TB-3008
March 2010 Page 1 of 2
Static Control Smocks
Grounding, Testing and Maintenance
TECHNICAL BULLETIN TB-3008
Figure 1. Desco Static Control Garment
Description
Outfitting a work force in ESD smocks is the single most
powerful step to demonstrate a company’s commitment
to their ESD control program. The Desco ESD protective
smock is designed to be antistatic, low tribocharging, and
offers protection against electro static fields generated from
clothing on the user’s body. Using high quality material
with minimum 9% carbon nylon monofilament, the smock
creates a Faraday Cage around the torso of the wearer.
Static charges generated by the wearer and wearer’s
clothing will be shielded from ESD susceptible products.
The dissipative material becomes part of the ground path to
remove static charges. The smock is jacket length and the
color is blue.
The smock is constructed of a lightweight dissipative
material which incorporates texturized polyester and a
minimum of 9% carbon suffused nylon monofilament.
The conductive nylon fibers are woven in a chain-link
design throughout the material, providing continuous and
consistent charge dissipation. All of the seams in the
garment are designed to maintain electrical continuity from
panel to panel and from sleeve to sleeve in accordance with
the ESD Association Garment Standard, ESD-STM2.1.
The elastic in sleeve end is designed to provide contact of
dissipative fabric with user’s skin to provide path to ground.
The conductive fabric in smock is a conductor. If not
grounded, the smock can become an isolated charged
conductor.
Since ANSI/ESD S20.20 requires that “All
conductors in the environment, including personnel,
must be . . . connected and attached to a known
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DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Web Site:
ground”
, there is no occasion “when grounding the
garment is not required” in an ESD protected area. If not
grounded via a wrist strap coil cord, ground ESD garment
via the person’s wrist removing charges using foot
grounders, to ESD protective flooring.
ESD protective economy smocks are available in the
following sizes:
Size
Blue
Chest
Sleeve
X Small
30”-32”
33 3/4”
Small
34”-36”
34”
Medium
38”-40”
34 3/8”
Large
42”-44”
35”
X Large
46”-48”
35 1/2”
2X Large
50”-52”
35 1/2”
3X Large
54”-56”
37 1/2”
4X Large
58”-60”
36 1/2”
5X Large
62”-64”
36”
6X Large
73889
66”-68”
36”
Installation
Follow the directions below for proper installation and
grounding of the ESD smock.
1. Put on the smock and fasten all of the snaps on the front
of the smock, making sure that clothing is not exposed
outside of the smock.
2. Make sure the elastic in sleeve cuff is snug on your wrist.
Place a wristband on your wrist. Connect a grounded coil
cord to the wristband. (Alternatively, foot grounders and
ESD protected flooring can provide path to ground.)
The user and the smock will now be properly grounded. The
user needs to verify that the smock is grounded through
skin contact.
NOTE: ANSI/ESD S20.20 REQUIRES THAT THE
GROUND CORD SELECTED FOR GROUNDING OF
PERSONNEL CONTAIN A BUILT-IN CURRENT LIMITING
1 MEGOHM RESISTOR.
YES!
NO!
YES!
NO!
© 2010 DESCO INDUSTRIES INC.
Employee Owned
Figure 2. Proper installation of smock on wearer’s body
