Metal Dome is made of one or more pieces of Metal shrapnel attached to a piece of PET that you can tear off directly from the release film and attach very firmly to your product.This method of assembly is easy to install, low cost, low contact resistance, anti-oxidation and wear resistance, high life, and can replace the light touch switch.
Metal Dome can be customized according to customer product requirements, It can be attached to PCB or silicone.There are two common structures.
Structure One: double-layer structure adhesive conductive film
MYLAR + SPACER + DOME +
1.Mylar
2.Spacer
3.Metal Dome
4.Product film
This is a commonly used double-layer structure, which is directly attached to the PCB.The top layer is Mylar, and the bottom is Spacer.Mylar is completely overlaid on Spacer, with the purpose of preventing external dust from entering the operating space and thus stabilizing the conductivity of the conductive film.
On Spacer, there is usually an air-tight design between the domes, with blowhole exhaust and slot exhaust.To increase the feel and prolong the life of the role.
Structure Two : Rubber adhesive conductive film
RUBBER + MYLAR + SPACER + DOME + Protect film
1.Rubber (Double-sided adhesive)
2.Mylar
3.Spacer
4.Metal Dome
5.Product film
Rubber conductive film is stick rubber on MYLAR of double conductive film. Therefore, it can be firmly attached to the Keypad and not easy to tear off. It is also called as stick conductive film.
Product Specification
Total Thickness of Glue: 0.28-0.45mm
| Project\Glue | Thickness (mm) | Initial force | Retentivity （hr/kg*inch) | Adhesion （kgf/inch) |
| Rubber | 0.125 | 10cm Adhesive rolling distance of the corresponding model steel ball is less than 10cm | 24↑ (Silica gel and synthetic resin) | 0.8↑(Silica gel) 1.0↑ synthetic resin) |
| clear | Thickness of adhesive :0.025~0.05 | Adhesive rolling distance of the corresponding model steel ball is less than 10cm | 8↑ | 0.6↑ |
| Base material : 0.025/0.05/0.075/0.1 | ||||
| white | Thickness of adhesive:0.025~0.05 | Adhesive rolling distance of the corresponding model steel ball is less than 10cm | 8↑ | 0.6↑ |
| Base material : 0.025/0.05/0.075/0.1 | ||||
| black | Thickness of adhesive:0.025~0.05 | Adhesive rolling distance of the corresponding model steel ball is less than 10cm | 8↑ | 0.6↑ |
| Base material : 0.025/0.05/0.075/0.1 |
2. Specifications of shrapnel: round, waist, triangle, four-angle shrapnel, etc
3. Dimensional tolerance: ± 0.05- ± 0.15mm
4. Operating temperature: -40 ℃ -85 ℃
5. Operating humidity: below 100% RH
