A coolant,H1,is made from 95 wt.% of soft water,about 5 wt.% silicon oil together with ethanol and emulsifier like soda soap. The results of corrosivity test to steel,solvability and different compatibility tests with explosives,including chemical reaction test (CRT),vacuum stability test (VST) and microcalorimetry,indicate that this coolant can be safely used to machine explosive charges.