Method 215 is the Resistance to Solvents test with two purposes: (a) to verify that markings or color coding will not become illegible or discolored on parts when subjected to solvents normally used to clean solder flux, fingerprints, and other contaminants from printed-wiring and terminal-board assemblies; and (b) to verify that component protective coating, encapsulation material and sleeve material resistance are not degraded to the point where electrical or mechanical integrity is disturbed.
The test uses specified solvent formulations considered typical of those used in electronics manufacturing. Parts are immersed and/or brushed with the solvents and then examined for legibility and physical damage.
This test is essential for ensuring that military electronic components maintain their identification markings and structural integrity through the manufacturing and maintenance cleaning processes.