Conformal Coating

Amorphous Fluoropolymer Conformal Coatings

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.

Strengths

• Low Dielectric Content
• High Glass Transition Temperature
• Low Surface Energy
• Low Water Absorption
• Good Solvent & Oil Resistance
• Common Acid Resistance

Weaknesses of Cure Type

Solution Deposition

• Requires special liquids for polymer swelling
• Limited solubility which limits film thickness
• May require glass temperature anneal
• Requires special surface treatment for greatest adhesion
• Poor resistance to some acids and alkalines

Vacuum Deposition

• Requires pressure of 10 Torr ' 5 Torr [0.193 PSI ' 0.097 PSI] or less
• May require glass temperature anneal
• Requires special surface treatment for greatest adhesion
• Poor resistance to some acid and alkalines
• Poor abrasion resistance