Silicone Rubber Keypads are manufactured from elastic,
silicone rubber and are processed with compression or
injection molding. The results are an economical and reliable
Cubbison can integrate your silicone rubber keypad with a
graphic overlay, printed circuit board (PCB), membrane ½ switch or
copper flex to allow you additional flexibility in your design.
The natural color of raw silicone rubber material is
translucent white, silicone rubber can be blended with color
pigments to obtain the color required. Durometer is one of several
ways to indicate the hardness of a material. Suggested hardness for
silicone rubber keypads is 40 to 60 shore A. A higher
durometer silicone rubber keypad offers higher actuation force,
snap ratio but shorter life. A Lower durometer silicone
rubber keypad has lower actuation force, snap ratio but
longer life. Silicone rubber is available in UL flame
classifications of UL94HB and UL94V0.
Dual durometer solutions are also available. In this
construction, the harder durometer rubber is used for the key
top and the softer durometer rubber is used for the base.
Graphics can be applied directly to the keytops of
the rubber keypad by screen printing. The
optimum keytop for printing is flat keytop.
However, some curved keytops can also be pad
After the part is molded, the entire top surface of
the keypad is spray-painted with one or more colors. A
laser is used to etch graphics on the keytops exposing either
the under layer of paint or the raw rubber.
Silicone rubber keypads can also be spray-coated
with PU resin to provide lifetime abrasion resistance
and oil resistance.
A screen printed or spray-painting process is used to
apply an additional protective clear silicone ink on the
keytops. The process enhances the abrasion resistance of the
Silicone rubber keypads can be coated with a layer of
epoxy resin to form a hard top and feel like plastic.
The epoxy coating also provides enhanced abrasion
resistance for the printedgraphics.
Similar to Dual Durometer, a keypad can be produced using
one color of rubber for the key top and a separate color for
This process allows specific areas of a keypad to be
molded with different colored rubber.
This provides different base colors without
requiring complicated spray-paint techniques. Silk
screening is typically done on top of these base colors to
provide additional graphics.
Pre-molded hard plastic keytops can be applied to the
molded rubber key pad. This provides a hard key feel with
the economies and efficiencies of a rubber keypad.
Silicone rubber keypads can be molded with carbon pills,
or screen printed conductive ink according to the
application requirements. Due to the low cost of
production and acceptable
resistance, most conductive rubber keypads are molded with