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Acrylic Coatings

Mil-Spec Type AR Coating

Acrylic coatings are generally a fast drying, single component, conformal coating that provide excellent moisture and environmental protection for printed circuit assemblies. The cured film demonstrates exceptional flexibility and fluoresces under UV light for ease of inspection and is easily repaired.

Acrylics are fairly inexpensive. The substrate must be very clean for the successful application of any conformal coating. Surfaces must be free of moisture, dirt, wax, grease, flux residues and all other contaminants. Contamination under the coating could cause problems that may lead to assembly failures.

Acrylic Coatings can be Dipped, Sprayed or Brushed. They viscosity can be adjusted with thinning agents using the manufacturers specifications.

Typical Specifications of Acrylic Coatings

Note: products can vary greatly form product to product and manufacturer to manufacturer

Density, per ASTM, Meth. D1475 0.95 ± 0.03 g/cm³
Solids Content, % by weight per Fed-Std-141, Meth. 4044 28 ± 3 %
Viscosity, per Fed-Std-141, Meth. 4287 325 ± 60 centipoise
VOC 684 grams/litre
Drying Time to Handle per Fed-Std-141, Meth. 4061 30 minutes
Recommended Coating Thickness 25 – 75 microns
Recommended Curing Conditions 24 hrs @ RT or 30 min @ 76°C
Time Required to Reach Optimum Properties 7 days
Shelf Life at Room Temperature, DOM 24 months
Thermal Shock, 50 cycles per MIL-I-46058C -65°C to 125°C
Coefficient of Thermal Expansion – TMA 170 ppm/°C below Tg340 ppm/°C above Tg
Glass Transition Temperature – DSC 14°C
Modulus – DMA 2000 MPa@ -40°C1050 MPa@ 20°C8.5 MPa@ 60°C
Flammability, per MIL-I-46058C Self-Extinguishing
Dielectric Withstand Voltage, per MIL-I-46058C >1500 volts
Dielectric Breakdown Voltage, per ASTM D149 6300 volts
Dielectric Constant, at 1MHz and 25°C, per ASTM D150-98 2.6
Dissipation Factor, at 1MHz and 25°C, per ASTM D150-98 0.01
Insulation Resistance, per MIL-I-46058C 5.5 x 1012 ohms (550TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 7.0 x 1010 ohms (70GΩ)
Fungus Resistance, per ASTM G21 Passes