Super Shield
TM
Nickel Conductive Coating
841AR Technical Data Sheet
841AR-Aerosol
Description
The 841AR
Super Shield
TM
Nickel Conductive Coating
is a one-part durable acrylic lacquer pigmented with
a highly conductive nickel flake, packaged in convenient aerosol format. It utilizes a solvent based system
with no heat cure necessary. The cured coating is smooth, hard, and abrasion resistant. It provides strong
adhesion to plastics, excellent conductivity, and strong corrosion resistance, even in marine environments.
Applications & Usages
The 841AR is designed to provide a conductive coating to the interior of plastic electronic enclosures to
suppress EMI/RFI emissions. It excels when corrosion resistance is a concern.
The 841AR is commonly used by manufacturers of these devices:
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Sensors
Controllers
Receivers
Test Equipment
Scientific equipment
Medical Equipment
Communication devices
Satellite dishes and radar systems
Antennas
Aerospace applications
Electric vehicles
Cable boxes
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Networking gear, firewalls
Military equipment
Cellphones, laptops, PDA’s
GPS’s, navigation systems
TV’s, monitor’s, and displays
Consumer electronics
Electronic sporting equipment
Audio equipment
Electric guitars and other amplified
instruments
Drones and other RC vehicles
Other applications for 841AR include:
•
Repairing damage to existing shielding
•
Conductive undercoat for electroplating
•
Protecting metal surfaces from oxidation
•
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Providing electric continuity for circuits
Grounding
Benefits and Features
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UL Recognized
(File #
E202609)
Provides effective EMI/RFI shielding over a broad frequency range
Volume resistivity of 0.0076
cm
Smooth, durable and, abrasion resistant
Available in liquid format
Quick dry time, no heat cure required
Mild solvent system
Strong adhesion to acrylic, ABS, polycarbonate, and other injection molded plastics
Excellent adhesion to wood and ceramics
Corrosion resistant, suitable for marine environments
Low VOC; HAP Free; Does not contain toluene, xylene, or MEK
ENVIRONMENT
RoHS Compliant
Low-VOC
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Super Shield
TM
Nickel Conductive Coating
841AR Technical Data Sheet
841AR-Aerosol
Usage Parameters
Properties
Recoat time (liquid)
Drying Time @22 °C [72 °F]
Drying Time @65 °C [149 °F]
Shelf Life
Theoretical 340G Spray
Can Coverage
a)
Value
3 min
24 h
30 min
2y
≤2 500
cm
2
≤390
in
2
Temperature Ranges
Properties
Constant Service
Temperature
Intermittent Temperature
Limits
Storage Temperature Limits
Value
-40 to 120 °C
[-40 to 248 °F]
-50 to 125 °C
[-58 to 257 °F]
-5 to 40 °C
[23 to 104 °F]
b)
a) Idealized estimate based on a coat thickness
of 50
m
[2.0 mil] and 50% transfer
efficiency
b) The product must stay within the storage
temperature limits stated.
A
TTENTION
!
Aerosol
container will be crushed at ≤-26.5
°C
[≤15.7 °F].
Principal Components
Name
Nickel Flake (high purity)
Acrylic Resin
Acetone
Dimethyl carbonate
Heptan-2-one
CAS Number
7440-02-0
25608-33-7
67-64-1
616-38-6
110-43-0
Properties of Cured 841AR
Electrical & Magnetic Properties
Volume Resistivity
Surface Resistance
Surface Resistance :
1 coat @2.1 mil
Surface Resistance :
2 coats @4.2 mil
Surface Resistance :
3 coats @6.1 mil
Magnetic Class
Relative Permeability
Shielding Attenuation for 51
m
[2.0 mil]
Shielding Attenuation
>10 to 100 kHz
Shielding Attenuation
>100 kHz to 1 MHz
Shielding Attenuation
>1 MHz to 10 MHz
Shielding Attenuation
>10 MHz to 100 MHz
Shielding Attenuation
>100 MHz to 1 GHz
Shielding Attenuation
>1 GHz to 10 GHz
Shielding Attenuation
>10 GHz to 18 GHz
Method
Method 5011.5
in MIL-STD-883H
Square probe
Square probe
Square probe
IEEE STD 299-1997
"
"
"
"
"
"
"
Value
0.0076
cm
Resistance
a)
0.62
/sq
0.38
/sq
0.34
/sq
Ferromagnetic
≥100
84
65
39
32
52
56
49
dB
dB
dB
dB
dB
dB
dB
to
to
to
to
to
to
to
89
88
60
52
61
74
68
dB
dB
dB
dB
dB
dB
dB
130 S/cm
Conductance
a)
1.6 S
2.6 S
2.9 S
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Super Shield
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Nickel Conductive Coating
841AR Technical Data Sheet
841AR-Aerosol
Physical Properties
Paint Type
Color
Abrasion Resistant
Blister Resistant
Peeling Resistant
Water Resistant
Mechanical Properties
Adhesion
b)
Pencil Hardness
b)
Environmental & Ageing Study
Salt Fog Test @35 °C [95 °F], 96 h
SalResistivity
before
SalResistivity
after
Sal%
Conductivity after
Cross-Hatch Adhesion
Cracking, unwashed area
Visual Color, unwashed area
Method
—
Visual
—
—
—
—
Method
ASTM D3359
ASTM D3363
Method
ASTM B117-2011
MG-ELEC-120
"
"
ASTM D3359-2009
ASTM D661-93
ASTM D1729-96
Value
Lacquer (Thermoplastic)
Dark grey
Yes
Yes
Yes
Yes
Value
5B
HB, soft
Value
380 msq
510 msq
75%
5B
None
Slightly darker
b)
a) Surface resistance is given in
sq
and the corresponding conductance in Siemens (S or
-1
b) Tested using HVLP spray gun application on acrylonitrile butadiene styrene (ABS) coupons
The coating surface resistance and attenuation are plotted in Figures 1 and 2.
