Conformal Coating Selection: Weighing the Pros and Cons for Your Application
Parylene Coating Blog by Diamond-MT
Conformal Coatings are used regularly in an attempt to cover technology designs on printed circuit boards (PCBs). Normally, this is done by using a pigmented (coloured) conformal coating which obscures the components below the conformal coating material.
In applications that have an exposure to solvents, acrylic conformal coating is not the best choice. Acrylic conformal coating can be removed with a weaker solvent such as isopropyl alcohol or xylene. Whenever it faces even stronger solvents, it will not offer the protection that is needed, especially if your product is a mission critical device. Other coatings, such as urethane or parylene conformal coating have a far better resistance to solvents than acrylics.
Tags: acrylic conformal coating, parylene conformal coating, conformal coating, silicone conformal coating, conformal coatings, HumiSeal 1B31, urethane conformal coating, HumiSeal, epoxy conformal coating
WHAT IS CONFORMAL COATING
Conformal coating is a protective non conductive dielectric layer that is applied to protect the assembly from damage due to contamination, salt spray, moisture, fungus, dust and corrosion caused by harsh or extreme environments.
ARE THERE DIFFERENT TYPES OF CONFORMAL COATING?
There are 5 different mediums for conformal coating:
- Acrylic Resin
- Urethane Resin
- Epoxy Resin
- Urethane Resin
WHAT ARE THE BENEFITS OF EACH TYPE OF CONFORMAL COATING?
- Parylene (Type XY)
- Acrylic Resin (Type AR)
- Epoxy (Type ER)
- Polyurethane (Type UR)
- Silicone (Type SR)