Thermal grease is a specially formulated thermal grease with high thermal conductivity and low construction resistance between the metal heat sink and the heater. Testing items Testing standard Temp.WT5932-30D WT5932-30P Appearance Visual 25 Grey Grey Thermal conductivity(W/M·K) ASTM D5470 NA 3.5±0.1 3.0±0.1 Density (g/cc) ASTM D1475 25 2.35~2.45 3.0~3.1 Evaporation(%) Fed.Std.79 200/ 24Hours