Surface Resistance by Coating Thickness
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.5
2.5
3.5
4.5
5.5
6.5
Surface Resistance (Ω/sq)
Thickness (mil)
Figure 1.
Nickel conductive coating surface resistance at different thicknesses (the dots indicate typical
successive coat thicknesses)
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Super Shield
TM
Nickel Conductive Coating
841AR Technical Data Sheet
841AR-Aerosol
Shielding Attenuation
Aluminum Panel
120
841AR
Blank
100
Attenuation (dB)
80
60
40
20
0
0.01
0.1
1
10
100
1000
10000
100000
Frequency (MHz)
Figure 2.
Attenuation of 841AR coating at different frequencies
Properties of Uncured 841AR
Physical Properties
Color
Density @25 °C [77 °F]
Solids Percentage (wt/wt)
Viscosity @25 °C [77 °F]
a)
Flash Point
Odor
a) Brookfield viscometer at 60 RPM with spindle LV S61
Mixture
Dark grey
1.3 g/mL
38%
61 cP [45 mm
2
/s]
-17 °C [1.4 °F]
Ethereal
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Super Shield
TM
Nickel Conductive Coating
841AR Technical Data Sheet
841AR-Aerosol
Compatibility
Chemical—Nickel
has good resistance to oxidation in a variety of corrosive environments, including
marine environments. In normal atmosphere or freshwater, nickel typically corrodes less than 0.0025 mm
per year. Since nickel forms a passive protective film on its surface that slows down or stops further
corrosion, the passive nickel resists corrosion better than pure copper fillers. In addition, nickel is harder
than its silver or copper filled counterparts, helping provide greater durability.
The thermoplastic acrylic resin is incompatible common paint solvents like toluene, xylene, acetone, and
MEK. Further, it will not withstand chronic exposures to engine oils, fuels and other similar hydrocarbons.
While this makes the coating unsuitable for solvent rich environments, it does offers great repair and
rework characteristics.
Adhesion—The
841AR coating adheres to ABS, PBT, and most materials found on printed circuit
assemblies; however, it is not compatible with contaminants like water, oil, and greasy flux residues that
may affect adhesion. If contamination is present, clean the surface to be coated first.
841AR Adherence Compatibility
Substrate
Acrylonitrile Butadiene Styrene (ABS)
Polybutlylene Terephtalate (PBT)
Polycarbonate
Polyvinyl Acetate (PVA)
Polyvinyl Chloride (PVC)
Polyamide (Nylon 6^6)
Acrylics or Acrylic Paints
Epoxy, FR4 substrate
Polyurethane
Wood
Note
Chemically etches
a)
and adheres well to this substrate.
"
"
"
"
"
Adheres well to clean surface
"
Adheres well to clean surface for most urethane types
Adheres well with surface preparation
a) Etching is similar to sanding, except that it also softens the surface helping to meld the paint to the
plastic for superior adhesion.
A
TTENTION
!
Do not use on thin plastics or on plastics where you want to keep original surface intact.
The 841AR spray contains a controlled amount of solvents designed to chemically etch plastic surfaces to
help adhesion by melding the acrylic coating into the plastic substrate. This prevents flaking or peeling.
Using the 4351-1L thinner lessens the etching effects for chemically sensitive substrates.
Storage
Store between -5 and 40 °C [23 and 104 °F] in dry area away from sunlight. Temperatures below or
above these outer limits will result in the container being crushed and/or ruptured.
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