Conformal Coatings

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Summary

All electronic components on the satellite will likely need a conformal coating to protect them from vibrations and the harsh environment that is space. This guide was pulled from [techni-tool.com] and explains the different types of conformal coatings and their abbreviations.

Types of Conformal Coatings

Acrylic - AR

Acrylic conformal coatings provide fair elasticity and general protection. As one‐part systems, they are easy to apply and remove. Acrylic conformal coatings are recognized for their high dielectric strength, abrasion resistance and ease of removal.

Silicone - SR

Silicone conformal coatings provide excellent protection in a very wide temperature range. They provide good chemical resistance, salt spray resistance and are very flexible. Removal can be challenging, requiring specialized solvents and long soak time.

Polyurethane - UR

Polyurethane conformal coatings are known for their excellent moisture and chemical resistance. They are also very abrasion resistant. Due to this and their solvent resistance, they are also very difficult to remove.

Epoxy - EP

Epoxy systems are usually available as two‐part compounds. These conformal coatings provide good humidity resistance, high abrasion and chemical resistance. Typically, they are very difficult to remove once they are cured, and are not as flexible as the other materials.

Parylene - XY

Parylene conformal coatings are a unique type of coating applied through vapor phase deposition. They provide excellent dielectric strength and superior resistance to solvents and extreme temperatures. Because of the vapor deposition method, parylene can be applied very thin and still provide excellent circuit board protection. Removal for rework is very difficult, requiring abrasion techniques, and without access to vapor phase deposition equipment, recoating with parylene is impossible.

Conformal Coating Selection

From this list, the silicone conformal coating will likely be the best option for our components as they provide a wide range of protection from temperatures and thermal shock.

Furthermore, a requirement for Outgassing must be considered. A good conformal coating based on the discussion here and the outgassing requirements is this product.