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Royco HF-825 Grease

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Overview

Royco® HF-825 is a concentrated solution of a methacrylate-polymer in synthetic diester based oil which provides lubricity, and at the same time, a “tacky” film. Royco® HF-825 is ashless so it will not cause deposits or coke formation in the oil, wetted sections of engines or hydraulic systems.

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.
   
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Features

  • Superior Lubricity: Provides excellent lubricity, ensuring smooth operation and reduced wear in mechanical assemblies.
  • Tacky Film: Forms a "tacky" film that helps parts stay in place during assembly, simplifying the process and improving precision.
  • Ashless Composition: Prevents deposits and coke formation, maintaining the cleanliness and efficiency of engines and hydraulic systems.
  • Versatile Application: Suitable for use in gearboxes, pumps, engine accessories, and for lubricating O-rings, enhancing component longevity and performance.

Specifications

  • Appearance: Liquid
  • Colour: Yellow
  • Flash point: 397 °F
  • Density: 0.912 g/cm3
  • Dynamic viscosity: 225 - 425 mPa.s
  • Kinematic viscosity: 329 mm2/s at 212 °F

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Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.