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What are the requirements of a "GX" preservation method code?

The most correct description of Code "GX" is located within MIL-STD-2073-1, Table J.Ia*:

"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-PRF-81705, Type III, or bags conforming to MIL-DTL-117, Type II, Class H, Style 2, or cushioned in material conforming to A-A-3129, Type I, Grade B or PPP-C-795, Class 2 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. Re-closable cushioned pouches conforming to MIL-DTL-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."

Note: MIL-PRF-81705, Type II is obsolete due to no approved sources available.

  • ESD and PHYSICAL protection are required for contacts, leads, terminals, and other protrusions by means of wrapping/ cushioning, container design, and other ESD protective devices. Components with pins or leads shall have adequate cushioning to PREVENT DAMAGE, BREAKAGE and/or BENDING OF LEADS when not specified in packaging codes.
  • This item requires DOD QUALIFIED Electrostatic Discharge (ESD) and/or Electromagnetic Interference (EMI) protective packaging materials in accordance with MIL-PRF-81705.
  • For ESD protection MIL-PRF-81705, Type I (MIL-DTL-117, Type I, Class F, Style 1) converted bag barrier material shall be used along with MIL-PRF-81705, Type III (MIL-DTL-117 Type II, Class H, Style 2) barrier material wrap if the contract doesn't specifically require ESD approved cushioning. For EMI protection MIL-PRF-81705, Type I (MIL-DTL-117, Type I, Class F, Style 1) converted bag barrier material shall be used.
  • The supplier shall be responsible for verifying that all MIL-PRF-81705 barrier materials (or converted bags) were supplied from a qualified manufacturer currently listed on QPL-81705.
  • Direct qualification requirement:
    • MIL-PRF-81705 has the qualification requirement directly in the specification
  • Indirect qualification requirement:
    • The MIL-DTL-117 Type II, Class H, Style 2 bags have First Article requirements. However, to construct the Type II, Class H, Style 2 bag, it uses qualified MIL-PRF-81705, Type III material.
  • Indirect qualification requirement:
    • The MIL-DTL-81997 Type I pouches have First Article requirements. However to construct the Type I pouch, it uses qualified MIL-PRF-81705, Type III material (and a choice of either A-A-3129, Type I, Grade B or PPP-C-795, Class 2 cushioning material with a reclosable top).
  • Indirect qualification requirement:
    • The MIL-DTL-117 Type I, Class F, Style 1 bags have First Article requirements. However, to construct the Type I, Class F, Style 1 bag, it uses qualified MIL-PRF-81705, Type I material.
    • MIL-STD-2073-1, paragraph 5.2.3 requires all ESD items to have packaging materials to counteract electrostatic and electromagnetic field forces.
    • MIL-STD-2073-1, paragraph 5.2.4.1 states "ESDS items shall be preserved in accordance with Table J.Ia, Code "GX."
    • MIL-STD-2073-1, paragraph 4.2 requires contractors to report missing contractual packaging data to the contracting officer. Your company must immediately contact the administering activity and request either an amendment or modification to the solicitation or contract for the inclusion of the packaging requirements.

Category: ESD Preservation