What Is DMF (Dimethylformamide)?
Uses, Physical Properties & Why It Matters in Industry
📋 Table of Contents
- What Is DMF? - Definition & Chemical Identity
- Key Physical & Chemical Properties
- Why DMF Is a Polar Aprotic Solvent
- Major Industrial Applications
- DMF in Coatings, Inks & Adhesives
- DMF in Pharmaceuticals & Organic Synthesis
- Safety Overview & Handling Notes
- DMF Grades, Purity & Sourcing
- Frequently Asked Questions
- Request a Quote from Sinolook Chemical
1 ⚗️ What Is DMF? - Definition & Chemical Identity
DMF, or N,N-Dimethylformamide, is an organic compound with the molecular formula C₃H₇NO and CAS number 68-12-2. It is a colorless, water-miscible liquid with a faint amine-like odor, produced industrially by reacting dimethylamine with carbon monoxide under pressure.
The name "dimethylformamide" reflects its chemical lineage: it is the dimethyl derivative of formamide (the simplest amide). The abbreviation DMF is universally accepted in chemical, industrial, and regulatory contexts, though "DMF" is also used in pharmaceutical circles to mean "Drug Master File" - an entirely separate concept.
🔬 Chemical Identity at a Glance
| Property | Value |
|---|---|
| IUPAC Name | N,N-Dimethylformamide |
| Common Abbreviation | DMF |
| Molecular Formula | C₃H₇NO |
| Molecular Weight | 73.09 g/mol |
| CAS Number | 68-12-2 |
| Appearance | Colorless to pale yellow liquid |
| Odor | Faint amine / fishy smell |
2 📊 Key Physical & Chemical Properties
Understanding DMF's physical properties is essential for selecting the right grade and designing safe, efficient processes. The values below represent typical industrial-grade specifications.
| Property | Value | Significance |
|---|---|---|
| Boiling Point | 153 °C (307 °F) | High BP enables high-temperature reactions; easier distillative removal than low-BP solvents |
| Melting Point | −61 °C (−78 °F) | Remains liquid across a very wide temperature range |
| Density | 0.944 g/mL (25 °C) | Slightly lighter than water; relevant for tank storage and pump sizing |
| Flash Point | 58 °C (136 °F) | Flammable liquid (UN 2265); requires proper storage away from ignition sources |
| Vapor Pressure | 3.7 mmHg (25 °C) | Low volatility limits airborne exposure but requires ventilation in enclosed spaces |
| Viscosity | 0.92 cP (25 °C) | Low viscosity improves wetting and flow properties in coating applications |
| Dielectric Constant | 37.1 (25 °C) | High polarity; excellent for dissolving salts and ionic compounds |
| Water Miscibility | Fully miscible | Blends freely with water and most organic solvents; simplifies formulation |
| Refractive Index | 1.4305 (20 °C) | Used for QC purity verification |
💡 Formulator's Note: DMF's combination of high boiling point, low viscosity, and complete water miscibility makes it uniquely suited to processes that require both high-temperature stability and easy aqueous washout - for example, wet-process polyurethane film casting.
3 🔬 Why DMF Is a Polar Aprotic Solvent - And Why That Matters
Solvents are broadly classified as protic (containing an O–H or N–H bond, capable of hydrogen bond donation) or aprotic (lacking such a bond). DMF is firmly in the polar aprotic category, which has profound implications for its behavior in reactions and formulations.
What makes DMF aprotic?
The carbonyl group (C=O) in DMF creates a strong permanent dipole, giving it high polarity (dielectric constant ≈ 37). However, there is no acidic N–H or O–H proton: the nitrogen bears two methyl groups. DMF can accept hydrogen bonds (via the carbonyl oxygen) but cannot donate them.
Practical consequences
✅ What DMF does well
- Stabilizes carbanionic intermediates (SN2 reactions)
- Dissolves polar polymers: polyurethane, polyacrylonitrile, nylon
- Solvates cations strongly, leaving anions "naked" and reactive
- Enables reactions of inorganic salts (e.g. KCN, NaN₃) in organic media
⚠️ Limitations
- Not suitable where protic environment is needed
- Forms azeotrope with water - removal requires vacuum distillation or molecular sieves
- Hydrolyzes slowly to dimethylamine + formic acid under strong acid/base conditions
✅ Compared to DMSO: Both are polar aprotic, but DMF has a lower boiling point (153 °C vs 189 °C) and lower viscosity, making it easier to remove by distillation. DMSO is generally considered less toxic. DMF is preferred where higher dissolving power for resins and lower viscosity in solution are required.
