ANTI-STATIC ESD PROTECTIVE
vinyls, and other static-generating materials
(table 2-9) where ESDS items are handled
MATERIALS
out of their ESD protective packaging.
Anti-static materials are normally plastic type
Place the ESD protective material
materials (such as polyethylene, polyolefin,
containing the ESD item on a grounded
polyurethane, nylon), which are impregnated with
an anti-static substance. This anti-static migrates
work bench surface to remove any charge
to the surface, and combines with the humidity
before opening the packaging material.
in the air to form a conductive sweat layer on the
Personnel must attach personnel grounding
surface. This layer is invisible and, although
straps to ground themselves before removing
highly resistive, is amply conductive to prevent
the buildup of electrostatic charges by triboelectric
ESDS items from their protective packaging.
(or rubbing) methods in normal handling. Simply
stated, the primary asset of an anti-static material
Remove ESDS items from ESD protective
packaging with fingers or metal grasping tool
is that it will not generate a charge on its surface.
However, this material won't protect an enclosed
only after grounding and place on the ESD
ESD device if it comes into contact with a charged
grounded work bench surface.
surface.
This material is of a pink tint, a symbol of its
Make periodic electrostatic measurements
at all ESD protected areas. This assures the ESD
being anti-static. Anti-static materials are for
inner-wrap packaging. However, anti-static trays,
protective properties of the work station and all
vials, carriers, boxes, etc., are not used unless
equipment contained there have not degraded.
components and/or assemblies are wrapped in
conductive packaging.
Perform periodic continuity checks of
personnel ground straps (between skin contact
HYBRID ESD PROTECTIVE BAGS
and ground connection), ESD grounded work
station surfaces, conductive floor mats,
Lamination of different ESD protective
and other connections to ground. Perform
material (that is, conductive and anti-static) is
this check with a megohmmeter to make sure
grounding resistivity requirements are met.
available that provides the advantage of both in
a single bag.
ESDS DEVICE PACKAGING
ESDS DEVICE HANDLING
The following are general guidelines applicable
Before an ESDS item leaves an ESD protected
area, package the item in one of the following
to the handling of ESDS devices:
ESD protective materials:
Make sure that all containers, tools, test
equipment, and fixtures used in ESD
Ensure shorting bars, clips, or non-
protective areas are grounded before
corrective conductive materials are correctly
inserted in or on all terminals or connectors.
and/or during use, either directly or by
contact with a grounded surface.
Package ESD items in an inner wrap, of
Personnel handling ESDS items must
type II material conforming to MIL-B-81705,
avoid physical activities in the vicinity of
and an outer wrap of type I material con-
ESDS items that are friction-producing, for
forming to MIL-B-81705. You may use a
example, removing or putting on smocks, wiping
laminated bag in instead of the above pro-
feet, sliding objects over surfaces, etc.
vided such meets the requirements of M-B-81705.
Cushion-wrap the item with electrostatic-
free material conforming to PPP-C-1842,
Personnel handling ESDS items must wear
cotton smocks and/or other anti-statically
type III, style A. Place the cushioned item into
treated clothing.
a barrier bag fabricated from MIL-C-131 and
heat-seal closed, method 1A-8. Place the wrapped,
cushioned, or pouched ESDS item in bags con-
Avoid the use or presence of plastics,
synthetic textiles, rubber, finished wood,
forming to MIL-B-117, type I, class F, style 1.
