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MIL-PRF-81309

MIL-PRF-81309 is a military performance specification that outlines the requirements for corrosion preventive compounds (cpcs) designed to protect metallic surfaces from corrosion. These compounds are typically used in various industries, including aerospace, automotive, and marine, where the prevention of rust and corrosion is crucial. In military and aerospace applications, metal components are often exposed to harsh environments, such as moisture, salt spray, and industrial pollutants, which can lead to corrosion. View our full list of products which conform to this specification below -

MIL-PRF-81309 Product List

ACF-50 Corrosion Preventative
ACF-50 Corrosion Preventative
Silmid P/N: 
VAR0000532
In Stock
From £10.69 excl VAT
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Armite 12|34 Formula Corrosion Preventative Compound
Armite 12|34 Formula Corrosion Preventative Compound
Silmid P/N: 
P012697
No Stock - Standard lead time 31 business days
From £72.14 excl VAT
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CorrosionX Aviation Corrosion Inhibitor 16oz Aerosol *MIL-PRF-81309H Type II Class II
CorrosionX Aviation Corrosion Inhibitor 16oz Aerosol *MIL-PRF-81309H Type II Class II
Silmid P/N: 
CORRX00016
No Stock - Standard lead time 108 business days
£151.90 excl VAT

Key Characteristics

  • Ultra-thin film: The compounds form a very thin, protective layer on the metal surface.
  • Water-displacing: Capable of displacing water, preventing it from coming into contact with the metal and causing corrosion. They can effectively displace water from metal surfaces, reducing the risk of rust forming in moist environments.
  • Non-staining: They generally do not leave stains or discoloration on the protected surface.
  • Non-hardening: They do not harden or become brittle over time

Types and Classes

MIL-PRF-81309 is divided into various classes and types based on their characteristics and applications:

  • Type I: Water-displacing, soft film
  • Type II: Water-displacing, dry film
  • Type III: Corrosion-preventive with an additional characteristic (e.g., lubrication or electrical insulation)

  • Class I: Bulk container (brush, dip, or spray application)
  • Class II: Aerosol container or spray application

    • Versions

    MIL-PRF-81309H The most recent version of the spec, established July 2018, more recently reviewed in July 2021 where an amendment was made.

    MIL-PRF-81309G Established in July 2014

     MIL-PRF-81309F Version E was superceded in May 2005 by the next version of the spec, version F.

    MIL-PRF-81309E First established in Mar 1993. 3 further amendments were made to this version in Dec 93, Jul 96 and Nov 1997.