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Silicone
rubber
Silicone
rubber contacts are made of high elastic, nontoxic silicone
rubber compounds, which are process by compression or
injection molding and curing. The result is economic
and reliable keypads with high productivity. It also
provides great convenience for integration with printed
circuit in any form and its sensitivity and tactile
feedback can be adjusted for definite and satisfactory
feeling on operation, which conducts better than plastic
keypad.
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Features
of Silicone rubber
The silicone rubber is a synthetic rubber, with chemical formula
which has the main agent, the Silicone-oxygen skeleton.
| The
Silicone rubber has excellent characteristics as follow: |
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1
Environmental durability: Superior resistance to heat
and low temperature, range from -40/c° to 180/c° , even
in heavy humidity.
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| 2
Contamination proof: due to its physical construction
and electrical characteristics, silicone rubber keypads
can be free from dust and insolate contamination. |
Physical
Properties
| Parameter
|
Conductor
|
Insulator |
| Specific
gravity |
1.18 |
1.11-1.18 |
| Durometer
hardness |
50+/-5 |
40-80+/-5 |
| Tensile
strength (kg/cm2) |
60 |
70 |
| Elongation
(%) at break |
>100 |
>100 |
| Shera
strength (kg/cm2) |
9 |
12 |
| Compression
(%) |
<30
|
<35 |
Electrical
Characteristics
| Contact
resistance |
<200
Ohm at 12VDC 30mA |
| Insulation
resistance |
>100
Ohm at 250VDC |
| Max.
contact loading |
24VDC
100mA |
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