Melted glasses find practical uses in a wide variety of hot industrial processes. Once work has cooled, a safe and dependable process is needed to thoroughly remove the solidified glass without damage to the substrate.
Often, the molten glass is used for its lubricating characteristics when hot forming, forging, or swaging metals (the “Sejeune” process). Upon cooling, the glass solidifies and presents a complex mixture of glass and metallic scales. While blasting may remove some of the glass, complex components may be damaged if the blasting is too severe.
Kastech® Ultra molten salt is utilized for glass removal applications such as cleaning metal molds of glasses, reclaiming hermetic glass seals, dissolving glass or quartz tubing from castings, and removing solidified glass from spinnerettes and tooling used to produce glass fibers.
Kolene® DGS® molten salt provides an optimum medium for rapidly dissolving solidified glass and simultaneously conditioning metallic oxides. For example, the molten salt formulation can be modified to also convert metallic oxide scales. This produces a uniformly reactive surface on the parts which allows subsequent cleaning operations such as pickling to be performed without base metal attack.
A related application for molten salt cleaning is using Kolene® Kastech® Ultra (formerly known as Denamel™) to dissolve porcelain enamel coatings. Applied as a finely ground powder which is then fired to form an adherent film, porcelain coatings are used for both decorative and functional purposes. Molten salt quickly removes fired porcelain enamel from poorly coated items or parts, as well as hooks and other tooling that receive multiple layers of the enamel.