We find that during our product design process that customer requirements have us design with certain specific materials. General requirements for our specific brand of damper usually needs materials with low coefficient of thermal expansion. For most environments engineering materials such as POM and stainless steel can be used. In a controlled environment like a sterile lab, household and clean rooms we can use a wider array of materials.  Since our product is non-particulating we can be used in any class clean room without reservations. Medical devices that need a lid or the rooms they are assembled in, can use our type of damper.  So please contact us for all your friction hinge and damper needs at www.mmtech.us for a free initial consultation. Phone us at 203-406-7900