Durable & Ruggedized Solutions

Sealed Keypads

CSI Keyboards designs and build products to last. We understand the importance and function that our keypads have in your products and design the keypads to withstand the test of time. We have over three decades of experience a membrane keypad supplier, designing high quality keypads that are both extremely durable and ruggedized. We have designed a durable membrane keypad and custom human machine interfaces that have gone into some of the toughest of environments and switches that need to meet specific environmentally sealing requirements for Temperature, Water, Dirt, Dust, Humidity, Altitude, Impact resistance, Vibration, and Chemical resistance.

Parking Meter Keypad Assembly 

This application was a parking meter that was currently using a non-tactile capacitive switch using molded polycarbonate. The customer’s end goal was to create a keypad that had raised profile and tactile feedback with each button press, while maintaining a waterproof seal against the weather’s elements. This keypad can now be seen on city streets across the country.


  • Molded silicone rubber keys with UV resistant coating
  • Tactile domes to improve tactile feedback
  • Copper flex circuit
  • Rubber designed to provide a water tight seal
  • Metal backer for mounting and rigidity
  • Flex tails exit rear of assembly for connection
Sealed Keypad
CSI Keyboards, membrane keypads, elastomer keypads, complete turnkey assemblies, integrated touch screen solutions, capacities switches, plastic injection molding, printed circuit board assemblies, display solutions, backlighting solutions, environmental sealed HMI solutions, Peabody MA

Sealed Rubber Keypad Assemblies

CSI Keyboards has become the go-to membrane keypad manufacturer for environmentally sealed rubber keypad designs. Sealing can be designed into the rubber and our proprietary bonding methods can also be designed in to create NEMA 2, 3 and 4 assemblies. We can design and customize gaskets per your requirements or IP standards which include both IP67 rated membrane keypads and IP68 rated membrane keypads. We have designed sealed rubber switches for marine navigation controls, medical equipment, military applications, industrial controls and food packaging equipment.

Sealed Rubber Keypad

Copper Flex Circuitry

CSI Keyboards uses copper flex circuitry in the majority of our keypad designs due to its excellent dielectric strength, thermal stability, chemical resistance and flexibility. Copper flex, also known as Kapton circuits, has become the superior choice over printed silver especially for outdoor applications. A printed silver circuit can be replaced with a copper and polyimide circuitry construction with minimal additional cost. Copper flex circuitry construction designs offer a significant advantage over printed silver. 

Copper Flex membrane switch panels are produced using polyimide (Kapton) as the base material. Copper flex switches are manufactured by laminating a thin sheet of copper to a flexible film substrate. The copper is then chemically etched away, leaving the copper traces. An additional layer of polyimide is laminated to the circuit leaving the gold contacts exposed.

Advantages of copperflex over printed silver circuitry is as follows:

  • Improved creasability – the ability to fold or crease without causing open circuits which you are susceptible to using silver ink
  • Ability to put solder components directly on flex, better adhesion than bonding to silver ink
  • Much more resistant to thermal shock
  • No potential problems with silver migration
  • Greater conductivity
  • Lowering the closed loop resistance and switch bounce will be reduced by gold plating the contacts. We will have a gold to gold contact with no bounce versus silver to gold dome
  • Applying stiffener to tail end using heat lamination versus cold lamination which provides better adhesion and better for pinning
  • Ability to have a 0.5mm pitch vs. the 1.0mm minimum with printed silver
  • Tighter trace routing capabilities
CSI Keyboards Membrane Switch

Opti-Bonded Windows

CSI Keyboards has perfected the design, manufacture and application of clear polycarbonate to reinforce membrane switch display windows. By optically bonding durable, clear polycarbonate, CSI is able to strengthen the viewing areas over LCD’s, and VFD’s, etc. while retaining the clear clarity necessary in reading these displays. The process enables us to use standard overlay thicknesses (.005″-.010″) for flexibility, embossability, and cost while providing .030″-062.” or more in thickness over the display. The Opti-Bond advantages include: abuse protection, readability, and a sealed window created using one continuous overlay surface.

Opti Bond Window

The CSI “Seal Frame”

CSI Keyboards’ proprietary perimeter “Seal Frame” switches have proven to be as robust as other sealing methods such as perimeter temperature sealing and can be included in your design at minimal additional cost.

Proprietary Potting Solution

CSI Keyboards developed a proprietary potting solution that will protect your user interface and product from all of the elements. This solution was originally intended for marine interfaces as marine controls and instrumentation face some of the greatest challenges when it comes to the environment they must to perform in. The potting solution and design 100% seals the interface that is being constantly exposed to all of the elements which include heavy UV exposure, extreme levels of moisture, and temperature extremes.

Environmentally Resistant and High Performance Polyester & Adhesives

CSI Keyboards utilizes polyester specially formulated to resist ultraviolet light, moisture and wide variations in temperature. CSI Keyboards offers both fine and velvet polyester textures specifically designed for outdoor applications. Our membrane keypads are UV, humidity and chemically resistant.

CSI Keyboards utilizes the top of the line adhesives specially formulated to provide high bond strength to surfaces. Our adhesives are resistant to humidity, UV, water, temperature, and chemicals.

IP67 Waterproof Membrane Switch

Life Extending Cushion Switch

CSI Keyboards’ Life Extending Cushion Switch or LEC Switch significantly increases the life of both the switch and graphic overlay and does it all while maintaining the time proven standard membrane switch construction. The LEC gives the keypad distinctive tactility with 90% less chance of damaged domes, or graphic overlay cracking and fatigue. The LEC also increases static immunity and has approximately 15kv to 20kv ESD immunity (no discreet shield necessary). The Life Extending Cushion is one of many advances CSI has brought and continues to bring to the keypad industry.

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