Method 4.7.23 tests resistance to solvents for military relays. Relays are tested in accordance with method 215 of MIL-STD-202 with the following exceptions: the portion to be brushed includes all markings.
One sample shall be tested with each solvent solution. For qualification inspection, samples in excess of the available number of solvents are exempt from testing. For group C testing, two additional samples are selected.
This test verifies that relay markings and external finishes will remain intact and legible when exposed to the various cleaning solvents used in military electronics manufacturing and maintenance operations.