LST Heavy Liquid solids contain heteropolytungstates in the form of extremely soluble, colourless, hydrated crystals. Concentrated aqueous solutions of LST Heavy Liquid form colourless or pale yellow heavy liquids. LST Heavy Liquid is normally used as an aqueous solution. However, the LST Heavy Liquid crystals are also highly soluble in acetone and alcohols, and can form dense liquids in these organic solvents. These provide a range of methods for the use and recycling of LST heavy liquids.

Solutions of LST Heavy Liquid have been found to be stable up to 140ºC for at least two weeks. No decomposition, or loss of maximum density was observed during this time. This means that solutions of LST which have been diluted by washing etc. can easily be reconcentrated by heating to boiling when evaporating off excess water.

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