Home >> News

Parylene provides protection for LEDs.

Nov. 15, 2019

As a Parylene Powder Supplier, there is some information to share with you. Many coatings lose critical performance characteristics when exposed to UV light. For LEDs, the coating must not turn yellow and become brittle when working in a UV-rich environment. This decline not only increases the likelihood of LED light distortion but also provides a passage of moisture into the interior through the coating, causing premature failure. When exposed to a wide range of extreme temperatures, thermal cycling can damage thicker coatings due to expansion and contraction.

Finally, the total weight of the LED must also be considered. The weight of most coatings is a major drawback of many LED applications because their weight can stress delicate electronics and cause component-level damage. When coating a large display panel composed of a plurality of LEDs, the added total weight of the coating is very large, which is a serious challenge for engineering, and an additional structural frame is required to mount such a large display panel. The LED screen is suspended in the air of the train station or stage, fixed on the pole, attached to the corner of the skyscraper, and even installed on trailers and trucks to become mobile screens. These huge electronic displays require infrastructure. Make sure they are safe to display, some weighing even more than £250,000. Reliable protection must be provided without adding significant weight to the final product.

Parylene F Powder

Parylene F Powder

The cost of failure is very expensive, especially the digital display and video identification screen made up of a large number of LEDs. However, most of the traditional conformal coatings used in many areas of electronics manufacturing do not provide a high level of long-lasting protection for LED applications.

Parylene F Powder is a good alternative to heavy liquid coatings and potting materials. It is very thin, lightweight and has good moisture, chemical and media barrier properties. In addition, Parylene F offers unmatched stability in high temperature and UV environments, providing maximum protection for LED applications.

Parylene is the name of a polymer series and is an organic coating material. They are polycrystalline and linear in nature, have good dielectric properties and barrier properties per unit thickness, and are chemically inert. Parylene is a molecular grade polymer that is ultra-thin, optically transparent, and conformable, independent of the size or complexity of the surrounding components.

The parylene is coated by vapor deposition without the use of spot coating, spraying, brushing or dipping processes. The article to be coated is placed in a deposition chamber where it is placed in a powder material called a "dimer" which is located at the other end of the deposition system. The dimer is heated to sublimate it into steam and then heated to decompose it into a monomolecular structure of steam. This vapor is transferred to a room temperature chamber where the dimer spontaneously polymerizes on the part to form a thin parylene film. The coated parylene process is carried out in a closed controlled vacuum system where the deposition chamber is maintained at room temperature. There are no solvents, catalysts and plasticizers in the coating process.

skype whatsapp E-mail