PCB Coating Services for Moisture, Corrosion & Environmental Protection

Liquid-free parylene coatings provide the ultimate level of protection for electronics that will encounter extreme environmental conditions such as extended exposure to moisture or harsh chemicals.  Parylene coatings are applied in a unique batch process at room temperature using a chemical vapor deposition (CVD) process.

Acrylic conformal coatings are liquid conformal coatings that often require use of solvents.  Acrylics are easy to rework but have poor chemical resistance.  They excel on printed circuit boards for moisture protection.  However, in applications with possible exposure to solvents, acrylic conformal coatings do not provide the best protection.

Fluoropolymer coatings are typically ultra thin, which make them easy to remove.  These conformal coatings have good resistance to oils, acids, solvents, and water.  Boards that have been coated with a fluoropolymer conformal coating are hydrophobic.

Epoxy-based coatings are usually two-part systems with limited pot life.  Similar to polyurethanes, they provide good moisture an chemical resistance.  A major downfall is that they are almost impossible to remove chemically for rework.

Polyurethane conformal coatings come as single-component, two-component, UV-curable, and water-borne systems. Although polyurethanes provide good chemical and moisture resistance, they are often hard to rework and have low tolerance in humid environments. 

Silicones are often used for very high- to low-temperature environments.  They provide high humidity and corrosion resistance along with good thermal endurance but require thermal curing and have short pot lives.  Silicone coatings are also prone to abrasion (low cohesive strength) and have high coefficients of thermal expansion.