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Parylene Coating for IP68 Hermetically Sealed Load Cells

To provide additional protection in extreme environments/atmospheres where stress corrosion could occur on stainless steel load cells, any IP68-rated hermetically sealed load cells manufactured by Thames Side Sensors Ltd. can be provided with a special transparent ‘Parylene’ coating to give excellent resistance to aggressive chemicals. This can increase the lifetime of these load cells by a very significant margin. Parylene is the generic name for poly-para-xylylenes. These materials form linear, highly-crystalline polymers that are chemically & biologically inert and stable, therefore they are excellent barrier materials. Coating thicknesses on load cells are typically 15-18 microns (μm) and are pinhole-free. Contact us now for a quotation specific to your application. Key data about Parylenes: – They are almost completely unaffected by solvents, have low bulk permeability and easily pass a 100 hour salt-spray test. – They also have good thermal endurance and can perform in air without significant loss of physical properties for 10 years at +80 °C. The Parylene Coating Process: – The process is unique in coating technology and is carried out under vacuum with specialised equipment. – The coating chamber is at room temperature and the pyrolised Parylene vapour condenses on all surfaces uniformly and with equal thickness. This vapour can pass through holes as small as 1 micron in diameter. – The Parylene vapour then spontaneously polymerises to form a product with a high degree of crystallinity.

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