A membrane switch dome

Due to the relatively short travel of membrane switches, it is often necessary to provide some type of feedback to the user. Feedback can be visual, auditory or tactile.
Visual or auditory feedback should be a consideration in electronic design.
Domes can be added to membrane switches to provide haptic feedback.
We use two types of domes in membrane switches keypad, stainless steel and polyester. There was no significant difference in reliability between the two dome technologies.
Many people prefer the feel of a stainless steel dome. Stainless steel domes also require lower initial tooling costs. Stainless steel domes are almost always used for printed circuit board based membrane switches keyboard.
The disadvantage of the stainless steel dome is: the pressing life is 300,000-500,000 times, and the cost of assembling the circuit is high.
The polyester dome is usually formed in the top circuit of the membrane switch and has a press life of 1 million times
Polyester domes require relatively expensive machining tools made specifically for each design.
As production increases, polyester domes become more cost-effective because they do not need to be assembled individually. As a general rule of thumb, if total dome usage per order is expected to exceed 2500, it makes economic sense to consider polyester domes. One disadvantage of polyester domes is that they tend to relax and lose touch at high temperatures and are not recommended for applications above 55˚C (131˚F).
Disadvantages of polyester domes are: expensive to make molds, cannot pass high temperature
Each type of dome has advantages and disadvantages, choose the most ideal dome touch according to customer needs
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