What are the types of materials for membrane switches
There are many types of membrane switches, but the materials used are also different, just like PET membrane switches are made from PET raw materials. Mainly about the types of materials for membrane switches.
Polyvinyl chloride (PVC) is stable to acids, alkalis, and salts at 60 ℃ \ 0.175~0.5/smooth surface at room temperature. Okay, it is flame resistant, self extinguishing, noise and vibration reducing, and has good electrical insulation. Poor thermal stability. Low cost ordinary signs and panels.
Polycarbonate PC-60~120 ℃ \ 0.175~1.0 has high gloss transmittance, low water absorption, good dimensional stability, bending, tensile, and compressive strength, excellent heat and cold resistance, electrical insulation, and atmospheric aging resistance. Poor chemical resistance and fatigue resistance, prone to stress cracking. The output interface terminal circuit is generally printed with carbon material and does not have a protective coating. It gradually forms a peeling layer due to air oxidation, which can lead to circuit breakage and end of life. This is where membrane switches are prone to failure, mainly determined by the environment. Whether used or not, the physical damage time is 3-10 years.
Sand surface polyester (PET) -30~120 ℃ \ 0.1~0.2 smooth surface has good drug resistance, is insoluble in general solvents, and is not resistant to alkali. It has excellent mechanical and electrical properties, rigidity, hardness, and high strength and toughness among thermoplastic materials, low water absorption, excellent wear and friction resistance, and high dimensional stability. The tensile strength can be comparable to aluminum film and higher than PC and PVC. Due to the difficulty in processing the surface into a matte shape, textured PET is relatively expensive and is an ideal substrate for making thin film switch circuits. Among them, textured PET is suitable for products with high surface requirements or liquid crystal display windows.