TM - Triethylene Glycol Monomethyl Ether — Frequently Asked Questions

Because it carries three ether oxygens and a hydroxyl on a single molecule, all of which hydrogen-bond readily with water. That high affinity for water is what makes it useful as a humectant and in dehydration systems, where the job is to attract and hold moisture rather than to avoid it, and it is why the material must be stored sealed if water content is specified.

Very little. It boils above 240 degrees Celsius and has an extremely low vapour pressure, so it contributes almost nothing to VOC and produces essentially no solvent odour. In practice it does not evaporate out of a system, which makes it a permanent component rather than a processing solvent.

Triethylene glycol and its ethers are used to strip water from natural gas streams. The glycol contacts the wet gas, absorbs water by hydrogen bonding, and is then regenerated by heating to drive the water off. High boiling point and thermal stability are essential, since the solvent is repeatedly heated and cooled through that cycle.

Yes. Its very low volatility means it stays in a polymer or coating rather than migrating out and evaporating, which is the primary requirement for a plasticiser. It also has a single free hydroxyl available for esterification or etherification, so it serves as a chemical intermediate for making larger plasticiser molecules.