Stack Guard

(Water-Glycol fluid for testing and preservation of offshore hydraulic equipment)


Stack Guard is a ready-to-use, preservation fluid recommended for the internal protection of wellhead control stacks, motion compensation and other hydraulic equipment that, after periods of storage, will be commissioned to operate with water based hydraulic fluids. Stack Guard incorporates corrosion inhibitors to provide both liquid phase and vapour phase corrosion inhibition, effectively preventing corrosion-taking place in and above the liquid level. This is important when pockets of air could be left in a system or hardware. Stack Guard also contains lubricity additives and can be used for FAT testing specifically of BOP control equipment.

Features / Benefits

  • Long-term protection against corrosion.
  • Vapour phase inhibition.
  • Long-term resistance to bacteria, yeast and fungus.
  • Excellent lubricity for Factory Acceptance Testing.
  • Sea water compatible.
  • Low temperature storage.
  • Low viscosity.
  • Compatible with water glycols, water-based subsea control fluids and BOP fluids.

Data (Typical Values)

AppearanceColourless, Transparent Liquid
Specific Gravity1.07
pH 9.0
Viscosity (cSt) @
40°C (104ºF)
20°C (68ºF)
4°C (39ºF)

Flash Point °CNone
Corrosion ASTM D665BPass (24hrs)
Corrosion ASTM D5534Pass (60 Days)

Health and Safety

Refer to SDS for proper handling and disposal. Please note that the SDS includes handling, health and disposal information which should be passed on to your employees, and to anyone else who comes in contact with our product. Other advice can also be acquired from your local Houghton representative.
NOTE: Read and understand all precautions on container labels before using this product.


HFC/RP – Dual Purpose Testing and Preservation


Subsea/Surface BOP

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