Liquid Coatings— 23 / 07 / 2021
Written by Marketing Manager Emily Waterhouse 07/23/2021
We talk a lot about Parylene on here and that’s great. She’s the star of the show. But sometimes you need to shine the spot light on the supporting cast. Today we are going to talk about our liquid coatings.
Now these aren’t your typical liquids. I’m talking acrylic, epoxy, urethane, and silicone. Each one of these liquid coatings have different benefits, depending on what you want it to do protection wise. Let’s start with acrylic.
Acrylic Conformal Coating
Acrylic is maybe one the most popular coating materials there is because of their easy application and removal, plus its forgiving nature.
They dry fast, are fungus resistant, and have a moderate dielectric constant. They also give off little or no heat during the curing process, eliminating the potential damage to heat-sensitive components. They don’t shrink during curing either and have great humidity resistance.
Acrylic coating protect electric circuits against moisture, dirt, dust, thermal shocks, and scratches that can corrode, short circuit, or damage the electric component. It insulates against high-voltage arcing, shorts, and static discharges.
Learn more about our Acrylic coating here!
Epoxy Resin Conformal Coating
Our epoxy resins is usually a two-part compound that start curing during mixing. But we also have single part coating that can be cured thermally or with UV exposure.
Epoxy resins exhibit good abrasive and chemical resistance, and decent humidity resistance. This coating is virtually impossible to remove and rework. It requires burning through it with a soldering iron. A buffer is recommended around delicate components, since a film shrinkage happens. The shrinkage can be minimized by curing it at a low temperature. This particular resin can be applied by a brush, spray, or dip-coating.
Learn more about our Epoxy resin coating here!
Urethane is actually called Polyurethane. But we’re going to stick with Urethane. We offer these coatings in single or two-component forms, just like Epoxy. Either form provides excellent humidity resistance.
Now if you want your component to be extremely chemical resistant, pick urethane over acrylic.
Our single component urethanes, while super easy to apply, they sometimes require a very lengthy curing cycle.
Our two component urethane can be cured in 1-3 hours with the help of heat. But, when compared to single component formulations, two-component formulas can have a relatively short pot life sometimes making them hard to work with.
Removal of urethane coatings can be difficult because of their high resistance to solvents. It is possible though.
Learn more here.
Last, but not least, Silicone
Silicone is transparent, soft, and flexible which means it offers moisture, corrosion and humidity resistance. And it also provides good chemical resistance, salt spray resistance and is very flexible. It functions great in high temperate applications and is resistant to UV light and dirt pick-up. But, silicones are not solvent dissolvable and require chemical strippers for removal or repairs.
Learn some more about Silicone here.
Hopefully this helps you in deciding what type of coating you need and as always if you need help or have questions contact us!