Desco 73880 Manual

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 electrostatic 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
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: Desco.com
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 73880 30”-32” 33 3/4”
Small 73881 34”-36” 34”
Medium 73882 38”-40” 34 3/8”
Large 73883 42”-44” 35”
X Large 73884 46”-48” 35 1/2”
2X Large 73885 50”-52” 35 1/2”
3X Large 73886 54”-56” 37 1/2”
4X Large 73887 58”-60” 36 1/2”
5X Large 73888 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

TB-3008 Page 2 of 2
Heat Sealed Patches
It is possible to heat seal patches to our smocks. The patch
should be small and the smock should be tested before and
after application.
Grounding Integrity Testing
For daily testing or monitoring of the grounding integrity
of Desco ESD protective smocks and ground cords, we
recommend the use of standard wrist strap testers or
single-wire workstation continuous monitors.
Panel to panel conductivity is essential so as not to leave
portions of the smock as isolated charged conductors.
Panel to panel conductivity is easy to test using our
Surface Resistance/ Resistivity Tesk Kit Item #19770, by
placing 5 pound electrodes on different panels. Unless
properly grounded, the smocks can hold a charge and
become a possible source for discharge to ESD susceptible
products. For additional information, refer to ANSI/ESD
S20.20 and the ESD Association Garment Standard,
ESD-STM2.1.
Desco has several testers available for this purpose. For
more information ask for specification drawings or operating
instruction manuals by item number.
Maintenance
For proper operation, the ESD protective smock must be
laundered periodically. Launder garment in cool or warm
water, tumble dry with low heat or hang dry. DO NOT
BLEACH. The carbon-suffused mono-filament nylon is
sensitive to heat and should not be exposed to laundering
heat in excess of 120°F. Use only non-ionic softeners and
detergents when laundering. Under normal wearing and
recommended washing conditions, Desco ESD protective
smocks will maintain their usefulness and effectiveness
for a minimum of 100 washings. Some other ESD smocks
have as little as 1% suffused carbon and lose their ESD
protective qualities after a few washings.
Specifications
Fabric Weight 2.3 oz per square yard
Fabric Content Texturized polyester and
minimum 9% carbon mono-
filament nylon.
Carbon Mono-filament Conductive at 104ohms, non-
flaking and non-sloughing.
Surface Resistivity 105- 106ohms, per ESD-STM2.1
of Fabric
Static Decay Rate 5000 volts to 500 volts in less than
0.1 seconds, per FTMS-101C
Glass Transition Temp 250°F
Flash Point 1040°F
Note: Material sample swatches are available upon
request. Fabric lots vary slightly in color and weight. If
you have any question please don’t hesitate to request
a sample material from our Customer Service Team.
19350
19250
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Web Site: Desco.com
Limited Warranty
Desco expressly warrants that for a period of one (1) year from the date
of purchase or (100) one-hundred wash cycles, whichever occurs first,
Desco garments will be free of defects in material (parts) and workmanship
(labor). Within the warranty period, a garment will be replaced at Desco’s
option, free of charge. Call Customer Service at 909-627-8178 (Chino,
CA) or [phone] (Canton, MA) for Return Material Authorization
(RMA) and proper shipping instructions and address. Include a copy of
your original packing slip, invoice, or other proof of date of purchase. Any
garment under warranty should be shipped prepaid to the Desco factory.
Warranty replacements will take approximately two weeks.
Warranty Exclusions
THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF
ALL OTHER PRODUCT WARRANTIES, EXPRESSED AND IMPLIED,
INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED. The express
warranty will not apply to defects or damage due to accidents, neglect,
misuse, alterations, operator error, or failure to properly maintain, clean or
repair products.
Limit of Liability
In no event will Desco or any seller be responsible or liable for any injury,
loss or damage, direct or consequential, arising out of the use of or
the inability to use the product. Before using, users shall determine the
suitability of the product for their intended use, and users assume all risk
and liability whatsoever in connection therewith.
© 2010 DESCO INDUSTRIES INC.
Employee Owned
Figure 3. Grounding the smock
Figure 4. Testers
19780