Solvent Propylene Glycol Monomethyl Ether Acetate

What is Propylene Glycol Monomethyl Ether Acetate?

Propylene Glycol Monomethyl Ether Acetate (commonly known as PMA) is a colorless liquid with a mild ether-like odor, medium volatility, and the chemical formula C₆H₁₂O₃.

PMA is highly effective in dissolving various resins, has limited solubility in water, and is widely used in coatings, printing inks, and as a replacement for Cellosolve Acetate (CAC) in many applications.

PMA Technical Specifications

• CAS Number: 108-65-6
• Molecular weight: 132.16 g/mol
• Density: 0.965-0.970 g/cm³
• Freezing point: -67°C
• Boiling point: 146°C
• Flash point: 42°C
• Water solubility: 198 g/L
• Vapor pressure: 0.5 kPa
• Viscosity: 1.1 cP

How is PMA Produced?

First, Propylene Glycol Monomethyl Ether (PM) is produced by reacting propylene oxide with methanol under catalytic conditions. Then, PM reacts with acetic acid to form PMA.

Reaction equation:
Propylene oxide + CH₃OH → CH₃OCH₂CHOHCH₃
(Methanol → Propylene glycol methyl ether)

Key Applications of PMA

1. Coatings

Due to its excellent solubility for various resins and dyes, PMA is widely used as a solvent, flow improver, and coalescing agent in coatings. It is particularly suitable for polyisocyanate-based paints.

2. Printing Inks

Used in silk screen printing inks, gravure printing inks, flexographic inks, and ballpoint pen pastes.

3. Other Applications

• Adhesives
• Household polishing oils
• Wood stains
• Dye solutions and color pastes for leather and textile printing/dyeing

4. PMA as a Solvent in Paints

• Epoxy floor coatings
• Automotive paints
• Epoxy marine paints
• High-grade Alkyd paints
• Final topcoats
• MA Epoxy Primer paints
• Acrylic water-based paints
• Decorative paints
• Colored PU paints

Storage & Environmental Considerations

PMA is typically supplied in 200 kg drums and should be stored in a dry, cool, and well-ventilated area. For transportation, it falls under Packing Group III, Hazard Class 3. It has a specific gravity of 0.965 and a flash point of 42°C (closed cup).

⚠ Flammability Warning:
Both liquid and vapor forms of PMA are highly flammable. Vapors can travel long distances and pose fire/explosion risks. Avoid direct sunlight and minimize exposure to heat sources, sparks, or open flames.

PMA remains stable under recommended storage conditions but is incompatible with strong acids and oxidizing agents.