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We use the following types
of conformal coating at Arizona ProCoat LLC. Understanding the general
characteristics of the common types used in the industry will allow you
to make the best choice for your application.
Standards used by the
industry are IPC-CC-830, Mil-I-46058C, Mil-P-28809 and UL746C.
We are proud to use Humiseal, Dextor Hysol, and Miller-Stephenson
products.
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Acrylic (Type AR)
The common characteristics of acrylic-type coating include:
 It dries at room temperature in
minutes
It has desirable electrical and
physical properties
It is fungus resistant
It has a long pot life
It also has a low or no exotherm
during cure, which prevents damage to heat-sensitive components
It is easy to remove
Dielectric withstands > 1500
volts
Its temperature range is –59°C
to 132°C.
Polyurethane (Type UR)
The common characteristics of polyurethane-type coating include:
It is available in one-part,
two-part, UV-curable and water-borne systems
It provides excellent humidity
and chemical resistance, with outstanding dielectric properties for extended
periods
It is difficult to apply and
remove
Rework can be completed on small
areas by burning through the coating with a soldering iron
It requires extended curing
time, or baking in a recirculating oven
Its temperature range is –59°C
to 132°C.
Silicone (Type SR)
The common characteristics of silicone-type coating include:
It is useful for
high-temperature requirements, typically to 200°C
It provides high humidity and
corrosion resistance, with good thermal endurance for high heat-dissipating
components
It is susceptible to abrasion
and has a high coefficient of thermal expansion
It is available in 100% solids
heat-curing liquids, 100% solids moisture-curing liquids, 100% solids
UV-curable liquids, and solvent-borne reactive coating
Rework can be completed when
chemical strippers are used for coating removal
Its temperature range is –65°C
to 200°C.
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