When design which type of dome switch should to be used, the following information will be helpful, as it explained the advantage of polyester dome (Polydome) and disadvantage of polydome, while comparing with conductive silicon key and metal dome array
Polyester dome Advantages (comparing with conductive silicon key):
Better clicking feeling
Design Flexibility: trip force and travel (stroke) can be adjusted according to customers’ requirement.
Polyester dome Advantages (comparing with metal dome array):Recover easily after bending and does not affect the function
Polyester dome Disadvantages (comparing with metal dome array):
It has poor fatigue resistance and is easily damaged by repeated operations.
Less range of trip force, travel/stroke
Lower working voltage/current
Higher contact resistance
Only smaller size is available
Less life cycles: metal dome >= 1 Million times
Fixing performance: It needs to be fixed on product by screws.
No so good click feeling
Higher setting up fee, need tooling even for samples making
It does not have the ability to fix itself and needs to be fixed on the product by screws, registration pillar of keypad/PCB, or add additional glue layer on top or bottom layer.
Click to see more comparing between Polyester dome and metal dome, switches Polydome-VS-metal-dome, to see the difference between two types of dome switch.