4 🏭 Major Industrial Applications of DMF
DMF is a versatile "workhorse" solvent deployed across at least a dozen distinct industries. The table below summarizes the primary application sectors.
| Industry / Sector | Primary DMF Function | Typical Products Made |
|---|---|---|
| 🖌️ Coatings & Inks | Resin dissolution, viscosity control | Industrial coatings, gravure inks, wire enamels |
| 👗 Synthetic Fibers & Textiles | Spinning dope solvent for wet/dry-jet spinning | Polyacrylonitrile (acrylic) fibers, carbon fiber precursor |
| 🧴 Polyurethane & Leather | PU dissolution & wet coagulation | Synthetic leather (PU leather), microfiber fabric |
| 💊 Pharmaceuticals | Reaction solvent, crystallization medium | Active pharmaceutical ingredients (APIs), fine chemicals |
| 🧪 Organic Synthesis | Reaction solvent (SN2, Wittig, Heck, peptide synthesis) | Specialty chemicals, agrochemicals, dyes |
| 🔋 Electronics & Batteries | Electrode slurry casting (PVDF binder) | Li-ion battery electrodes, capacitor films |
| 🌀 Membranes & Nanofibers | Electrospinning solvent, phase inversion | Filtration membranes, PVDF nanofiber mats |
| 🧲 Adhesives & Sealants | Tackifier dissolution, formulation solvent | Structural adhesives, laminating adhesives |
5 🖌️ DMF in Coatings, Inks & Adhesives
The coatings and inks industry is one of the largest consumers of DMF globally. Its combination of strong dissolving power, low viscosity, and controlled evaporation rate makes it a preferred choice for formulators working with high-performance resin systems.
Why formulators choose DMF for coatings
- ✅ Outstanding resin compatibility: dissolves PU resins, acrylic polymers, vinyl resins, epoxy systems, and polyimide precursors
- ✅ Controlled drying: moderate evaporation rate prevents blushing and pinholes in film formation
- ✅ Leveling performance: low surface tension promotes smooth, defect-free films
- ✅ High-solids capability: allows formulating at higher solids content versus slower, more viscous solvents
Typical end-products using DMF-based coatings
Industrial Protective Coatings
Steel structures, pipelines
Gravure & Flexo Inks
Flexible packaging, labels
Magnet Wire Enamels
Motors, transformers
6 💊 DMF in Pharmaceuticals & Organic Synthesis
DMF is classified as a Class 2 residual solvent under ICH Q3C guidelines, meaning it may be used in pharmaceutical manufacturing but residual levels in finished drug products must not exceed 8.8 mg/day (concentration limit: 880 ppm). This places DMF in widespread use as a reaction solvent for APIs while demanding strict purification controls.
Key roles in organic synthesis
- 🧪 SN2 reaction solvent: enhances nucleophile reactivity by desolvating anions
- 🧪 Peptide coupling: standard solvent in solid-phase peptide synthesis (SPPS)
- 🧪 Pd-catalyzed reactions: Heck, Suzuki and Buchwald-Hartwig couplings
- 🧪 DMF-DMA reagent: DMF dimethyl acetal acts as a versatile C1 building block in heterocycle synthesis
- 🧪 Vilsmeier-Haack formylation: DMF + POCl₃ generates an electrophilic formylating agent for aromatic systems
💡 Pharmaceutical buyers: Sinolook Chemical supplies pharmaceutical-grade DMF meeting USP, EP and ICH Q3C residual solvent specifications. Certificate of Analysis (COA) and Safety Data Sheet (SDS) available on request.
7 ⚠️ Safety Overview & Handling Notes
⚠️ Important Safety Notice
DMF is a reproductive toxin (Category 1B) under GHS classification. It is readily absorbed through skin and inhalation. Chronic exposure is associated with liver toxicity and has been classified as a Substance of Very High Concern (SVHC) under REACH. Always work in a well-ventilated area and use appropriate PPE.
