Parylene engineering vapor deposited conformal coatings. Potting does the same thing as conformal coating except that it seals the electronic circuitry from all environments inside a shell or mold but reworking is not as easy or even impossible given the. Sch india offer a complete range of parylene systems to suit small, medium or large volume end users. In the printed circuit community the most common workmanship citations are ipca610, acceptability of electronic assemblies, and. Iso 485 and 9001 quality management system aligns vsi with customers requirements and ensures regulatory.
Image of a board under uv illumination with conformal coating only on the lower. It does depend on several factors including the type of conformal coating you need to remove, where the coating is found and the type of components on the board. However, this solution is cost prohibitive and difficult to rework in the field. Parylene is a conformal protective polymer coating material utilized to uniformly protect any component configuration on such diverse substrates as metal, glass, paper, resin, plastic, ceramic, ferrite and. Removing a polyurethane coating can be difficult due to its a very high resistance to solvents. Conformal coating valuerisk assessment for sandia satellite. It is possible to rework components that are coated with conformal coatings with a soldering iron. Five types of conformal coatings aci technologies, inc. It has consistent thickness with true conformance to the board. Evaluation of esd effects during removal of conformal. The ideal conformal coating as far as processing characteristics are concerned will be onepart twopart systems are very inconvenient to. The key to removing conformal coating from a circuit board is to match the conformal coating type with the. Application method and ease of rework are also important factors, but should generally. Parylene deposition process specialty coating systems.
Cw parylene coatings have been ruggedizing electronics. Conformal coating valuerisk assessment for sandia satellite programs edward m. Because of the vapor deposition method, parylene can be applied very thin and still provide excellent circuit board protection. Coating facts sheet to understand the basic facts on the process. Parylene deposition system operation manual information. If problems in a conformal coating defy reliable repair, coating removal may be the only solution. The basic member of the series, called parylene n, is polyparaxylylene, a completely linear, highly crystalline material. Spraying manual is the most popular and the fastest. Contact curtisswright parylene services with questions related to parylene use in industrial and commercial coating applications, or for assistance with process development and full coating services for your products. Get this basic process wrong and it can be a big problem, leading to the next stage of either repairing the conformal coating leak, stripping the. Download our pdf guide solving conformal coating problems in the application process now.
Parylene coating process click to download pdf of this newsletter. And while these attributes of parylene contribute to the conformal coatings appeal, they also present distinct challenges, particularly in regards to parylene removal, rework, and repair. In order to rework or repair parts on pwas, the conformal coating must be removed. Frequently asked questions faq about conformal coatings. Conformal coating inspection aci technologies, inc.
Aci technologies uses a gen3 systems dc2002 dip coater and gen3 systems sb2900. Application of all types of milspec conformal coatings. Conformal coating removal standards parylene coating blog by. Parylene the parylene conformal coating was applied by a chemical vapor deposition process. A unique difference with the parylene process is that it also coats the underside of low profile. The conformal coating material can be applied by brushing, spraying or dipping. Parylene is considered by many to be the very best thin film conformal coating for environmental protection in high reliability applications.
Guidelines for design, selection and application of conformal coatings developed by the conformal coating handbook task group 533c of the cleaning and coating committee 530 of ipc users of. Parylene vapor deposited conformal coating is considered by many to be the ultimate conformal coating for the protection of devices, components and surfaces in the electronics, instrumentation, aerospace. Developed by the conformal coating handbook task group 533c of the cleaning and coating committee 530 of ipc. Parylene c, the second commercially available member of the series, is. Discover the standards that are used in conformal coating removal and how to use them. Guidelines for design, selection and application of. Typically used in rework and repair, in this method conformal coating is applied with a brush to specific areas of the board a simple technique that is low cost but. Removal of coating clean up of exposed area replacement of component clean up re. Conformal coating overview conformal coatings are specialty film forming products. Although parylene is a conformal coating it is different compared to the standard wet liquid conformal.
Parylene can be effectively deposited with excellent accuracy in the thickness range of 0. Parylene conformal coatings is a unique type of coating applied by vapor. Surface preparation is critical for conformal coating protection robert dusty askin senior materials engineer. This incredibly reliable coating system has been sold all over the. Open collaboration reduces risk and provides the best experience in parylene. Xy parylene conformal coatings are a unique type of coating applied. Ultra thin and absolutely conformal parylene film is an effective option for this application. Rework and removal of uv lightcurable conformal coatings dymax conformal coatings are solventfree, uvvisible lightcurable resins that are applied as thin coating layers on electronic devices for. Manual spraying conformal coating can be applied by an aerosol can or.
The raw material for this process is diparaxylelene, which is a dimer composition. Conformal coating inspection continued on next page quality conformance. Parylene conformal coating services vsi parylene is here. While many varieties of coating exist including a few specialty types there are five main categories based on the substances chemical makeup. Parylene conformal coating services, equipment and raw. Variables that influence the parylene coating process. Coating facts sheet parylene conformal coating is becoming an ever increasing part of everyday life for the defense, biomedical, and other industries. For singlecomponent urethanes, the preferred method of removal is. Surface preparation is critical for conformal coating. Preparing for conformal coating assemblies and facilities. There are numerous other applications as parylene is an excellent.
Primaprotect conformal coating cc7e from ai technology, inc. Corrosion is the chemical or electrochemical reaction between a circuit board, usually a metal, and its environment, that produces a deterioration of the circuit and its properties. Assemblies, the recommended procedure for rework is to remove parylene. The essential guide to conformal coating techspray. Model pds 2010 labcoter deposition system is the first portable system designed for deposition of protective. The parylene deposition process consists of two general parts the science, explained above, and the art. Conformal coatings for tin whisker risk management william fox and linda woody lockheed martin missiles and fire control ocala, florida abstract the objective of this study is to evaluate conformal. Conformal coating material is a thin polymeric film which conforms to the contours of a printed circuit board to protect the boards components. Ipccc830 and mili46058c do not define the quality of the application. Which type of conformal coating is right for my pcb. Polyparaxylylene xy, also known as parylene, is a coating that is vacuum deposited in a process called chemical vapor deposition cvd.
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