N,N-Dimethylformamide (DMF) 99.90%: Solvent for Polymer and Electronics Manufacturing

Basic information

Item	Value
Product name	N,N-Dimethylformamide
Synonyms	DMF; N,N-dimethylmethanamide; formic acid dimethylamide; dimethylformamide
CAS number	68-12-2
Molecular formula	C3H7NO
Molecular weight	73.09 g/mol
Appearance	Colorless, clear liquid; faint amine-like odour
Assay / purity	99.90% typical commercial grade
Solubility	Miscible with water, alcohols, ketones, esters, ethers, chlorinated solvents
Packaging	190 kg/drum; other packaging on request
HS code	2924.19 (typical commercial classification)
Storage	Cool, dry, well-ventilated area; keep containers tightly closed; away from ignition sources; nitrogen blanket recommended
Main uses	Solvent for polymers, coatings, spinning, pharmaceuticals, electronics, agrochemicals, reaction medium

1. Overview

N,N-Dimethylformamide (DMF), CAS 68-12-2, is a dipolar aprotic solvent with a high polarity and exceptional solvency for a broad range of organic and inorganic compounds. It is a colorless, high-boiling liquid that remains stable under normal industrial conditions and is miscible with water and most common organic solvents. The 99.90% assay grade described here is a standard commercial specification suitable for polymer processing, coatings, pharmaceutical synthesis, and electronics manufacturing.

DMF is valued because it dissolves polymers that resist other solvents, including polyacrylonitrile, polyurethane, polyimide precursors, and polyvinylidene fluoride. This makes it central to acrylic fibre spinning, carbon fibre production, high-performance coatings, and lithium-ion battery electrode fabrication. It also serves as a reaction medium for pharmaceutical intermediates, agrochemical actives, and specialty chemicals. Supplied in 190 kg drums, it is a workhorse solvent for continuous and batch processes where consistent purity and low moisture are critical.

2. Manufacturing and supply

DMF is produced industrially by the catalytic carbonylation of dimethylamine or by related routes that combine dimethylamine with carbon monoxide and methanol under controlled pressure and temperature. The crude product is purified by distillation to remove water, dimethylamine, and other by-products, yielding a 99.90% assay suitable for demanding applications. Commercial supply is typically in 190 kg drums, with options for ISO tanks and bulk road tankers for high-volume users. Material is tested for water content, color, and acidity to ensure batch-to-batch consistency.

3. How it works

• Dipolar aprotic character: DMF has a high dielectric constant and a significant dipole moment, allowing it to stabilise ionic species and polar transition states without donating protons. This accelerates many nucleophilic substitutions and coupling reactions.
• Hydrogen bonding acceptor: The carbonyl oxygen acts as a strong hydrogen bonding acceptor, solvating proton donors and disrupting self-association in polymers and resins. This improves dissolution of polar polymers and increases solution clarity.
• Broad solubility envelope: It dissolves both polar and moderately nonpolar substances, including salts, natural resins, synthetic polymers, and dyes. This reduces the need for solvent blends in coating and spinning formulations.
• High boiling point and low volatility: With a boiling point around 153 °C, DMF remains in the process longer than acetone or tetrahydrofuran, enabling high-temperature processing without rapid evaporation.
• Polymer swelling and dissolution: DMF penetrates polymer matrices, breaks interchain interactions, and forms homogeneous solutions. This is essential for polyacrylonitrile spinning, polyimide varnish preparation, and membrane casting.

4. Application areas in detail

4.1 Polyacrylonitrile and acrylic fibre spinning

DMF is the preferred solvent for dry-jet wet spinning of polyacrylonitrile (PAN) precursor fibres. In this process, PAN powder is dissolved in DMF to form a dope, which is extruded through spinnerets into a coagulation bath. The resulting fibres are washed, drawn, and heat-treated. Downstream products include carbon fibre for aerospace composites, wind turbine blades, automotive body panels, and sporting goods such as golf shafts and bicycle frames. Acrylic textile fibres for apparel, upholstery, and outdoor fabrics also rely on DMF-based spinning. The solvent's high boiling point allows stable dope preparation and uniform fibre diameter.

4.2 Polyurethane and coating systems

DMF dissolves polyurethane resins, thermoplastic polyurethanes (TPU), and polyurethane dispersions used in high-solids and solvent-borne coatings. It is used in synthetic leather production, where polyurethane is coated onto release paper or fabric to create breathable, durable surfaces for shoes, bags, and automotive interiors. In furniture and industrial lacquers, DMF improves flow and levelling, reducing surface defects. Other downstream products include protective films, textile coatings, and adhesives for flexible packaging. Formulators choose DMF when they need to dissolve high-molecular-weight polyurethane grades that are insoluble in esters or ketones.

4.3 Pharmaceuticals and agrochemicals

In pharmaceutical manufacturing, DMF serves as a reaction solvent for active pharmaceutical ingredient (API) synthesis, including peptide coupling, nucleoside chemistry, and heterocyclic ring formation. It is also used in the preparation of pharmaceutical intermediates for generic drugs, antivirals, and oncology therapies. In agrochemicals, DMF is a solvent for herbicide, insecticide, and fungicide synthesis, as well as a formulation aid for water-soluble concentrates. Its ability to dissolve salts and polar reagents under anhydrous conditions makes it valuable for moisture-sensitive reactions. Typical end uses include tablets, capsules, injectables, and crop protection sprays.

