Rubber keypads are user-equipment interface utilities that allow for the communication of commands from a user to an electronic device. They are similar in terms of their operating principles and intended purpose to other keypad varieties; membrane keypads and keyboard switches both accomplish the same purpose. Rubber keypads distinguish themselves from other keypad varieties only in terms of their composition.
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Rubber keypads can be made of any rubber material, but they are most commonly manufactured using silicone, which is a synthetic rubber material prized for its versatility. Rubber keypads are used in all kinds of contexts throughout industry and commerce. Many industrial processing machines involve the use of rubber keypads in control panels. Commercial cleaning equipment like floor buffers and polishers often are equipped with rubber keypads because of their resistance to accidental spills and contaminants. Rubber keypads can even be used in consumer products; they can be found on some food processing utilities, on calculators, cell phones, remote controls, computer keyboards and on many other kinds of consumer electronics.
Rubber is employed as a keypad material for many reasons. Rubber keypads exhibit a wide temperature resistance and color range and can be expected to last throughout the life of the electronic device in which they are installed. Silicone rubber keypads can be made in several ways, but compression molding is among the most widely used methods. Compression molded silicone keypads can be custom-made to a wide range of specifications. Silicone, when heated sufficiently, can be thermoformed. During the thermoforming process, silicone rubber is inserted into a molding machine. The machinery heats and pressurizes the silicone so that it becomes plasticized; plasticization is the process by which a material becomes elastic enough to be shaped easily. The plasticized silicone is then forced into a mold, which gives the material its shape. When it emerges from the mold, it is cured and subject to finishing processes like laser etching and silicone ink graphic printing. Matte or glossy textures can also be added to a molded silicone keypad's surface. Once fully formed and processed, silicone keypads can be affixed to electronic devices in many ways, and there are several ways in which silicone keypads are used to send signals to electronic devices. Each method depends on the nature of the devices to which they will be attached; for this reason, electronic device manufacturers choose their designs carefully. Poorly matched keypad-device combinations can lead to premature device malfunction or failure.