What type of contamination is introduced into a hydraulic system through an unintended breach?

Ingress contamination refers to the unwarranted entry of foreign materials into a hydraulic system, typically due to a breach or failure in the system's integrity, such as seals or gaskets. This type of contamination is significant because it can lead to severe operational issues, affecting the performance and longevity of hydraulic components.

When a breach occurs, it allows external contaminants like dirt, moisture, or debris to enter the system, which can interfere with the hydraulic fluid’s properties and the functioning of components. This is different from internally generated contamination, which arises from wear and tear within the system itself, or built-in contamination from manufacturing residues. Residual contamination pertains to leftover materials from previous maintenance or operations, which are not the result of an active breach. Understanding ingress contamination is essential for maintaining the reliability and safety of hydraulic systems.