1. IEC 721-3-0: 1984: Classification of environmental conditions
2. IEC 60068-2-42: 2003: Environmental testing – Part 2-42: Tests – Test Kc: Sulfur dioxide test for contacts and connections
3. IEC 60068-2-43: 2003: Environmental testing – Part 2-43: Tests – Test Kd: Hydrogen sulphide test for contacts and connections
4. IEC 60068-2-60: 2015: Environmental testing – Part 2-60: Tests – Test Ke: Flowing mixed gas corrosion test
5. DIN EN ISO 10062: Corrosion tests in artificial atmosphere at very low concentrations of polluting gas(es) (ISO 10062:2006)