Exposure Limits
| Standard | Limit | Type |
|---|---|---|
| OSHA PEL | 10 ppm (TWA) | 8-hour time-weighted average |
| ACGIH TLV | 5 ppm (TWA) - skin notation | Skin absorption route is significant |
| EU OEL (REACH) | SVHC - Authorization required | Use subject to authorization from 2023 |
| ICH Q3C (Pharma) | 880 ppm / 8.8 mg/day | Residual solvent limit in finished drug products |
Essential PPE & Handling Checklist
🧤 Personal Protection
- Chemical-resistant gloves (butyl rubber preferred)
- Safety goggles / face shield
- Lab coat or chemical suit
- Respiratory protection if ventilation is inadequate
🏭 Engineering Controls
- Local exhaust ventilation (LEV) at point of use
- Store in cool, dry area away from oxidizers
- Use grounded metal containers to prevent static
- Equip storage areas with spill containment bunds
8 📦 DMF Grades, Purity & Sourcing
Not all DMF is equal. The grade you source must match your process requirements - particularly regarding water content, purity, and documentation. Below is a summary of the main commercial grades.
| Grade | Typical Purity | Water Content | Recommended For |
|---|---|---|---|
| Industrial Grade | ≥ 99.5% | ≤ 0.05% | Coatings, inks, adhesives, PU leather |
| Pharmaceutical Grade (USP/EP) | ≥ 99.9% | ≤ 0.02% | API synthesis, drug formulation |
| Anhydrous Grade | ≥ 99.8% | ≤ 50 ppm (dried over mol. sieves) | Moisture-sensitive reactions (organolithium, Grignard) |
| HPLC / GC Grade | ≥ 99.9% (UV grade) | Ultra-low | LC-MS mobile phase, spectroscopic applications |
✅ Sinolook Chemical supplies industrial-grade and pharmaceutical-grade DMF in 200L drums, IBC totes (1000L), and ISO tank containers. All shipments include full documentation: COA, SDS, MSDS, and packing list.
9 ❓ Frequently Asked Questions About DMF
Q1 · What does DMF stand for in chemistry?
In chemistry, DMF stands for N,N-Dimethylformamide - a polar aprotic organic solvent with CAS number 68-12-2. In pharmaceutical regulatory contexts, "DMF" can also mean Drug Master File, which is a completely separate document. Always confirm context when ordering.
Q2 · Is DMF the same as DMSO?
No. DMF (dimethylformamide) and DMSO (dimethyl sulfoxide) are both polar aprotic solvents, but they are different compounds. DMF (bp 153 °C) has higher dissolving power for resins and lower viscosity in solution; DMSO (bp 189 °C) is generally regarded as less toxic and is preferred in biological applications. The two are not interchangeable without reformulation.
Q3 · Is DMF toxic?
Yes - DMF is a reproductive toxin (Category 1B) under GHS classification and is hepatotoxic. It is readily absorbed through skin contact. Operators must use appropriate PPE and work in well-ventilated areas or under LEV. Under EU REACH regulations, DMF is listed as an SVHC and its use in the EU requires formal authorization.
Q4 · What is the boiling point of DMF?
DMF boils at 153 °C (307 °F) at standard atmospheric pressure. Its relatively high boiling point allows it to be used as a solvent in reactions that require elevated temperatures, and it can be removed from products by vacuum distillation to minimize thermal stress on heat-sensitive substrates.
Q5 · Is DMF banned in Europe?
DMF is not outright banned in the EU, but it has been designated an SVHC (Substance of Very High Concern) under REACH and is on the Authorization List (Annex XIV). Companies wishing to continue using DMF in certain applications in the EU must obtain authorization from ECHA. Some downstream applications - such as DMF residues in finished consumer articles (clothing, bags) - face strict restriction.
Q6 · What packing sizes is DMF available in?
Industrial DMF is typically packed in 200L steel drums, 1000L IBC totes, or ISO tank containers for bulk orders. Sinolook Chemical can accommodate custom packing requirements. Contact our team to discuss your volume needs and export documentation.
📚 Related Articles & Resources
🌐 Ready to Source DMF for Your Business?
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