A typical static shielding bag has a surface resistance of +/-10E11 ohm, inside surface and outside surface.

Let's say there's a DDR3 module inside a static shielding bag in such a way that all the pins of the memory module are making contact with the inside of the static shielding bag. And let's say i touch the inside surface of the bag.

Then will the voltage between me and the memory module be equalized safely?

If so, is it safe to say you can use a static shielding bag instead of an anti-static work surface mat, whenever there is no proper anti-static mat available? Because it's all about surface resistance, not about the material?


One cannot use static-shielding bags INSTEAD of anti-static surface mat, they must be used together to have safe handling of ESD sensitive components. The voltage between you and the memory will not dissipate, the charge will be equalized. The charge can be dissipated only into grounded anti-static mat. If you didn't discharge yourself into grounded mat, the charged memory will produce ESD when you try to plug it into PC mainboard, or whatever operation you are performing.

  • \$\begingroup\$ Yes, the charge will be equalized, not dissipated. I'll correct my question. But i don't understand yet why i shouldn't use a static shielding bag as a temporary anti-static mat. \$\endgroup\$ – Marty Oct 27 '16 at 18:40
  • \$\begingroup\$ Because the bag is not grounded, in contrast with grounded floor mat or grounded table mat. There is no path to dissipate the body's charge. \$\endgroup\$ – Ale..chenski Oct 27 '16 at 18:43
  • \$\begingroup\$ Since you changed the formulation, then yes, the voltage difference between you and memory module will disappear. However, the charge between [you+memory] relative to surrounding equipment will remain high, which does not help to avoid ESD when handling the memory module. \$\endgroup\$ – Ale..chenski Oct 27 '16 at 19:02
  • \$\begingroup\$ Thanks for the reply. This i wanted to know. So, when touching the inner surface of the bag, the memory module and i, we reach zero potential. This happens safely, because of the surface resistance. When i am grounded to earth, trough a wrist strap, while touching the inner surface, then the memory module will reach earth potential too, right? \$\endgroup\$ – Marty Oct 28 '16 at 6:38

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