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MIL-PRF-85704 Guide

MIL-PRF-85704 is a military performance specification that relates to the requirements for aero engine cleaning compounds. This cleaning compound is intended for removing organic and inorganic soils, such as oils, grease, hydraulic fluids, exhaust carbon, and other contaminants from aircraft engine surfaces. These compounds are essential for maintaining the engine's performance and preventing the buildup of contaminants that can reduce efficiency and increase maintenance costs.

Versions

MIL-PRF-85704C Is the most recent version of the spec where MIL = Military, PRF = Performance Specification, 85704 = Unique identification number, C = Version.

MIL-PRF-85704B Revision B was established in November 1992, this was superceded by version C in July 1998.

MIL-PRF-85704A Was the earliest version of the spec, established in Apr 1986 with an amendment in March 1988 and again in August 1988

Types

The following types allow for a variety of cleaning methods depending on the nature of the contaminants and the type of aircraft surfaces being cleaned.

  • Type I: Used for off-line cleaning operations, where the engine is cranked but not running.
  • Type II: Also used for off-line cleaning.
  • Type III: Used for on-line cleaning, where the engine is running. 

    • Products that conform to MIL-PRF-85704

    ZOK 27 Compressor Cleaner Concentrate 25Lt Pail *MIL-PRF-85704C Type II
    ZOK 27 Compressor Cleaner Concentrate 25Lt Pail *MIL-PRF-85704C Type II
    Silmid P/N: 
    ZOK270025L
    On Order - 16 available in 27 days
    £258.71 excl VAT
    £310.45  inc VAT

    Key Requirements and Features

    • Corrosion Inhibition: The cleaning compounds must not contribute to corrosion of the materials used in the construction of military aircraft.
    • Material Compatibility: The compounds must be compatible with a wide range of materials used in turbine engine construction, such as metals, coatings, and seals.
    • Effectiveness: The compounds must be effective in removing various types of contaminants, including carbon deposits, oil, and other substances that can accumulate in turbine engine gas paths.
    • Non-toxic and Environmental Considerations: Depending on the type, MIL-PRF-85704 compounds are designed to minimise environmental hazards and reduce health risks to personnel.