Posted by Jake Hinojoza on Mar 27, 2018 9:00:00 AM

Small PCBs and Parylene

As our electronics advance, they become smaller and smaller. The inner workings of electronics, however tiny, still need to be protected. Printed circuit boards, or PCBs, are the little pieces that make electronics run. To protect them from outside threats, they are covered in what is known as a conformal coating, or a non-conducive film covering. Parylene is a unique conformal coating that is applied as a vapor. Read on to learn more.

Advantages of Parylene

Parylene is unlike other conformal coatings because it is applied as a vapor. The unique application process allows it to thoroughly cover the entires surface of a PCB. In a room temperatures space, the deposition is used and grows on the electronic component. Plastics, ceramics, metals, and fabrics can all have parylene applied to them.

As electronics begin to grow smaller in size parylene is taking a lead role in conformal coatings. When applied, it is thinner than a dollar bill or even human hair. When it comes to choosing a conformal coating, most industry experts will favor parylene.

The Purpose of Conformal Coatings

A parylene conformal coating is applied to an electronic PCB that needs protection from exposure to environmental threats such as dust, temperature, and moisture. Conformal coatings can also protect exposition of PCBs in fraught situations. Sometimes these are electrical currents, mechanical forces, or chemicals. The protection will prevent corrosion and oxidization. It can also extend the life of an electronic.

Problems with Liquid Coatings

It’s important to look at the drawbacks of liquid coating such as epoxy, silicone, and acrylics. Liquid coatings are applied through a dip or spray process and then cure after. Unlike parylene which cures uniformly in a micro-thin layer, liquid applications can be uneven leave potential pinholes that expose the PCB. Liquid coatings also contain additives that reduce the durability and continue to gas-off after application.

Parylene is the conformal coating of choice for many of the above reasons. If you’re ready to move forward with a conformal coating project, contact us today.

Jake Hinojoza

Written by Jake Hinojoza

Jake received his Bachelors of Business Administration from California State Polytechnic and has been with Advanced Coating since 2009.

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