838AR Liquid Datasheet by MG Chemicals

View All Related Products | Download PDF Datasheet
mm... sank _ TOTAL GROUND 7 (Anon tonoucnvs nun mum: III (An-nu: V mnucrzun 838M! . Plllllll connumvn MAL GROIHW n: mum mm mama": mm mm connunm mur‘unflgwm an autumn ,mumwmu unnu “mu“ 9? muum ,. mm (oInIqu mum-u mm: mm
ISO 9001:2015 Quality Management System. Burlington, Ontario, Canada SAI Global File: 004008 07 January 2021 / Ver. 4.8
838AR Liquid
1
Total GroundTM
Carbon Conductive Paint
838AR is an economical conductive paint that
consists of a 1-part, solvent-based acrylic lacquer,
pigmented with highly conductive carbon powder. It
is smooth, durable, 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 strong corrosion resistance and
is suitable for use in marine environments.
838AR is excellent for creating grounded surfaces and
in low frequency RFI shielding applications, such as
pickup cavities on electric guitars. It is also perfect for
shielding metal detectors and other devices where a
metal-filled conductive paint would cause malfunction.
Cured Properties
Resistivity 6.3 x 10-1 Ω·cm
Surface Resistance @ 50 µm 100 Ω/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 20 016 cm2/L
(based on 100% transfer efficiency)
Uncured Properties
Viscosity @ 25 ˚C 114 c P
Density 0.89 g/mL
Percent Solids 15 %
Shelf Life 3 y
Calculated VOC 519 g/L
Features & Benefits
• Provides >52 dB of RFI shielding at
frequencies <1 MHz
• Quick dry time, no heat cure required, and
easy to apply
• Strong corrosion resistance
• Mild solvent system, safe on polystyrenes
• Does not contain toluene, xylene, or MEK
• Also available in aerosol (838AR-340G) and
pen (838AR-P) formats, see separate TDSs
Available Packaging
Cat. No. Packaging Net Vol. Net Wt.
838AR-15ML Jar 12 mL 10.6 g
838AR-900ML Can 850 mL 755 g
838AR-3.78L Can 3.60 L 3.20 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
Chemicals Sim: lmsunce (Kl/w) Shielding Attenuation Amnnalieflklfl)
ISO 9001:2015 Quality Management System. Burlington, Ontario, Canada SAI Global File: 004008 07 January 2021 / Ver. 4.8
838AR 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 5–15 psi 5–15 psi
Air flow 10–15 SCFM 8.3 SCFM
Air cap 5–10 psi 5–10 psi
When using a pressure pot and agitator, keep the
agitator at low mixing speed with air pressure of
20–50 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 10 00 10000 10 00 00
Attenuation (dB)
Frequency (MHz)
Al uminum P ane l 838AR Blank
Surface Resistance by Paint Thickness
50
70
90
110
130
150
170
190
210
230
250
270
290
310
330
350
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
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 mm–1.4 mm diameter and 5–10 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.