Section 8.4 of ASTM B298 covers the continuity of coating test for silver-coated soft or annealed copper wire. This test verifies that the silver coating is continuous without bare spots or discontinuities.
The silver coating classes range from Class A (minimum 1.25% by weight) to Class E (minimum 10.00% by weight). The continuity test ensures complete coverage regardless of the coating class specified.
Continuous silver coating is essential for wire used in electrical equipment to prevent copper oxidation, ensure consistent solderability, and maintain reliable electrical connections throughout the wire’s service life.