Published 2026-07-15 · Updated 2026-07-15 · Demeto Technical Team
Melting point as a purity signal
Pure DMT melts at 140-141 °C with a narrow melting range. A visibly wider range or depressed onset usually indicates rising impurity levels and should trigger a cross-check of purity, acid value and ash on the batch COA.
Two delivery forms: solid and molten
Standard delivery is white crystalline flakes or granules (about 0.6-1.2 mm) in 25 kg or jumbo bags. Regional customers can take molten delivery above about 141 °C (molten density about 1.07 g/cm3), which removes on-site melting but requires insulated lines and tanks.
Flash point and the thermal safety window
DMT has a closed-cup flash point of about 146 °C and boils at about 288 °C at atmospheric pressure. Typical molten-handling windows sit between 145-180 °C; avoiding open flames and local overheating also prevents sublimate from blocking cold spots in the piping.
Solubility and what actually matters
DMT is insoluble in water, slightly soluble in cold ethanol and soluble in hot ethanol, ether and chloroform. In transesterification it reacts from the melt or in methanol systems, so moisture control (polyester grade at 0.02% max) deserves more attention than solubility itself.
Three checks before charging
Confirm the melting point and range on the batch COA, confirm the packaging is intact with no moisture caking, and confirm the melting and transfer temperature profile stays inside the set window. If all three pass, the charging step rarely causes trouble downstream.