Diethylene Glycol Monomethyl Ether: Key Properties & FAQs

Diethylene glycol monomethyl ether is a hygroscopic, aromatic-odoured glycol ether solvent that is fully miscible with water and a wide range of common organic solvents, making it a versatile reagent for research and industrial applications.

CAS / SKU

SKU D1530156B (Aladdin Scientific)

Physical Appearance

Colourless liquid with aromatic odour

Hygroscopicity

Hygroscopic; absorbs moisture from the atmosphere

Miscibility

Fully miscible with water, ethanol, glycerol, diethyl ether, acetone, and dimethylacetamide

Oral LD₅₀ (rat)

9.21 g/kg (rat, oral)

Irritancy

Irritant to skin, eyes, and mucous membranes

What Is Diethylene Glycol Monomethyl Ether?

Diethylene glycol monomethyl ether (DGME) is a glycol ether solvent belonging to the ether-alcohol family. It is characterised by an aromatic odour and a colourless liquid appearance under standard conditions. Its chemical structure combines both ether and hydroxyl functional groups, giving it an exceptional ability to dissolve polar and moderately non-polar compounds alike. Aladdin Scientific supplies DGME under SKU D1530156B for research and industrial use.

Physical and Chemical Properties

DGME exhibits notable hygroscopicity, meaning it will absorb moisture from the surrounding atmosphere if left in an open container. This property must be considered when preparing anhydrous formulations. The solvent is fully miscible with water, ethanol, glycerol, diethyl ether, acetone, and dimethylacetamide, making it an excellent co-solvent and coupling agent in multi-component systems. Its broad miscibility profile also facilitates its use as a cleaning agent and reaction medium in synthetic chemistry.

Due to its hygroscopic nature, storage in tightly sealed containers away from humidity is strongly recommended. Users should verify water content by Karl Fischer titration if anhydrous conditions are critical to their application.

Safety and Handling Guidelines

DGME has a reported oral LD₅₀ of 9.21 g/kg in rats, indicating relatively low acute oral toxicity; however, it is classified as an irritant and should not be treated as benign. Direct contact with skin, eyes, or mucous membranes should be avoided. Appropriate personal protective equipment (PPE) — including chemical-resistant gloves, safety goggles, and a laboratory coat — must be worn when handling this compound.

Work should be conducted in a well-ventilated area or fume hood to minimise inhalation exposure. In the event of skin or eye contact, flush immediately with copious amounts of water and seek medical attention if irritation persists. Consult the full Safety Data Sheet (SDS) before use.

Common Laboratory Applications

Owing to its excellent miscibility with both aqueous and organic phases, DGME is widely used as a solvent in coatings, inks, and cleaning formulations, as well as a reaction medium in organic synthesis. In research settings, it serves as a co-solvent to improve solubility of poorly water-soluble compounds, and as a coupling solvent in formulation science. Its ability to mix with dimethylacetamide also makes it compatible with polymer processing applications.

Researchers should note that its hygroscopicity may affect moisture-sensitive reactions; pre-drying over molecular sieves or distillation under inert atmosphere may be required for demanding applications.

Storage and Stability Recommendations

Store diethylene glycol monomethyl ether in a tightly closed container in a cool, dry, and well-ventilated location, away from sources of ignition and incompatible materials such as strong oxidising agents. Because the compound is hygroscopic, exposure to ambient air should be minimised; consider using inert gas blankets (e.g., nitrogen or argon) when repeatedly accessing large containers.

Under proper storage conditions, DGME is expected to remain stable. However, always check the product's expiry date and conduct quality verification if the reagent has been stored for an extended period or if the container seal has been compromised.

Frequently asked questions

Is diethylene glycol monomethyl ether miscible with water?

Yes. Diethylene glycol monomethyl ether is fully miscible with water in all proportions. It is also miscible with ethanol, glycerol, diethyl ether, acetone, and dimethylacetamide, making it highly versatile as a co-solvent in aqueous and organic formulations.

How should diethylene glycol monomethyl ether be stored to prevent moisture absorption?

Because DGME is hygroscopic, it should be stored in a tightly sealed container in a cool, dry environment. For repeated-access containers, purging the headspace with dry inert gas such as nitrogen or argon is recommended. Karl Fischer titration can be used to verify water content before use in moisture-sensitive applications.

What is the acute toxicity of diethylene glycol monomethyl ether?

The oral LD₅₀ of diethylene glycol monomethyl ether in rats is reported as 9.21 g/kg, indicating relatively low acute oral toxicity. Nevertheless, the compound is an irritant and appropriate PPE — including gloves and eye protection — must be worn at all times during handling.

Can diethylene glycol monomethyl ether be used in moisture-sensitive reactions?

DGME can be used in such reactions only after thorough drying, as its hygroscopic nature means commercially supplied material may contain absorbed water. Pre-drying over activated molecular sieves or freshly activated alumina, followed by storage under inert atmosphere, is advisable before use in anhydrous synthetic procedures.

What personal protective equipment is required when handling DGME?

Users should wear chemical-resistant gloves, safety goggles or a face shield, and a laboratory coat when handling diethylene glycol monomethyl ether. Work should be performed in a well-ventilated area or under a fume hood to minimise inhalation risk. Always consult the product SDS for comprehensive hazard and first-aid information.

References

1. Aladdin Scientific. Diethylene glycol monomethyl ether, SKU D1530156B, product information and safety data.
2. OECD SIDS. Diethylene glycol monomethyl ether: oral LD50 (rat) 9.21 g/kg as reported in product documentation.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.