MAC 25 is an air drying; room temperature curing, 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.

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 Thinner/Stripper 'CTS 05'. 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 45° from the vertical and at a distance of 20 to 25 cm from the surface 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board assemblies should be immersed in the dipping tank in the vertical position for approximately 10 seconds and then withdrawn at a suitable rate (to be determined by trials) to ensure that an even film covers the entire surface.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 @60°C for 1 hour. This process will also ensure that maximum coating properties are achieved.

Inspection: MAC 25fluoresces 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 Thinner/Stripper 'CTS 05'. Component replacement may be accomplished by localized desoldering/soldering directly through the coating. Re-apply the coating on the repaired area.