Is DMF a Universal Solvent?
Strictly speaking, no solvent is universal, and DMF is no exception: it does not dissolve every substance. However, N,N-dimethylformamide (CAS 68-12-2) comes remarkably close for organic chemistry. DMF dissolves most organic compounds, including polymers, resins, dyes and pharmaceutical intermediates, as well as many inorganic salts, and it is fully miscible with water and with most common organic solvents such as alcohols, ethers, ketones and hydrocarbons. This broad solvency, combined with a low evaporation rate, makes DMF the preferred reaction and processing medium for a wide range of industrial and laboratory operations.
Key Properties
| Property | Value |
|---|---|
| Molecular formula | C3H7NO |
| CAS / EINECS | 68-12-2 / 200-679-5 |
| Boiling point | ≈153 °C |
| Melting point | ≈−61 °C |
| Density | ≈0.948 g/mL at 20 °C |
| Flash point (closed cup) | ≈58 °C |
| UN number | 2265 (class 3, packing group III) |
DMF is a colourless, hygroscopic liquid with a faint amine-like odour. Its relatively high flash point allows safer handling in controlled industrial environments than low-flash-point solvents, but it is still flammable and requires proper precautions.
Main Applications
Because of its excellent solvency, DMF is used across many industries:
Acrylic fibre production - as the spinning solvent for dry-spun acrylic fibres.
Synthetic leather - as the solvent in polyurethane wet-process coating of artificial leather.
Pharmaceuticals - as a solvent for reactions, crystallisation and peptide coupling.
Agrochemicals - in the development and manufacture of pesticides.
Adhesives, films and surface coatings - as a high-boiling formulating solvent.
Electronics - in photoresist strippers and cleaning formulations.
DMF as a Chemical Reagent
Beyond solvency, DMF participates in organic reactions. It is the formylating reagent in the Vilsmeier–Haack reaction, a standard route to aromatic aldehydes, and is used in the Bouveault aldehyde synthesis. These roles make DMF a dual-purpose workhorse in fine-chemical and pharmaceutical manufacturing.
Safety and Regulatory Notes
DMF requires careful handling. Under EU CLP it is classified as a reproductive toxicant, category 1B (H360D: may damage the unborn child), and it is listed as a Substance of Very High Concern (SVHC) under REACH, which triggers supply-chain communication duties. It is also harmful in contact with skin and if inhaled (H312, H332) and causes eye and respiratory irritation (H319, H335). Occupational exposure limits in many jurisdictions are set around 10 ppm TWA with a skin notation. Use effective ventilation or local exhaust, wear chemical-resistant gloves, protective clothing and eye protection, and follow the SDS. DMF is transported under UN 2265, class 3, packing group III.
Frequently Asked Questions
Is DMF a universal solvent? No solvent is truly universal. DMF is an exceptionally versatile aprotic polar solvent that dissolves most organic compounds and many salts, but it does not dissolve every substance.
What is DMF mainly used for? DMF is used as a process solvent in acrylic fibres, synthetic leather, pharmaceuticals, agrochemicals, adhesives, films, coatings and electronics applications, and as a reagent in formylation chemistry.
Is DMF miscible with water? Yes. DMF is fully miscible with water and with most common organic solvents in all proportions.
Why is DMF considered a reproductive hazard? Under EU CLP, DMF is classified as Repr. 1B (H360D) on the basis of animal and human evidence of developmental toxicity, and it is on the REACH SVHC candidate list.
What is the flash point of DMF? The closed-cup flash point of DMF is about 58 °C, higher than many low-boiling solvents but still within the flammable liquid classification.
What PPE is required when handling DMF? Use chemical-resistant gloves, protective clothing, eye protection and adequate ventilation or respiratory protection where vapour levels may exceed the occupational exposure limit.