This MIL-I-25135 specification covers materials used in the liquid penetrant inspection of metal and nonporous, nonmetal parts for material discontinuities open to the surface. This specification is canceled. Superseded by SAE-AMS2644)
The MIL-PRF-25567 Type I & II covers two types of a gas leak detection compound that is compatible with oxygen. The leak detection compound is intended for use in detecting leaks in both high- and low-pressure oxygen systems in aircraft and other related oxygen systems.