ESD packaging
Selecting and using packaging for electrostatic-discharge-sensitive items, with EPA boundaries, shielding, closure, reuse, and moisture-control distinctions.
Tags: delivery, packaging, esd, electronics
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Purpose and specification boundary
The EOS/ESD Association describes low-charging, conductive or dissipative packaging inside an electrostatic protected area (EPA), with discharge shielding also needed outside. Assess the actual transport path: crossing an unprotected corridor between two workstations leaves the EPA even if both endpoints are controlled. EOS/ESD fundamentals, part 3, Desco handling guidance
The EOS/ESD Association lists ANSI/ESD S541-2026 as its packaging-material standard supporting an S20.20 control program, with referenced test methods and limits. Use the edition required by the applicable program rather than assuming an older supplier drawing demonstrates every requirement of the latest edition. EOS/ESD Association S541-2026 scope
Packaging is part of a system. It does not make an ordinary bench an EPA, ground an operator, or protect an exposed assembly after unpacking. Desco's handling guidance places unpackaged sensitive items in an EPA with appropriate personnel grounding and uses shielding enclosures for movement outside it. Desco ESD handling procedures
Distinguish the protective properties
These functions should be identified separately:
| Property | Function | Selection implication |
|---|---|---|
| Low charging | Limits charge generated by contact and separation, including inserting an item. | Resistance alone does not establish this property. |
| Conductive or dissipative behavior | Provides a path through which charge can be removed when appropriately grounded. | A resistance result is not, by itself, a package shielding result. |
| Discharge shielding | Limits the discharge reaching an enclosed sensitive item. | Evaluate the enclosure and relevant shielding test, not merely film appearance. |
Bounded product example: shielding bag
SCS 1000 Series metal-in static shielding bags, drawing dated August 2023, use a polyester/metal/polyethylene laminate. The manufacturer attributes shielding to the metal layer working with the dielectric and describes the exterior as dissipative when grounded. It lists typical ESD shielding below 10 nJ under ANSI/ESD STM11.31, separately from surface-resistance data under STM11.11. That is a named product's test claim, not a universal damage threshold for every electronic device or proof that any silver bag is equivalent. SCS 1000 Series drawing
The drawing distinguishes open-top 1000 Series from ZipTop 3000 Series styles, says the bags are heat sealable, and identifies lot-code marking for traceability. It also states that the product is for commercial use and is not on the Defense Standardization Program Qualified Product Listing. Match the actual purchased style and specification to the application instead of inferring military qualification from an ESD symbol. SCS product construction and limitations
Closure and opening
A shielding bag must enclose its contents. Desco's closure guidance recommends heat sealing, or folding the opening and securing it with an ESD label or antistatic tape. It discourages staples because they introduce a conductive path through the bag. A taped flap is an ESD closure method described for its shielding bags; it is not automatically a moisture-tight dry-pack seal. Desco closure guidance, question 1149
Choose a size that contains the entire assembly without exposed leads or corners and leaves room for the specified closure. Keep the enclosure closed while outside the EPA and open it under the receiving ESD procedure. Desco specifically includes lids on shielding totes and boxes, not just bag mouths. Its document references older standard editions; use it for the stated handling principles, with the current program governing qualification and verification. Desco enclosure and handling procedures
Reuse and condition
Reuse depends on the material and the organization's approved verification process. Desco's handling article calls for testing before reuse and disposal of packaging with tears, cracks, or holes. A quick visual check can find obvious damage, but cannot establish the electrical performance of an apparently intact multilayer package. Do not invent a fixed number of reuse cycles from a new-film test result. Desco reuse guidance
A different named product has a different restriction: Protektive Pak's 49100 drawing, May 2023, describes low-charging pink polyethylene bags and expressly says they should not be reused because their ESD properties decline over time. It does not give a discharge-shielding test claim. These bags therefore should not be substituted for a qualified shielding enclosure merely because both are sold as ESD-related packaging. The restriction belongs to this product, not every pink polymer formulation. Protektive Pak 49100 drawing
Moisture protection is a separate requirement
A device can require moisture protection, ESD protection, or both. SCS Dri-Shield 3400, in the actual drawing dated October 2026, is a foil moisture-barrier bag intended for both moisture- and ESD-sensitive electronics. The drawing lists moisture-vapor transmission and ESD shielding separately, and describes the dry-package system as barrier bag, desiccant, and humidity indicator card. A humidity indicator monitors conditions; it does not replace the barrier or absorb moisture. SCS Dri-Shield 3400 drawing
For this product the manufacturer specifies heat-sealing conditions and suitability for vacuum packaging. Follow the qualified dry-pack process and component moisture-handling requirements; the ESD classification alone cannot establish floor life, desiccant quantity, or storage duration. Conversely, a generic vapor-barrier pouch does not establish ESD shielding. Compare the actual material, seal, test methods, and required protection rather than selecting by foil appearance. Dri-Shield 3400 construction and application
Define the complete package
For custom packages, record usable internal dimensions, opening/closure style, contact protection, mechanical support, and markings. SCS's April 2025 custom moisture-barrier worksheet distinguishes open, zipper, and tear-open options and advises evaluating a sample before selecting size. Its dimensional guidance is a starting point, not proof of fit for every assembly. SCS custom bag worksheet
A reviewable packaging instruction identifies the item and susceptibility, approved packaging product, closure, allowed reuse, receiving/opening location, and any separate moisture or mechanical requirements. Preserve manufacturer and lot information so the material used can be matched to its qualification. Evaluate the completed package through the governing ESD program; a film data sheet alone does not validate every possible assembly, closure, or transit arrangement.