TECHNICAL BULLETIN TB-2055
Statshield
®
Smocks
Grounding, Testing and Maintenance
NO WRISTBAND
NECESSARY
Made in the
United States of America
clothing fabrics can dissipate a charge to that person’s
skin and then to ground. Personnel clothing usually is
electrically separate or isolated from the body.” “Groundable
Static Control Garment System, Garments that are used to
establish the primary ground path for a person shall provide
a resistance of less than 35 megohms from the person to
the groundable point of the garment.”[ESD TR20.20-2008
section 5.3.13 Garments]
Statshield
®
smocks are constructed of a lightweight
dissipative material which made from texturized polyester
and a minimum of 9% carbon 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 Statshield
®
smocks
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.
“After verifying that the garment has electrical conductivity
through all panels, the garment should be electrically
bonded to the grounding system of the wearer so as not to
act as a floating conductor.” [ESD TR20.20-2008 section
5.3.13 Garments] The conductive fabric in smock is a
conductor. If not grounded, the smock can become an
isolated charged conductor. If not grounded via a wrist strap
coil cord, ground the ESD garment using ESD footwear to
ESD flooring.
The dissipative material becomes part of the ground path
to remove static charges. Statshield
®
smocks are available
in two lengths -- the lab coat length and the jacket length.
Both lengths are available in two styles - with snaps and
with conductive elastic cuffs. Smocks are available in eight
colors* -- blue, white, teal, black, pink, grey and orange.
Statshield
®
smocks incorporate a “hip-to-cuff” grounding
feature which allows for hands-free grounding with no
cord attached to the operator’s wrist. This feature allows
connection of a ground cord to a 4mm snap stud on the hip.
A seam of carbon-suffused threads provides a secure and
direct electrical connection from the snap stud on the hip
to conductive elastic cuffs. Statshield
®
smocks ground the
person when used in this manner. Standard touch testing or
continuous monitoring can be used to test the “hip-to-cuff”
function.
*Fabric lots vary slightly in color.
COIL CORD (NOT INCLUDED)
TO GROUND
Figure 1. Desco Statshield
®
Premium Lab Coat with
Conductive Cuffs. Also available in Jacket length.
WRISTBAND (NOT INCLUDED)
SNAPS TO CONNECT TO GARMENT
COIL CORD (NOT INCLUDED)
TO GROUND
Figure 2. Desco Statshield
®
Premium Jacket with Snaps.
Also available in Lab Coat length.
Description
Desco’ Statshield
®
smocks smocks are designed to be
antistatic, low tribocharging, and create a Faraday Cage
around the torso and arms of the wearer to protect ESD
susceptible items from electrostatic fields generated by
clothing on the operator’s clothing. Static control garments
are intended to attenuate electrostatic fields that may be
present on personnel clothing. Statshield
®
Smocks meet the
requirement for Groundable Static Control Garment System
per ANSI/ESD S20.20 required limit of < 3.5 x 10
7
ohm Rtg
tested per ANSI/ESD STM2.1 and ESD TR53 (23° ± 1° C,
12% ± 3% RH, and 50% ± 5% RH).
“While a person may be grounded using a wrist strap or
other grounding methods, that does not mean that insulative
DESCO WEST -
3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Web Site:
Desco.com
TB-2055
September 2018 Page 1 of 4
© 2018 DESCO INDUSTRIES INC
Employee Owned
Statshield
®
smocks are available in the following styles and sizes:
LAB COATS WITH SNAPS
Blue
White
X Small
73600 73620
Small
73601 73621
Medium
73602 73622
Large
73603 73623
X Large
73604 73624
2X Large
73605 73625
3X Large
73606 73626
4X Large
73607 73627
5X Large
73608 73628
6X Large
73609 73629
JACKETS WITH SNAPS
Blue
X Small
73699
Small
73700
Medium
73710
Large
73720
X Large
73730
2X Large
73740
3X Large
73741
4X Large
73742
5X Large
73743
6X Large
73744
JACKETS WITH CUFFS
Blue
X Small
73749
Small
73750
Medium
73755
Large
73760
X Large
73765
2X Large
73770
3X Large
73771
4X Large
73772
5X Large
73773
6X Large
73774
White
73820
73821
73822
73823
73824
73825
73826
73827
73828
73829
White
73830
73831
73832
73833
73834
73835
73836
73837
73838
73839
Teal Chest
73640
30"-32"
73641
34"-36"
73642
38"-40"
73643
42"-44"
73644
46"-48"
73645
50"-52"
73646
54"-56"
73647
58"-60"
73648
62"-64"
73649
66"-68"
Teal
73840
73841
73842
73843
73844
73845
73846
73847
73848
73849
Teal
73850
73851
73852
73853
73854
73855
73856
73857
73858
73859
Pink
74210
74211
74212
74213
74214
74215
74216
74217
74218
74219
Black
73860
73861
73862
73863
73864
73865
73866
73867
73868
73869
Sleeve
33 3/8"
34"
34 3/8"
35"
35 1/2"
35 1/2"
37 1/2"
36 1/2"
36"
36"
Grey
73890
73891
73892
73893
73894
73895
73896
