Frequently Asked Questions: Preservation Method 20

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Listed below are portions of MIL-STD-2073 covering preservation method 20 (formerly Method I) for preservative coating only (with greaseproof wrap as required). This web page identifies the method, types of materials authorized, a graphic illustration, and a link to the School of Military Packaging Technology's 'How To' web documents. If this material does not enhance your understanding regarding this method of preservation, please use either our feedback form to provide recommendations or contact us directly by E-mail us at:

    illustration of preservation method 20
  • How should items that require Method 20 be packaged?
    Per MIL-STD-2073, 'Items shall be treated with appropriate preservatives in accordance with procedures of or Contact preservative coated items shall be wrapped in a material conforming to MIL-PRF-121, Grade A, or QQ-A-1876. Flexible wraps shall snuggly enclose the coated part or item and be secure to prevent unintentional unwrapping. Parts or items coated with hard film preservatives conforming to MIL-PRF-16173, Grade 1 or 4, may, when dried, be exempted from wrapping. Items preserved with VCI treated materials conforming to MIL-PRF-3420 or MIL-PRF-22019, respectively taped or sealed to form an airtight enclosure, are also exempted from wrapping. Projections, sharp edges, or other features of the item, which may damage the barrier wrap, shall be cushioned as required in accordance with 5.2.3. The type of cushioning and barrier material used shall be commensurate with the size, weight and configuration of the preserved part or item. Method 20 packs shall pass the applicable inspection requirements of table G.I.'

    • NOTE: The packaging requirements (code) in your contract may specify the exact packaging materials to use to protect the item.

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Last Updated:  5 Oct 2015