Frequently Asked Questions - Special Preservation Codes

Listed below are compiled packaging FAQs for the 'Special Preservation Code' topic. Our Special Preservation Code web page identifies the MIL-STD-2073 code and the corresponding special preservation description. If your question is not listed, please use either our feedback form to add a Packaging FAQ to this listing or E-mail us directly at:

AA Preservation and unit packing identical to commercial package used by supplier for prevention of deterioration and mechanical damage.
AE Seal or plug all openings with approved noncorrosive materials to prevent entrance of moisture, dirt and foreign matter. Package to meet requirements of Method 10.
AH Preserve Method 20 as follows: Fog spray or flush internally with preservative indicated by preservation code. All openings shall then be plugged or sealed to prevent entrance of dirt and moisture. Exterior unpainted ferrous metal surfaces shall be coated with a suitable paint or enamel, or coated with cold application, non-tacky, corrosion preventive compound conforming to MIL-PRF-16173, Grade 4.
AU Preservative compounds shall not be applied to windings, commutators or peripheries of armatures or rotors. Shafts shall be coated with MIL-PRF-16173, Grade 2 preservative and wrapped with MIL-PRF-121, Grade A material, secured in place with ASTM-D5486 tape. Commutators shall be wrapped with MIL-PRF-121, Grade A material, held in place with ASTM-D5486 tape. Exposed surfaces of steel collector rings shall be coated with MIL-PRF-16173, Grade 2 preservative. No preservative is required for bronze, brass, or corrosion resisting metals. All collector rings shall be wrapped with MIL-PRF-121, Grade A material, secured in place with ASTM-D5486 tape. Corrodible surfaces, except shafts, commutators, and collector rings, may be preserved by the use of insulating varnish applied during the manufacturing process. In addition to the foregoing requirements, armatures and rotors shall be wrapped with MIL-PRF-121, Grade A material, secured with ASTM-D5486 tape.
AW Preserve in accordance with any of the following alternate methods (used for gaskets and similar items):
(a) Seal in bags conforming to Class B, C, or E of MIL-DTL-117. using stiffening material internally if needed to maintain rigidity.
(b) Preservation method 42 or 44.
(c) Place between sheet of, or in fold of, corrugated fiberboard of sufficient stiffness to resist bending, overwrap with waterproof wrapping paper conforming to PPP-B-1055 and seal with pressure sensitive tape conforming to ASTM-D5486 or adhesive conforming to MMM-A-260. Authorization to use other waterproof barrier materials maybe granted upon request.
BC Preserve by Method 20 as follows: Coat all pieces of set with preservative compound conforming to MIL-PRF-16173, Grade 4. Wrap or bag each preserved piece individually in MIL-PRF-121. Grade A material. Cushion or segregate individually wrapped or bagged pieces in the storage container to prevent movement and possible physical damage. (Segregated identical pieces, such as buckets and seal strips, are to be kept as close together in the container as possible to facilitate ease of counting.) Individually preserved, wrapped or bagged pieces need not be identified since container markings are in accordance with MIL-STD-129. Itemized packing lists for inclusion within or attachment to the outside of the container shall be furnished in accordance with MIL-STD-129. The lists shall show quantity and nomenclature of all items included in the set. (Used for turbine blade sets and similar items.)
BD Remove parts made of rubber, fiber, and/or nonmetallic materials adversely affected by preservative compounds and package by Method 41 without a preservative. Preserve metal parts of assembly to conform to the requirements of Method 40. Mark the bag containing nonmetallic parts 'Parts for Assembly' and include it within, or securely attached to. the pack containing metal parts in a manner which will assure its being found when the pack is opened. (Use for couplings and similar items.)
BL Plug or seal all openings and preserve Method 20.
DB Preserve by Method 10 modified as follows: Preserve in transparent barrier bag made of L-P-378 or Type III MIL-B-22191 material. L-P-378 or MIL-B-22191, Type III material, PPP-C-1842 or PPP-C-795 cushioning shall be used to cushion sharp edges and protrusions of the preserved items. Bag closure shall be made by any suitable means, except that staples shall not be used. When use of a bag is not practicable, the item shall be completely wrapped in the above barrier or cushioning material and secured with pressure sensitive tape. Also, the use of shaped or molded packs utilizing MIL-B-22191 or L-P-378 materials in conjunction with plastic coated board is acceptable provided the pack's cube is not increased and the pack meets the tests specified in Appendix G. Strip or block form of multiple packages shall incorporate provisions for separating unit quantities.
