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Teledyne API Model T360/T360M Operation Manual A Primer on Electro-Static Discharge
267
build. In some conditions, a charge large enough to damage a component
can rebuild in just a few seconds.
Always store sensitive components and assemblies in anti-ESD storage
bags or bins:
Even when you are not working on them, store all devices
and assemblies in a closed anti-Static bag or bin. This will prevent induced
charges from building up on the device or assembly and nearby static fields
from discharging through it.
Use metallic anti-ESD bags for storing and shipping ESD sensitive
components and assemblies rather than pink-poly bags.
The famous,
“pink-poly” bags are made of a plastic that is impregnated with a liquid
(similar to liquid laundry detergent) which very slowly sweats onto the surface
of the plastic creating a slightly conductive layer over the surface of the bag.
While this layer may equalizes any charges that occur across the whole bag, it
does not prevent the build up of static charges. If laying on a conductive,
grounded surface, these bags will allow charges to bleed away but the very
charges that build up on the surface of the bag itself can be transferred through
the bag by induction onto the circuits of your ESD sensitive device. Also, the
liquid impregnating the plastic is eventually used up after which the bag is as
useless for preventing damage from ESD as any ordinary plastic bag.
Anti-Static bags made of plastic impregnated with metal (usually silvery in color)
provide all of the charge equalizing abilities of the pink-poly bags but also, when
properly sealed, create a Faraday cage that completely isolates the contents from
discharges and the inductive transfer of static charges.
Storage bins made of plastic impregnated with carbon (usually black in color) are
also excellent at dissipating static charges and isolating their contents from field
effects and discharges.
Never use ordinary plastic adhesive tape near an ESD sensitive device
or to close an anti-ESD bag.
The act of pulling a piece of standard plastic
adhesive tape, such as Scotch
®
tape, from its roll will generate a static
charge of several thousand or even tens of thousands of volts on the tape
itself and an associated field effect that can discharge through or be induced
upon items up to a foot away.
07272B DCN6552