עברית

FAQ

Q Is the coating thickness uniform or are there variations in the application? A The coating is defined within a tolerance of 20% from the submerged thickness. However, it is possible to reach even finer resolutions. Q What is the maximal device size that can be coated with Parylene ? A The only limitation imposed on the size of a component / device that can be coated is the dimensions and volume of the vacuum chamber, in which the coating is produced. The chamber's common shape and dimensions are a barrel/cylindrical shape, ½ meter in diameter at most, and with a height of 60cm. Simtal has been developing new capabilities that extend the dimensions even further (~150%), depending on specific project requirements. Q What is the maximal thickness ? A In effect, there is no limit to the thickness Parylene coatings can reach. However, when considering possible coating thickness, one must remember that Parylene is different from other conformal coats, as a thinner coat of Parylene will perform far better than its competition. Q Is the coating thickness reproducible between cycles ? A Simtal is capable of maintaining almost flawless thickness conformity between cycles. Q Is the coating transparent ? A Parylene coating is transparent. Shades ranging from full transparency to a complete opaque white can be reached, while conforming to the requirements of the device or apparatus. Q What is the quantity of units that can be coated per cycle ? A The quantity per cycle /application is proportional to the dimension of the coated device/apparatus, its geometry and other requirements. Q What thickness is required for Parylene features to be realized ? A Parylene can provide excellent physical characteristics even when a coating of single microns is applied. The necessary thickness will be determined by the requirements of the specific application. Q How many days does the coating process require ? A Determining how long a coating process might take varies and is based on professional considerations and customer needs. In general, the rate of settling is ¼ micron per hour, to 3-4 microns per hour in rare cases.  Q Is Parylene priced like other standard coatings ? A It all depends on the volume of the coated device/apparatus; maximizing the number of devices in a single batch will decrease the cost per unit. Parylene can therefore be more cost effective compared to other coating methods. Moreover, it is important to remember that Parylene's unique characteristics are unmatched by other conventional coatings. Q Parylene vs. other coating methods A Parylene provides a multi-disciplinary solution, which meets specific standards and does not contradict other device standards, but rather improves on the general performance of the device. For example, the ability to seal off fluids, does not conflict with the ability to transmit RF signals; in fact the device will even show greater resistance to a phenomena known as ‘Tin Whiskers’ for years to come. With other conventional coatings, combining these solutions and characteristics would not be possible.  Q What are the disadvantages of Parylene ? A The Parylene coat is sensitive to mechanical cutting stress; while being extremely durable to impact. The coating is sensitive to prolonged UV exposure, under a specific spectrum when coupled with the presence of oxygen. The absence of Oxygen eliminates UV sensitivity. Q How many years will the coating last ? A Under suitable conditions and in the right environment, the coating is expected to last decades.. Q Can the coating be removed ? A What is the removal procedure?The coating is resistant to all types of chemicals, even the most aggressive ones. Therefore, the only way to remove the coating is by employing mechanical or thermal methods (heat). Q Is it possible to fix components after coating ? A Yes it is possible to fix or replace components. See link for more information 
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