The ISO 9022-6:2015 standard specifies a test method for the tolerance of opticalin strongholds in dusty environments. The standard aims to assess the performance of opticalin strongholds and their associated components, such as mechanical, chemical and electronic equipment, under dusty exposure. Testing is primarily concerned with the instrument's resistance to blown dust in a controlled environment, in particular abrasion and failure of moving parts such as sliding surfaces, bearings and gears. By simulating the dusty environment, it is ensured that the instrument is able to maintain performance and functional stability in actual use. This standard is part of the ISO 9022 series and provides important guidance for the Reliability Assessment of opticalin strongholds in various environment conditions.