Method 104 is the Immersion test to determine the effectiveness of the seal of component parts. The immersion of the part into liquid at widely different temperatures subjects it to thermal and mechanical stresses which readily detect a defective terminal assembly, or a partially closed seam or molded enclosure.
Defects of these types can result from faulty construction or from mechanical damage such as might be produced during physical or environmental tests. The immersion test is generally performed immediately following such tests because it will tend to aggravate any incipient defects in seals, seams, and bushings.
This test is essentially a laboratory test condition, and the procedure is intended only as a measurement of seal effectiveness.