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Why doesn't Parylene Coating Monopolize the Coating Industry?

Apr. 27, 2020

As a Parylene Powder Supplier, share with you. Parylene is a protective polymer material, which uses a vacuum vapor deposition process to form a protective film. The film has the characteristics of uniform thickness, dense pinhole-free, transparent and stress-free, excellent electrical insulation and protection. Mainly used in coatings, it is the only solid coating in military standards. So, why the parylene coating with such excellent performance has not monopolized the coating industry so far?

Parylene C

Parylene C

Parylene coating advantages

According to the different molecular structure, Parylene can be divided into Parylene Ctype, D type, N type, F type, HT type and other types, with performance advantages that other coatings are difficult to compare: it can be applied to surfaces of various shapes , Including sharp edges, cracks and internal surfaces; the paint does not contain solvents, which overcomes the shortcomings of the solvent-based paints used in the past due to the evaporation of the solvent during the drying process and will inevitably leave many fine pinholes, providing a real Pinhole protective film; comprehensive characteristics, including dry coating lubricity, particle stability, hydrophobicity, biocompatibility, chemical insolubility, no by-products in the production process, unknown sensitivity to hydrolytic erosion, thermal stability, low Permeability and high insulation.

Parylene material has so many advantages, so many uses, why not monopolize the coating market?

Let us first look at its process: take Parylene D as an example, using vacuum vapor deposition process. Put the Parylene powder in the cavity of the coating equipment first, and then vaporize the solid powder at 150-170 ℃ under vacuum, then crack in the cracking chamber at 650 ℃ to form the methylene state, and finally submerge in the deposition chamber at normal temperature. The methyl bonds combine to form a stable parylene polymer, which is deposited on the sample to be protected to form a protective film.

There are several difficulties in this: 1. The coating studio must be kept clean and dry; 2. Parylene vacuum coating requires special coating equipment; 3. Strict process requirements: no personnel are allowed to take naked hands in all parts of the process Operators must wear anti-static overalls, anti-static wrist straps, and anti-static finger holsters.

On the one hand, due to technical limitations and high experimental requirements, the Parylene coating process is more complicated than ordinary coatings. When not necessary, people tend to choose a relatively simple method; on the other hand, due to cost issues, Parylene generally only Used in high-value products. Therefore, although Parylene has achieved the market of high-end products, it cannot be widely used in the coating market, so it cannot monopolize the entire coating industry.

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