The results of spontaneous ignition temperature tests conducted on JP-4 and seven hydraulic fluids in air while in contact with seven surfaces found in aircraft are presented. Tests were conducted at reduced and elevated pressures using both low and high velocity injection techniques. They were conducted by members of the Branch of Gas Explosions, Division of Explosives Technology, U. S. Bureau of Mines between 1 November 1956 and 31 October 1957. Hydraulic fluids Esso Univis J-43 (Spec. MIL-O-5606), MLO 53-446 (General Electric GS 61406), MLO 54-540 (Monsanto OS 45), MLO 54-581, MLO 54-645 (85％ Oronite 8200 + 15％ Plexol), MLO 54-856 (Hollings-head 72073C) and MLO 8200 (Oronite 8200) were tested while in contact with heated aluminum, beryllium-copper, copper, magnesium, pyrex glass, stainless steel and titanium surfaces. In addition, the flash and fire points of these fluids were determined in a standard ASTM apparatus.
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