73897
73898
73899
Pink
74200
74201
74202
74203
74204
74205
74206
74207
74208
74209
LAB COATS WITH CUFFS
Blue
White
X Small
73610 73630
Small
73611 73631
Medium
73612 73632
Large
73613 73633
X Large
73614 73634
2X Large
73615 73635
3X Large
73616 73636
4X Large
73617 73637
5X Large
73618 73638
6X Large
73619 73639
Chest
30"-32"
34"-36"
38"-40"
42"-44"
46"-48"
50"-52"
54"-56"
58"-60"
62"-64"
66"-68"
Grey
73775
73776
73777
73778
73779
73780
73781
73782
73783
73784
Sleeve
33 3/8"
34"
34 3/8"
35"
35 1/2"
35 1/2"
37 1/2"
36 1/2"
36"
36"
Orange
73910
73911
73912
73913
73914
73915
73916
73917
73918
73919
Chest
30"-32"
34"-36"
38"-40"
42"-44"
46"-48"
50"-52"
54"-56"
58"-60"
62"-64"
66"-68"
Sleeve
33 3/4"
34"
34 3/8"
35"
35 1/2"
35 1/2"
37 1/2"
36 1/2"
36"
36"
Teal
73650
73651
73652
73653
73654
73655
73656
73657
73658
73659
Chest
30"-32"
34"-36"
38"-40"
42"-44"
46"-48"
50"-52"
54"-56"
58"-60"
62"-64"
66"-68"
Sleeve
33 3/4"
34"
34 3/8"
35"
35 1/2"
35 1/2"
37 1/2"
36 1/2"
36"
36"
Note: Blue, Black, Grey, Pink and Orange
Jackets with Cuffs contain a Badge Holder
Tab and Two Sleeve Pen Pockets.
DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Web Site:
Desco.com
TB-2055
Page 2 of 4
© 2018 DESCO INDUSTRIES INC
Employee Owned
Installation
Follow the directions below for proper installation and
grounding of the Statshield
®
smock.
YES!
NO!
YES!
NO!
Figure 3. Proper installation of smock wearer’s body
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. Throughout use, it is essential that conductive cuff (or the
wristband) be in contact with operator’s skin; the
conductive cuff (or the wristband) should never be
allowed to be pulled up and over shirt sleeve.
3. Install a coil cord to the snap stud located above the left
hand hip pocket. Connect the other end of the coil cord
to a verified ground point or continuous monitor.
Figure 5. Testing and monitoring of smock and ground
cord assembly
Grounding Integrity Testing
For daily testing or continuous monitoring of the grounding
integrity of Statshield
®
smocks and ground cords, we
recommend testing the smock while worn and the use of
a 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 Meter Kit Item #19290. Place the
two five-pound electrodes on different panels to test. Unless
properly grounded, the smocks can hold a charge and
become a possible source for discharge to ESD sensitive
items. For additional information, refer to ANSI/ESD S20.20,
ESD TR20.20, ESD TR53 and the Garment Standard,
ANSI/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.
Figure 4. Grounding the smock
NOTE: ANSI/ESD S20.20 RECOMMENDS THAT THE
GROUND COIL CORD SELECTED FOR GROUNDING OF
PERSONNEL CONTAIN A BUILT-IN CURRENT LIMITING
1 MEGOHM RESISTOR.
19276
&
19277
19784
19290
Figure 6. Testers
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.
DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Web Site:
Desco.com
© 2018 DESCO INDUSTRIES INC
Employee Owned
TB-2055
Page 3 of 4
Maintenance
Statshield
®
smocks must be laundered periodically for
proper operation. Desco recommends Woolite. Liquid
detergents are better than dry because there is less caking
and frictional wear. Use only non-ionic softeners and
detergents when laundering. Launder Statshield
®
smocks in
cool or warm water, tumble dry with low heat or hang dry.
DO NOT USE BLEACH OR FABRIC SOFTENER.
Launder Statshield
®
smocks by hand or with a washing
machine. Use a standard household machine on gentle
cycle or use an industrial machine if “Pony” (typically
under 200 pound loads) machines are used. It is not
recommended to launder these Statshield
®
smocks in heavy
industrial laundry machines because it will lead to premature
wear; degrading the ESD properties. Statshield
®
smocks
should be tumbled dry using low heat.
The carbon-suffused mono-filament nylon is sensitive to
heat and should not be exposed to laundering heat in
excess of 120°F. Under normal wearing and recommended
washing conditions, Desco Statshield
®
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.
Limited Warranty, Warranty Exclusions, Limit of
Liability and RMA Request Instructions
See
Desco Terms and Conditions
Specifications
Fabric Weight*
Fabric Content
Carbon Mono-filament
Surface Resistance
Glass Transition Temp
Flash Point
2.2 oz per square yard
Texturized polyester and a
minimum of 9% carbon
mono-filament nylon.
Conductive at 1 x 10
4
ohms,
nonflaking and non-sloughing.
1 x 10
5
< 1 x 10
7
ohms, per
ANSI/ESD STM2.1 and ESD
TR53 of Fabrics
250°F
1040°F
*Fabric lots vary slightly in color and weight.
DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Web Site:
Desco.com
TB-2055
Page 4 of 4
© 2018 DESCO INDUSTRIES INC
Employee Owned
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