1.1 This method covers the determination of the temperature at which liquids and solids will spontaneously ignite. These materials must ignite without application of spark or flame in a high-pressure oxygen-enriched environment.

1.2 This method is intended for use at pressures of 2.1 to 20.7 MPa (300 to 3000 psi). The pressure used in the description of the method is 10.3 MPa (1500 psi). The method, as described, is for liquids or solids with ignition temperature in the range from 60 to 425°C (140 to 800°F).

1.3 This method is for high-pressure pure oxygen. The method may be used in atmospheres from 0.5 % to 100 % oxygen.

1.4 An apparatus suitable for these requirements is described. This method could be applied to higher pressures and materials of higher ignition temperature. If more severe requirements or other oxidizers than those described are desired, care must be taken in selecting an alternative safe apparatus capable of withstanding the conditions.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.