Silicone Rubber Keypad Types | Innovative Design Products, Inc.

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Silicone Rubber Keypads - Types
Basic Construction | Keypad Designs

Conductive Carbon Pill Elastomer Over a Printed Circuit Board

	Elastomer
	PCBA

This construction provides tactile feedback from the elastomer and the carbon pill is used as a shorting element to the lower circuit.

Tactile Elastomer Over a Sealed Non-Tactile Membrane

	Elastomer
	Adhesive
	Top Circuit
	Spacer
	PCBA

This construction provides tactile feedback from the elastomer. The printed shorting pads serve as the shorting element to the PCBA. This design seals the contacts and is an advantage to keep the contacts clean.

Non-Tactile Elastomer Over a Sealed Tactile Membrane

	Elastomer
	Adhesive
	Top Circuit
	Spacer
	PCBA (Alternative is a polyester lower circuit)

This construction provides tactile feedback from the membrane. The printed shorting pads serve as the shorting element to the PCBA. This design seals the contacts, and is an advantage to keep the contacts clean. An alternative design is to incorporate metal domes and eliminate layers.