Polymer quenchants ?? in Metallurgy and other enigmas Posted May 28, 2006 Polyethylene glycol will not work because it doesn't have the inverse solubility that other PolyAlkylene Glycol quenchants, or other types of polymer quenchants. Polymer quenchants are the result of some pretty intense type reactions - and a lot of the feedstocks are expensive. However, the in-tank costs of the commercial quenchants are substantially cheaper than oil. For instance, using a modern quenchant at about 10% (similar to a fast oil), the cost is less that a couple of dollars per gallon. This is less than half the cost of a commersial oil quenchant.