4.4 Electronics and precision cleaning

DMF is used in electronics manufacturing for photoresist stripping, cleaning of printed circuit boards (PCBs), and removal of flux residues. It effectively dissolves cured photoresists, polyimide residues, and organic contaminants without attacking copper or aluminium conductors. In display production, DMF aids in cleaning LCD and OLED panels during fabrication. Semiconductor fabs use it as a carrier solvent for specialty formulations and as a cleaning agent for wafer processing equipment. Downstream products include smartphones, televisions, solar panels, and automotive electronics. Its high purity grade minimises ionic contamination and particle defects.

4.5 Petrochemical and gas processing

DMF is an efficient absorbent for the recovery of acetylene, 1,3-butadiene, and aromatic hydrocarbons from cracked gas streams. In extractive distillation, DMF selectively dissolves unsaturated hydrocarbons, allowing separation of close-boiling components. This supports the production of synthetic rubber, nylon intermediates, and high-octane gasoline blends. Downstream products include tyres, engineering plastics, and industrial solvents. The solvent's thermal stability and low volatility reduce make-up rates and energy consumption in regeneration columns.

4.6 Adhesives, inks, membranes, and batteries

DMF is a key solvent for polyimide varnishes used in flexible printed circuits and insulating films. It is also used in the casting of polymeric membranes for water treatment, gas separation, and hemodialysis. In lithium-ion battery production, DMF dissolves polyvinylidene fluoride (PVDF) binder for electrode slurries, ensuring uniform coating on current collectors. Other applications include printing inks, adhesives for laminates, and dye carriers for textiles. These uses benefit from DMF's ability to form stable, high-solids solutions that dry uniformly.

5. Comparison with alternatives

Alternative	Key difference	Practical implication
N-Methyl-2-pyrrolidone (NMP)	Higher boiling point, stronger solvency for some polymers, but greater reproductive toxicity concerns	Regulatory pressure may favour DMF where performance allows; NMP often requires additional engineering controls
Dimethyl sulfoxide (DMSO)	Lower toxicity profile, high freezing point (18 °C), strong oxidant incompatibility	DMSO can solidify in cold plants and reacts with some reagents; DMF remains liquid and more chemically inert
Dimethylacetamide (DMAc)	Similar aprotic solvent, higher cost, comparable toxicity	DMAc may be chosen for high-temperature spinning but offers limited cost advantage over DMF
Acetonitrile	Lower polarity, more volatile, poor polymer solvency	Acetonitrile is unsuitable for PAN or polyurethane dope preparation; DMF provides higher loading capacity
Tetrahydrofuran (THF)	Lower boiling point, peroxide formation risk, less polar	THF requires stabilisation and has lower flash point; DMF is safer for high-temperature processes
Dichloromethane	Lower polarity, high volatility, chlorinated VOC	DCM is restricted in many regions; DMF offers better solvency for polar polymers and lower vapour pressure

DMF is the practical choice when high polymer loading, high boiling point, and broad solubility are required, provided that appropriate engineering controls are in place for its reprotoxic classification. For lower-toxicity routes, DMSO or NMP may be considered, but they introduce trade-offs in freezing point, cost, or regulatory status.

6. Handling, storage and compliance

Store DMF in a cool, dry, well-ventilated area away from ignition sources, oxidisers, and strong acids. Keep 190 kg drums tightly closed and consider a nitrogen blanket to prevent moisture pickup and discolouration. Use nitrile gloves, chemical splash goggles, and a respirator if ventilation is inadequate. DMF is classified as a flammable liquid with a flash point around 58 °C and as a reprotoxic substance; transport is typically under UN 2265, Class 3, Packing Group III (typical commercial classification). Follow local REACH, TSCA, and workplace exposure regulations. Dispose of waste through licensed incineration or solvent recovery.

FAQ

Q1. What is N,N-Dimethylformamide used for? DMF is a high-purity solvent for polyacrylonitrile spinning, polyurethane coatings, pharmaceutical synthesis, electronics cleaning, and petrochemical extraction. It dissolves polymers and polar compounds that are difficult to process with other solvents.

Q2. Is DMF miscible with water? Yes, DMF is fully miscible with water in all proportions. This property supports aqueous quenching, washing, and formulation steps, but it also means that drying and distillation are required to recover anhydrous solvent.

Q3. What is the assay and packaging of this product? The typical assay is 99.90%, supplied in 190 kg drums. Other packaging such as ISO tanks or bulk tankers may be available depending on order volume and logistics.

Q4. How should DMF be stored? Store in a cool, dry, well-ventilated area away from heat, sparks, and oxidisers. Keep containers closed, use a nitrogen blanket if possible, and protect from moisture to maintain purity and colour.

Q5. What PPE is required when handling DMF? Use chemical-resistant gloves such as nitrile, splash goggles, and a lab coat or chemical suit. If ventilation is insufficient or mist may form, wear a respirator with organic vapour cartridges.

Q6. What are the alternatives to DMF for polyurethane coatings? N-Methyl-2-pyrrolidone (NMP), dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO) are common alternatives. Each has different toxicity, freezing point, and solvency characteristics, so selection depends on polymer type and regulatory constraints.

Q7. Is DMF classified as hazardous for transport? Yes, DMF is typically classified as a flammable liquid, UN 2265, Class 3, Packing Group III. It also carries reproductive toxicity warnings, so proper documentation and handling are required.

Q8. Can DMF be used in pharmaceutical manufacturing? Yes, DMF is widely used as a reaction solvent for API synthesis and intermediate preparation. Residual solvent limits in final drug products must comply with pharmacopoeial and regulatory guidelines.