Super Shield
TM
Silver Conductive Coating
842 Technical Data Sheet
842-Aerosol
Description
The 842
Silver Conductive Coating
is a one-part durable acrylic lacquer pigmented with an extremely
conductive silver 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 good adhesion
to plastics, extreme conductivity, very strong high frequency shielding, and extreme corrosion resistance,
even in harsh marine environments.
Applications & Usages
The 842 is designed to provide a conductive coating to the interior of plastic electronic enclosures to
suppress EMI/RFI emissions. It excels when the highest level of shielding is required.
It is optimal for military, medical, or other mission critical applications where the highest levels of
attenuation are essential.
The 842 is commonly used by manufacturers of these devices:
Medical Equipment
Military equipment
Scientific equipment
Test Equipment
Communication devices
Cellphones, laptops, PDA’s
Consumer electronics
Automotive applications
Aerospace applications
Drones and other RC vehicles
Providing electric continuity for circuits
Circuit repair
Other applications for 842 include:
Repairing damage to existing shielding
Conductive undercoat for electroplating
It is a simple effective solution to impart maximum conductivity to a surface.
Benefits and Features
Meets MIL-STD-883H
Provides extreme EMI/RFI shielding over a broad frequency range
Volume resistivity of 0.0002
cm
Smooth, durable, and abrasion resistant
Available in liquid format
Quick dry time, no heat cure required
Strong adhesion to acrylic, ABS, polycarbonate, and other injection molded plastics
Excellent adhesion to wood, ceramics, copper, and aluminum
Extremely corrosion resistant, suitable for harsh marine environments
ENVIRONMENT
Meets RoHS directive
Low-VOC
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Rev. Date: 13 September 2016 / Ver. 3.00
Super Shield
TM
Silver Conductive Coating
842 Technical Data Sheet
842-Aerosol
Usage Parameters
Properties
Dry to Touch (liquid)
Recoat time (liquid)
Drying Time @25 °C [77 °F]
Drying Time @65 °C [149 °F]
Shelf Life
Theoretical 340G Spray
Can Coverage
a)
Value
3 to 5 min
2 min
24 h
30 min
1y
≤2 660 cm
2
≤400 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
Silver
Acrylic Resin
Acetone
Ethanol
Toluene
CAS Number
7440-22-4
9003-01-4
67-64-1
64-17-5
108-88-3
Properties of Cured 842
Electric & Magnetic Properties
Volume Resistivity
Surface Resistance
Surface Resistance
1 coat @1 mil
Surface Resistance
2 coats @2 mil
Surface Resistance
2.5 coats @2.5 mil
Magnetic Class
Relative Permeability
Shielding Attenuation
b)
for 50
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
0.0002
cm
5 000 S/cm
Resistance
a)
Conductance
a)
0.065
sq
15 S
0.055
sq
18 S
0.040
sq
25 S
Diamagnetic (Non-magnetic)
<1.0
79
81
52
52
72
66
66
dB
dB
dB
dB
dB
dB
dB
to
to
to
to
to
to
to
88
90
81
77
85
85
81
dB
dB
dB
dB
dB
dB
dB
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Rev. Date: 13 September 2016 / Ver. 3.00
Super Shield
TM
Silver Conductive Coating
842 Technical Data Sheet
842-Aerosol
Physical Properties
Paint Type
Color
Abrasion Resistant
Blister Resistant
Peeling Resistant
Water Resistant
Environmental & Ageing Study
Salt Spray Test: 7 day @35 °C +Salt/Fog
Cross-hatch Adhesion
Cracking, unwashed area
Visual Color, unwashed area
Peeling, unwashed area
Method
—
Visual
—
—
—
—
Method
ASTM B117-2011
ASTM D3359-2009
ASTM D661-93
ASTM D1729-96
ASTM D1729-96
Value
Lacquer (thermoplastic)
Light brown
Yes
Yes
Yes
Yes
Value
5B = 0% area removed
None
Severe yellowing & discoloration
None
Note:
The first coat thickness is typically around 25
m
[1.0 mil].
a) Surface resistance is given in
sq
and the corresponding conductance in Siemens (S or
-1
b) Minimum and Maximum value for range as determined by external testing by an independent
laboratory.
Surface Resistance by Coating Thickness
0.07
Sheet Resistance (/sq)
0.06
0.05
0.04
0.03
1
1.2
1.4
1.6
1.8
Thickness (mil)
Figure 1.
Silver coating surface resistance at different thicknesses
2
2.2
2.4
2.6
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Rev. Date: 13 September 2016 / Ver. 3.00
Super Shield
TM
Silver Conductive Coating
842 Technical Data Sheet
842-Aerosol
Properties of Uncured 842
Physical Property
Color
Density @25 °C
Solids Percentage (wt/wt)
Flash Point
Odor
Mixture
Silver Grey
2.15 g/mL
19%
-16 °C [3.2 °F]
Ethereal, benzene-like
a)
a) Percentage for liquid only (before thinning)
Compatibility
Chemical—The
silver filler is quite resistant to oxidation, except in environments that contain
contaminants like H
2
S or ozone which tarnish its surface.
The thermoplastic resin is dissolved by common paint solvents like toluene, xylene, acetone, and MEK.
This allows great coating repair and work characteristics, but it does make the coating unsuitable for
solvent rich environments.
Adhesion—The
842 coating adheres to most plastics used to house 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.
842 Adherence Compatibility
Substrate
Acrylonitrile Butadiene Styrene (ABS)
Polybutlylene Terephtalate (PBT)
Polycarbonate
Polyvinyl Acetate (PVA)
Acrylics or Acrylic Paints
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
!
Use with care on thin plastics or on plastics where you want to keep original surface intact.
The 842 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.
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Rev. Date: 13 September 2016 / Ver. 3.00
Super Shield
TM
Silver Conductive Coating
842 Technical Data Sheet
842-Aerosol
Storage
Store between -5 and 40 °C [23 and 104 °F] in dry area.
Health, Safety, and Environmental Awareness
Please see the 842
Safety Data Sheet
(SDS) for greater details on transportation, storage, handling and
other security guidelines.
Environmental Impact:
The regulated volatile organic content is 9.5% (134 g/L) by EPA and WHMIS
standards.
This product meets the European Directive
2011/65/EU Annex II (ROHS);
recasting 2002/95/EC.
Health and Safety:
The solvents in 842 can ignite if exposed to flames or sparks and can cause
respiratory track irritation. If ignited, then flame flash back is possible. Use in well-ventilated area.
Solvents can cause skin irritation and have some reproductive effects. Wear safety glasses or goggles and
disposable gloves to avoid exposures.
HMIS® RATING
HEALTH:
FLAMMABILITY:
PHYSICAL HAZARD:
PERSONAL PROTECTION:
Approximate HMIS and NFPA Risk Ratings Legend:
0 (Low or none); 1 (Slight); 2 (Moderate); 3 (Serious); 4 (Severe)
NFPA® 704 CODES
* 2
3
0
3
2
0
Aerosol Application Instructions
For best results, apply thin wet coats as opposed to using thick coats. We recommend a final dry film
thickness of at least 1.0 mil [25
m].
Follow the procedure below for ensure optimal conductivity.
Prerequisites
Clean and dry the surface of the substrate to remove
Oil, dust, water, solvents, and other contaminants
Material & Equipment
Personal protection equipment (See 842-Aerosol SDS)
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Rev. Date: 13 September 2016 / Ver. 3.00
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