacrylic Acid

CAS Number: 79‑41‑4

Synonyms: Methacrylic acid; 2‑Methyl‑2‑propenoic acid; α‑Methacrylic acid

Chemical Formula:C₄H₆O₂

Molecular Weight:86.09 g/mol

Product Introduction

A colorless, corrosive, moderately volatile liquid with an acrid odor. A key industrial monomer used to create methacrylate esters (e.g., PMMA) for plastics (Lucite/Plexiglas), adhesives, coatings, nail primers, and enteric pharmaceutical coatings.

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Physical & Chemical Properties

Property Value
Appearance Clear, colorless liquid
Odor Acrid, pungent
Density @ 20 °C ~1.015 g/mL
Melting Point ~14–16 °C
Boiling Point ~161–163 °C
Vapor Pressure @ 20 °C ~0.7–0.9 mm Hg
Solubility (water) ~9–10 g/100 mL @ 20–25 °C
Refractive Index (n₂₀ᴅ) ~1.431–1.433
Flash Point ~77 °C (170 °F)
pKₐ ~4.66

Applications

  • Monomer for polymethacrylates:Used widely in PMMA production (Lucite, Plexiglas).
  • Coatings & adhesives:Building block for resins and polymer coatings.
  • Pharmaceutical enteric coatings:Provides pH-triggered release.
  • Nail primers & cosmetics:Preps acrylic nails.

Safety & Handling

  • Corrosive (hazard H314); harmful by inhalation (H335/H332). OSHA & ACGIH/TLV ≤20 ppm TWA. Highly irritant; polymerization hazard; store cool, inhibit polymerization, use PPE & fume hood.

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