Diethylene Glycol (DEG) — Industrial Grade DEG from China

Diethylene glycol comes out of the ethylene oxide hydration chain. When ethylene oxide reacts with water to make monoethylene glycol, a portion of the MEG reacts further with additional ethylene oxide to form the diethylene homolog, with triethylene glycol appearing as the next fraction in the series. Producers separate the three glycols by vacuum distillation, and the cut points in that distillation column determine the residual MEG and TEG content that shows up on the certificate of analysis.

The grade BASTONE distributes carries MEG at ≤0.15 wt.% and TEG at ≤0.40 wt.%, with a distillation range of 242–250°C and density at 20°C of 1.1155–1.1176 g/cm³. Color runs ≤15 Pt-Co and water content stays at ≤0.1 wt.%. Iron content is held to ≤0.0001 wt.% (as Fe) and acidity to ≤0.01 wt.% expressed as acetic acid.

Those numbers matter in different ways depending on where the material lands. In unsaturated polyester resin production, the acidity limit protects the acid value calculation during esterification — free acid entering with the glycol shifts the stoichiometry and the endpoint. The iron limit matters even more in polyester and polyurethane work, because trace iron catalyzes oxidative discoloration during the high-temperature esterification stage and shows up as yellowing in the finished resin. A ≤15 Pt-Co starting color gives formulators headroom for clear and light-tinted systems.

Water content drives isocyanate work directly. Any water present in a polyol blend consumes NCO groups and generates CO₂, which means foam density and hard-segment ratio both drift. Holding water at ≤0.1 wt.% keeps the correction manageable. The tight distillation range and narrow MEG/TEG window give formulators consistent equivalent weight batch to batch — relevant anywhere DEG is charged by weight against a fixed hydroxyl target.

BASTONE holds listed distributor status with SINOPEC and trades petrochemicals from China's top three producers. Direct producer allocation, rather than spot-market resale, is what keeps the pricing structure competitive — buyers get factory-direct pricing without the margin stack of intermediate trading layers. Every shipment carries a COA traceable to the producing plant and batch number. BASTONE distributes DEG; it does not manufacture it.