Cleanliness in product finishing is critical for several reasons. For example, particulates generated in casting and machining processes must be effectively removed to prevent premature wear of sliding and rotating parts. Because of this, one of the final steps in component manufacture is the cleaning process. Washer systems can be quite effective at removal of particulate contaminants. However, performance of bonding, coating, and finishing operations are not dependent on particulate removal efficiency, but rather on the chemical cleanliness of the surface. These processes depend on being able to establish a strong and stable interface with the part surface, which requires establishing and controlling surface cleanliness on a molecular level. This trend toward high-performance adhesive bonding and coating is forcing a reevaluation of the performance of parts washers.

Primary Topics:
• The meaning of surface cleanliness which goes beyond particulates.
• Quantifying parts washers
• How to measure surface cleanliness
• Establishing strong interfaces that are ready for successful adhesion