SPI Carbon Paint
General information for applications outside of electron microscopy
The SPI Carbon Paint product is designed to provide controlled electrical
properties to an otherwise nonconductive surface.
The SPI Carbon Paint product is designed to provide high lubricity,
conductivity, and excellent release properties to many nonconductive
substrates, including most plastics. It is made from a dispersion of
colloidal graphite in an isopropanol solution which will quickly air dry on
literally any surface to form a thin uniform adherent layer. It has been
formulated in a way that the drying product will resist "skin formation",
which should result in a dry top layer with a still wet region underneath.
Such dry skin/residual wet regions, although the wet regions do eventually
dry, can result in a layer of assymetric properties and characteristics.
- Printed Circuits
- Vacuum Tubes
- Bleed Paths
- Low Noise Communication Cables
- High Resistance Coating on Plastics
- Static Bleed
- Impregnation of fibers and paper
- Analytical instrumentation applications (e.g. SEM/EDS)
Physical Properties (as supplied suspension):
Binder/thickener:|| cellulosic resin|
Diluent:|| SPI Carbon Paint Thinner or isopropanol|
Density:|| 7.4 lbs/gal (0.888 kg/l)|
Weight % solids:|| 20%|
Volume % solids:|| 14%|
Flash point:|| 52° F/ 11°C|
Shelf life:|| 6 months from date of original shipment, unopened|
Coverage:|| 225 ft2/gal @ 1 mil (5.524 m2/l)|
VOC:|| 710 g/l (5.9 lb/gal)|
Typical Properties (Cured Coating):
Color:|| matte black|
Coefficient of friction:|| 0.15 (static)|
Service temperature:|| 150° F/ 65°C|
Sheet resistance:|| 1.2 K ohms/sq @ 1 mil (25µm) dry film thickness|
Electrical Properties of Cured Coating
The electrical properties of the final cured coating can be controlled by
changing the film thickness as shown below:
Method of Use:
Substrates to be coated must be clean and dry. A solvent wipe with air dry
is usually sufficient for smooth surfaces. For porous surfaces, use the
same procedure follow by heating to drive off entrapped contaminants,
solvents or moisture.
Mixing and Application:
SPI Supplies Carbon Paint is supplied in concentrated form. It is
thixotropic in nature and will gel upon standing. Preparation involves
thorough agitation of the concentrate, then dilution with isopropanol or
SPI Supplies Carbon Paint Thinner.
The product can be applied by brush, dip, roller or spray.
Always agitate thoroughly just prior to use.
A coating thickness of 1 mil (25 µm) is best built up by the application of
five separate coats at 0.2 mil (5 µm) thickness by spray application.
Dilution of 1 part by volume of product with 3 parts by volume of thinner is
necessary to obtain an adherent coating of this thickness.
For small production work and prototypes, a suction cup gun may be used,
providing the carbon paint is thoroughly mixed before spray application.
For immediate production runs or a lot of small parts, propeller-type
attachments should be used on the suction gun to ensure coating uniformity.
Full production is best handled with propeller-agitated pressure pot systems
as this provides the best in application efficiency.
To reduce overspray, use the minimum atomization pressure required for
The coating air dries to the touch in 5 minutes and is ready to use in 30
minutes. Following the air dry, bake for 5 minutes at 167° F/ 75°C to
achieve optimum coating qualities in a shorter curing time.
Be familiar with the MSDS information.
SPI Carbon Paint is a trade name Structure Probe, Inc., West Chester, PA 19381 USA
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