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 with the oil wetted areas of the lube system.