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Conformal Coating(MAC 25)

Conformal Coating(MAC 25)
Conformal Coating(MAC 25)
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Product Code : 25
Product Description

Technical Data Sheet

MAC 25 is a fast air drying, single component modified acrylic coating for protection of printed circuit board assemblies from harsh environmental factors like moisture, dust, corrosion, fungus and thermal shock. The high Dielectric strength of the coating prevents high voltage arcing and corona effect. It protects and insulates electrical and electronic components and assemblies including control panels, solenoid coils, generators, motors and transformers. Its good adhesion property allows it to be applied on a variety of substrates like metals, ceramics, plastics etc.

MAC 25 does not contain any CFC's and is RoHS compliant.

Test Standard
Properties of Liquid MAC 25

Light straw

ASTM D 1824 15 - 20 cps
ASTM D 1475 0.8 - 1.0 gm/cc
Flash point
IS: 10026 <9oC
Solids content
ASTM D 3960 22 + 3%
ASTM D 3960 700 gm/Ltr
Coverage at 20 μn
Calculated 60
Recommended coating thickness

25 - 60μn
Properties of cured MAC 25
Physical Properties:

Continuous use operating range
-65oC to +125oC
Thermal shock
ASTM D 635
Self extinguishing

Weather resistance

Electrical Properties:
Dielectric withstand Voltage
Leakage current @1500V
1.1 μA
Insulation resistance
2.39x1013 Ω
Moisture resistance
4.2x1012 Ω
Dielectric strength
ASTM D 149
90 KV/mm
Surface resistivity
IEC 60093
1.3 x 1016 Ω
Volume resistivity
IEC 60093
3.0 x 1015 Ω-cm
Dielectric constant at 50Hz
ASTM D 150
Dissipation factor at 50Hz
ASTM D 150
Chemical Properties:


Fungus resistance rating
Resistance to chemicals


Directions For Use:
Surface to be coated should be thoroughly cleaned prior to coating in order to ensure that satisfactory adhesion to the substrate is achieved. It should be free of moisture, flux residues, dirt, wax, grease, oil and other contaminants. Contamination under the coating may become corrosive and lead to assembly failure.

MAC 25 can be applied by spraying, brushing or dip coating. The liquid is in ready to use condition. However, over a period of extended time, viscosity change can occur due to solvent evaporation. In such a case, the viscosity can be adjusted by addition of Xylene. The thickness and uniformity of the coating depends on the operator's technique and must be determined by trials with the method concerned.

Spraying - Bulk: MAC 25 is suitable for use in manual spray guns as well as selective coating equipment.

Spraying - Aerosol: The can should be held at an angle of not more than 45o from the vertical and at a distance of 20 to 25 cm from the substrate to be coated.

Brushing: Use a brush having soft nylon bristles. Care must be taken not to re-apply on partially cured surface in order to avoid bristle marks.

Dip coating: The board assemblies should be immersed in the dipping tank in the vertical position for approximately 10 seconds and then withdrawn at a suitable rate (to be determined by trials) to ensure that an even film covers the entire surface.

Curing Process: The coating will air dry tack free in 10 to 15 minutes, curing fully in 24 hours. The curing time can be accelerated by curing at room temperature for 2 hours followed by curing in an air circulating oven @60oC for 1 hour. This process will also ensure that maximum coating properties are achieved.

Inspection: MAC 25 fluoresces under UV light which allows inspection of the PCB after coating to ensure complete coverage.

Repair: The cured coating may be removed by soaking and cleaning with acetone or toluene. Component replacement may be accomplished by localized desoldering/soldering directly through the coating. Re-apply the coating on the repaired area.

Packing & Shelf Life:

Shelf Life
5/10/20 Ltr
12 months
500 ml
24 months

Handling & Storage: Keep the product away from fire and heat as the solvents in MAC 25 are flammable. Avoid contact with eyes and skin. Avoid inhalation of vapors. Use only in well ventilated areas. Store in a cool, dry room at room temperature in tightly closed container. Keep away from fire and heat. Refer to MSDS before use.

The information contained herein is offered in good faith and is believed to be accurate. However, because conditions and methods of use of the product are beyond our control, this information should not be used as a substitute for customer's tests to ensure that our products are safe, effective and fully satisfactory for the intended end use. Our sole warranty is that the product will meet the sales specifications in effect at the time of shipment.

Micro Cad Services

#865, 7th Main, 3rd Cross, Hal 2nd Stage, Indira Nagar, Bengaluru - 560008, Karnataka, India
Phone :+918068091074
Fax :91-80-25202911
Mr. Praveen Kumar M.C. (Business Head)
Mobile :+918068091074

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