ROYCO HF-825 is a concentrated solution of methacrylate polymer in a synthetic diester based oil which provides lubricity and at the same time ,a “tacky” film. ROYCO HF-825 is used as an assembly aid to “stick – hold” parts together in multi-component mechanisms such as gearboxes, pumps, and engine accessories. ROYCO HF-825 is also used to “wet out” or lubricate O-rings prior to pressing them into cavities thus preventing chafing or tearing of the O-ring surface. Because HF-825 is commonly used as a viscosity index improver in many lubricating oils, there is no cause for compatibility concerns when used in contact.

ROYCO HF-825 is widely used in the aircraft industry for assembling complex mechanisms like gearboxes, pumps, and engine accessories. Its tacky nature makes it invaluable for holding parts together during assembly, ensuring accuracy and stability. Additionally, it effectively lubricates O-rings before installation, preventing damage and extending their lifespan.