What is the standard for particulate testing in lubricants?

The standard for particulate testing in lubricants is ISO 4407. This standard specifically addresses the methods for assessing the cleanliness of oils and fluids, focusing on the measurement of particulate contamination. It outlines a procedure for the combination of both sedimentation and filtration to quantify and analyze the size and quantity of contaminants in lubricants. This is critical for ensuring the performance and longevity of machinery, as excessive particulate contamination can lead to wear, damage, and eventual failure of components.

The other options relate to different standards: ISO 9001 pertains to quality management systems, ISO 14001 focuses on environmental management, and ISO 50001 is concerned with energy management systems. None of these standards specifically address the testing and cleanliness of lubricants. Therefore, ISO 4407 is the correct choice when it comes to particulate testing in lubricants, as it is directly relevant to maintaining fluid purity and protecting equipment performance.