Do ESD bags need to be sealed?

Components that can be damaged by electrostatic discharges

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Warning symbol denoting a device's susceptibility to electrostatic discharge. Symbol for an ESD protection device &#; EPA Alternate warning symbol Symbol of an ESD grounding point for all components

An electrostatic-sensitive device (often abbreviated ESD) is any component (primarily electrical) which can be damaged by common static charges which build up on people, tools, and other non-conductors or semiconductors.[1] ESD commonly also stands for electrostatic discharge.

Overview

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As electronic parts like computer central processing units (CPUs) become packed more and more densely with transistors the transistors shrink and become more and more vulnerable to ESD.[citation needed][2]

Common electrostatic-sensitive devices include:

The notion of a symbol for an ESD protection device came about in response to the increased usage and failures of static sensitive components by then the computer systems manufacturer, Sperry Univac. Field repairs to and handling of ESD printed circuit boards (PCBs) were resulting in extremely high failure rates. Studies of PCB failures indicated that static damage to chips and PCBs were being caused by field service engineers who were often unaware of the need to employ precautionary procedures in handling ESD sensitive parts. In response to this problem, Robert F. Gabriel, a Systems Engineer at Sperry Univac devised a large number of possible symbols that could be affixed to parts, packaging, and PCBs to alert the user that the part is ESD-sensitive. Gabriel developed a proposal for an ESD warning symbol and circulated it to numerous electronics standards groups. C. Everett Coon at the EIA (Electronics Industry Association) enthusiastically responded to the concept and coordinated a world-wide effort among various standards bodies and interest groups to devise an appropriate symbol that would be void of any verbiage and be quickly recognizable that handling precautions were necessary for the ESD item. After three years of worldwide debate over the graphics and the color scheme that would be used the symbol at the top right of this page was adopted in the late s. Variations to the design have been adopted afterwards by some but the most recognizable symbol remains as was adopted.

ESD-safe working

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Often an ESD-safe foam or ESD-safe bag are required for transporting such components. When working with them, a technician will often use a grounding mat or other grounding tool to keep from damaging the equipment. A technician may also wear antistatic garments or an antistatic wrist strap.[3]

There are several kinds of ESD protective materials:[4]

• Conductive: Materials with an electrical resistance between 1kΩ and 1MΩ
• Dissipative: Materials with an electrical resistance between 1MΩ and 1TΩ
• Shielding: Materials that attenuate current and electrical fields
• Low-charging or Anti-static: Materials that limit the buildup of charge by prevention of triboelectric effects through physical separation or by selecting materials that do not build up charge easily.

See also

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References

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1. ^

   DIN EN -5-1 Elektrostatik &#; Teil 5-1: Schutz von elektronischen Bauelementen gegen elektrostatische Phänomene &#; Allgemeine Anforderungen (IEC -5-1)

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   Workmanship Manual for Electrostatic Discharge Control: NASA-HDBk-.21 &#; Feb NASA (Author) 54 pag. ISBN , ISBN 978-

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   J.J. Liou. Electrostatic Discharge Protection: Advances and Applications, 320 pag. ISBN 978-, ISBN

4. ^

   S. H. Voldman, "The state of the art of electrostatic discharge protection: physics, technology, circuits, design, simulation, and scaling," in IEEE Journal of Solid-State Circuits, vol. 34, no. 9, pp. -, Sept. , doi: 10./4..

ESD shielding bags are commonly used for the packaging of electronic components to prevent damage caused by electrostatic discharge events that electronic devices can be prone to. It is important to understand how to use ESD shielding bags properly.

The following 5 tips should help you use ESD shielding bags properly:

1. Shielding bags should be large enough to enclose the entire product within.
   The shielding bag should be closed with a label or tape. Alternatively, you can use a zipper-style shielding bag. This ensures that electrostatic shielding is provided. This is the only way to ensure that ESD sensitive devices placed inside the shielding bag are protected - an unsealed ESD bag offers NO protection!
   

2. Eliminate charges from the ESD Shielding Bags
   When receiving an ESD sensitive device packaged in a shielded bag, be sure to place the closed shielded bag on the ESD work surface before removing the product. This will eliminate any charge that may have accumulated on the surface of the shielding bag.
   

3. Do not overuse shielding bags
   If the shielding bags are undamaged, it is acceptable to re-use them. However, any holes, tears or excessive wrinkles on the shielding bag are all signs that the bag should be discarded.
   

4. Shielding bags are not a working surface area
   ESD shielding bags are just to keep the ESD sensitive products away from ESD damage.
   You should use a properly grounded ESD work surface for working with ESD sensitive products.
   

5. Do not handle ESD sensitive devices with Shielding Bags
   Do not use a shielding bag as an &#;ESD potholder&#; or &#;ESD glove&#; to handle ESD sensitive devices because it does not offer any ESD protection to the devices. You should always use wrist straps or heel grounders to handles ESD sensitive devices.
   

For more technical information about ESD shielding bags, please visit the below thread:

Metal In vs Metal Out ESD Bags

Anti-Static, ESD, Clean Room Products

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Both metal in and metal out bags are effective for ESD protection of static sensitive devices. Metal shielding bags have multiple layers of material in their construction which typically consist of a layer of metal, usually aluminum, static dissipative polyethylene and polyester and a type of coating to help with abrasions. Metal In also known as buried metal bags have the metal shield closer to the inside of the bag between the layer of static dissipative polyethylene and polyester. The Met&#;