842AR Liquid Datasheet by MG Chemicals

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ISO 9001:2015 Quality Management System. Burlington, Ontario, Canada SAI Global File: 004008 06 January 2021 / Ver. 4.8
842AR Liquid
1
Super ShieldTM
Silver Conductive Paint
842AR is a conductive paint that consists of a 1-part,
solvent-based acrylic lacquer, pigmented with an
extremely conductive silver flake. It is smooth, hard, and
abrasion resistant. It can be easily applied by brush or
spray. It has a quick dry time, with no heat cure necessary.
It adheres strongly to most injection-molded plastics, such
as ABS, PBT and PVA. It provides superior high frequency
shielding. It also provides strong corrosion resistance, and
is suitable for use in marine environments.
842AR is designed to provide a conductive coating for the
interior of plastic electronic enclosures that suppresses
EMI/RFI emissions. It excels when the highest level of
shielding is required. Also, its thin minimum layer height
makes it suitable for board level applications.
Features & Benefits
Provides superior EMI/RFI shielding over a
broad frequency range
Strong corrosion resistance
Mild solvent system, safe on polystyrenes
Does not contain toluene, xylene, or MEK
Also available in aerosol (842AR-340G) and
pen (842AR-P) formats, see separate TDSs
Available Packaging
Cat. No. Packaging Net Vol. Net Wt.
842AR-15ML Jar 12 mL 20.8 g
842AR-150ML Can 150 mL 260 g
842AR-900ML Can 850 mL 1.47 kg
842AR-3.78L Can 3.60 L 6.25 kg
Contact Information
MG Chemicals, 1210 Corporate Drive
Burlington, Ontario, Canada L7L 5R6
Email: support@mgchemicals.com
Phone: North America: +(1)800-340-0772
International: +(1) 905-331-1396
Europe: +(44)1663 362888
Cured Properties
Resistivity 1.0 x 10-4 Ω·cm
Surface Resistance @ 50 µm 0.015 /sq
Salt fog @ 35 °C [95 °F], 96 h Excellent
Service Temperature Range -40 120 ˚C
Usage Parameters
Recoat Time 3 min
Cure Times 24 h @ 22 ˚C
30 min @ 65 ˚C
Recommended Film Thickness 50 µm
Minimum Film Thickness 25 µm
Theoretical Coverage @ 2 mil 46 000 cm2/L
(based on 100% transfer efficiency)
Uncured Properties
Viscosity @ 25 ˚C 873 cP
Density 1.70 g/mL
Percent Solids 61 %
Shelf Life 5 y
Calculated VOC 206 g/L
Chemicals surface Resists nce [n/Sq) Shielding Attenuation Amnuztmntdfli
ISO 9001:2015 Quality Management System. Burlington, Ontario, Canada SAI Global File: 004008 06 January 2021 / Ver. 4.8
842AR Liquid
2
Application Instructions
Read the product SDS and Application Guide for
more detailed instructions before using this product
(downloadable at www.mgchemicals.com).
Recommended Preparation
Clean the substrate with Isopropyl Alcohol, MG #824,
so the surface is free of oils, dust, and other residues.
Recommended Thinner
When applying to polycarbonate or ABS, thin with MG
#4351 Thinner 1. For other substrates, use MG #435
Thinner.
Brush
Thinning is not required for most brush applications.
Manual Spray Guns
Dilute 2-parts paint with 1-part thinner. Use a standard
fluid nozzle gun to spray the diluted paint. The
settings listed below are recommendations; however,
performance will vary with different brands:
LVMP HVLP
Nozzle tip diameter 1.2–1.4 mm 1.2–1.4 mm
Inlet pressure 515 psi 515 psi
Air flow 1015 SCFM 8.3 SCFM
Air cap 510 psi 510 psi
When using a pressure pot and agitator, keep the
agitator at low mixing speed with air pressure of
2050 psi. Use the lowest pressure necessary to
keep the particles suspended.
Shielding Attenuation
0
20
40
60
80
100
120
0.01 0. 1 110 100 1000 1000 0 1000 00
Attenuation (dB)
Frequency (MHz)
Al umi num Pane l 842AR Blank
Surface Resistance by Paint Thickness
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3
Surface Resistance (Ω/sq)
Thickness (mil)
Selective Coating
For higher volume applications, paint can be
applied via selective coating equipment. Use a
system with constant fluid recirculation to keep the
particles from settling in the lines. A fluid nozzle
ranging from 1.2 mm1.4 mm diameter and 510 psi
fluid pressure is recommended depending on nozzle
size. Thin the paint to adjust the viscosity to the level
appropriate for the valve being used.
Cure Instructions
Allow to dry at room temperature for 24 hours, or after
letting sit for 3 minutes, cure the paint in an oven for
30 minutes @ 65 ˚C.
Clean-up
Clean spray system and equipment with MEK or
acetone, MG # 434.
Storage and Handling
Store between -5 and 40 ˚C in a dry area, away from
sunlight (see SDS).
Disclaimer
This information is believed to be accurate. It is
intended for professional end-users who have the
skills required to evaluate and use the data properly.
M.G. Chemicals Ltd. does not guarantee the accuracy
of the data and assumes no liability in connection with
damages incurred while using it.
Test performed with a two-coat thickness.

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