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Monomethylamine (MMA)

CAS Number: 74‑89‑5

Synonyms:Monomethylamine 40 % solution; MMA 40%; Methylamine solution; Methanamine 40%

Chemical Formula: CH₃NH₂ in H₂O

Molecular Weight: 31.06 g/mol (monomer)

Product Introduction

A 40% w/w aqueous solution of the gaseous primary amine. Strongly basic, highly reactive, flammable, and used extensively as a building block in pesticides, solvents (e.g. NMP), pharmaceuticals, surfactants, and other specialty chemicals.

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Physical & Chemical Properties

Property	Value (≈40 % in H₂O)
Appearance	Clear, colorless liquid; fishy/ammonia-like odor
Density @ 20 °C	~0.90 g/mL
Boiling Point	~44 °C (at 1 atm)
Melting Point (pure MMA)	−38 °C (solution ~−10 °C)
Flash Point	~–14 °C (CC)
Autoignition Temperature	430 °C
pH	Strongly basic (unstabilized)

Applications

Intermediate for NMP, MMEA, MDEA, pesticides, pharmaceuticals
Building block in solvent and surfactant production; also used in explosives, refinery intermediates and triazine synthesis

Safety & Handling

Highly flammable and corrosive; gases heavier than air. H225, H302, H318, H331, H335 hazards. Use full PPE, handle under ventilation, store cool and protected from sunlight; containers are pressurized and require special handling.