Copper strip classification

The rating scale for the copper strip corrosion test: class 1 slight tarnish (1a, 1b), class 2 moderate tarnish (2a–2e), class 3 dark tarnish (3a, 3b) and class 4 corrosion (4a–4c), judged against standard colour plaques.

• Also: copper corrosion class
• Also: ASTM copper strip standards
• Also: 1a–4c