Most QWERTY computer keyboards use a single rubber-like membrane underneath the keys that makes contact with a circuit board when the key is fully depressed. Also called a "dome switch keyboard ...

Products & Capabilities. Elastomers. Gaskets, O-Rings, Seals. Diaphragms. Molded/Laid-Up Tubes and Hoses. Shock Mounts. PTT/Volume/Squelch/Function Buttons and Knobs ...

but instead locate characters on the top layer of a three-layer membrane. The characters are printed onto a flexible polymer film that covers the entire keyboard, upon which a soft rubber dome is ...

There was once a time when membrane keyboards were pretty much your only option. If you could find a mechanical keyboard, it ...