DC Preserve by Method 20 modified as follows: Preserve in a transparent barrier wrap made of Type II, MIL-B-22191 barrier material, or bag conforming to Type I, Class C, Style 2 of MIL-DTL-117. MIL-B-22191, Type II barrier material shall be used to cushion sharp edges and protrusions of item to prevent bag puncture. PPP-C-1842 or PPP-C-795 may also be used to cushion sharp edges and protrusions if item is first wrapped in MIL-B-22191, Type II barrier material. The bag closure shall be made by any suitable means, except that staples shall not be used. Also, the use of shaped, preformed or molded packages utilizing MIL-B-22191 or L-P-378 materials in conjunction with plastic coated board is acceptable, provided that the package cube is not increased and materials are compatible with preservative specified. However, these packages shall be capable of meeting the tests specified in Appendix G. Strip or block form of multiple packages shall incorporate provisions for separating unit quantities.
DR Preserve Method 30 as follows: Each unit shall have all internal fluid-carrying passages, which are not pre-lubricated, filled with the specified preservative, allowing space for internal thermal expansion. If filling is not practical, the unit shall be internally fog-sprayed or flushed, then drained to the drip point. All ports, fittings, openings, etc. shall be capped or plugged with noncorrosive (non-interacting) metal caps or plugs conforming to MIL-C-5501 or equivalent. All hydraulic preservative operating fluid used shall be filtered through a 3 micron absolute filter prior to being used as specified above. Exterior bare metal surfaces, subject to corrosion, shall be coated with compound conforming to MIL-PRF-16173, Grade 2 or MIL-C-11796, Class 3. Unit shall be wrapped with a greaseproof wrap conforming to MIL-PRF-121, Grade A or equivalent: seal seams with ASTM-D5486 tape to effect a measure of waterproofness and prevent unwrapping. The unit must be adequately cushioned with material specified and placed in a grade V3c container fabricated in accordance with ASTM-D5118 (as a minimum), Style FOL or CSSC. All seams, corners, and manufacturer's joint shall be tape-sealed with two inch tape conforming to ASTM-D5486, Type III or IV.
DW Preserve Method 52 as follows: Item shall be cleaned. wrapped, blocked and braced in an interior carton fabricated in accordance with ASTM-D5118, Class domestic. MIL-B-131 barrier material, sealed as required, shall be utilized around the first container. The cushioning, to be specified under the cushioning code and in the thickness required to adequately protect the item. shall be placed between the barrier and the outer container.
EK Preserve Method 10 as follows: Each bolt shall have the shank and threads protected by means of a sleeve extending over the full length of the shank and thread. The sleeve shall be manufactured from paperboard, asphalt impregnated chipboard, or spiral wrap of kraft paper over chipboard, lined with material conforming to MIL-PRF-121. Plastic sleeve coverings may also be used.
GS Preserve by Method 33 (modified) in a transparent, flexible, sealable, volatile corrosion inhibitor treated bag conforming to MIL-B-22020. The interleaf furnished inside each Class 2, cold sealable bag shall be withdrawn after inserting item and prior to final sealing in accordance with MIL-B-22020. Items with sharp edges or protrusions shall be wrapped with sufficient layers of transparent, flexible, pressure (cold) sealable volatile corrosion inhibitor barrier material conforming to MIL-B-22019, TYPE II to prevent bag puncture. The latex coated (nonprinted) side of the barrier material) shall always be facing the item. Alternately, the item may be completely wrapped with transparent, flexible, pressure (cold) sealable volatile corrosion inhibitor barrier material conforming to MIL-B-22019, TYPE II as indicated above and further preserved in a transparent barrier bag conforming to Type I, Class C, Style 2 of MIL-DTL-117. Closure shall be by heat-sealing when this alternate method is used. In addition to markings required elsewhere in the contract, unit identification and caution labels shall be in accordance with MIL-STD-129.
