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DA series of fluorinated liquid has excellent inertia, high density, low viscosity and low surface tension, excellent properties such as low dielectric constant; And has noncombustible, non-toxic, non-corrosive, volatile no residue and so on characteristics, widely used in electronic engineering GROSS LEAK LEAK, THERMAL SHOCK hot and cold impact test, insulation test, high temperature aging test, etc., as the engineering test liquid.