GX Preserve by Method 41 as follows: Items subject to damage by electromagnetic and electrostatic field forces shall be initially wrapped in material conforming to MIL-B-81705, Type II or Type III. or cushioned in material conforming to PPP-C-1842, Type III. Style A or B, or PPP-C-795. Class 2. or PPP-C-1752. Type VII, Class 1, Grade B. or PPP-C-1797, Type II. to prevent bag puncture, and unit packed in a heat-sealed bag conforming to MIL-DTL-117, Type I, Class F. Style 1. Reclosable cushioned pouches conforming to MIL-P-81997, Type I or II, may be used in lieu of initial wrap or cushioning. Lead or terminal configurations for all items shall be maintained as manufactured without causing loads or stresses capable of causing damage to the item. Materials used to maintain item position and lead or terminal configuration shall permit item removal without damage to the item. Electrostatic discharge (ESD) sensitive caution labels shall be applied in accordance with MIL-STD-129.
HM Packaging and marking for hazardous materials shall comply with applicable requirements for Performance Oriented Packaging contained in the International Civil Aviation Organization (ICAO) Technical Instructions or the International Maritime Dangerous Goods Code (IMDG) and with Code of Federal Regulations (CFR) Title 29. Title 40 and Title 49. All performance test requirements shall be supported by certificates and reports attesting to the date and the results obtained from performance oriented packaging testing. The contractor, if not a self-certifier, shall be responsible for assuring that third party sources providing performance testing services are, in fact, registered with the Department of Transportation. The contractor's signed certification that the packaged configuration meets ICAO or IMDG requirements shall be incorporated on the DD Form 250 Material Inspection and Receiving Report, or other related acceptance document if the DD Form 250 is not used. All certificates and reports shall be available for inspection by authorized Government representatives for a period of three years.
JF Preserve Method 10 Items shall be preserved in a vacuum formed skin pack, formed from either cellulose acetate, cellulose butyrate or cellulose propionate. The material shall be 10 to 15 mils minimum thickness prior to draw and 2 to 4 mils thickness after draw. Class domestic fiberboard meeting the requirements of ASTM-D4727 shall be used as a stiffener.
JM Preserve Method 10 as follows: Unit container shall consist of one piece of 3/8-inch plywood and one piece of double wall fiberboard meeting the requirements of ASTM-D4727, each 4 inches longer and wider than the item dimensions. Place item on plywood, cover with fiberboard and staple fiberboard to plywood on sides and end. For items longer than 96 inches, frame panel in accordance with PPP-B-601 (used for backing boards and similar flat items.)
KD Preserve Method 31. Apply MIL-PRF-32033 preservative. Place item in a bag conforming to MIL-B-22020 and place bagged item into a weather resistant fiberboard box fabricated in accordance with ASTM-D5118. Fill voids with fiberboard meeting the requirements of ASTM-D4727 or A-A-1898, Grade II material as required.
KF Clean each item in accordance with any applicable process. Use non-corrosive material to plug any crevices, holes or cavities. Preserve by directly applying to the clean dry metal surface of the item, strippable, plastic coating compound (hot dipping) conforming to MIL-P-149 or equivalent. Apply the compound in such a way that upon removal, no compound will be retained in the voids. The compound shall be a Type II. transparent, cellulose acetate butyrate variety. Apply as many layers of the plastic coating compound as necessary to protect the item from contact damage and to seal it from moisture. Wrap the individually coated items in MIL-PRF-121 greaseproof, waterproof, barrier material. (Use on labyrinth rings and similar items in sets.)
KG Each fully buttoned shirt shall be neatly folded, secured with stainless steel (AISI Type 304 or 316) pins. aluminum clips or plastic fasteners, and inserted into a snug fitting clear plastic bag. The bag shall be closed by heat sealing, taping (provided the back panel overlaps the front panel), or by a bag designed to effect a reverse tuck enclosure.
KH Each pair of shoes or boots shall be individually wrapped prior to being placed in a shoe box, Each pair of individually wrapped shoes or boots shall be packaged in a set-up style shoe box or a mailer type box.

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Last Updated:  14 Oct 2015