Silicone rubber keypad contacts or keypads are made of high elastic, nontoxic silicone rubber compounds, which are processed by compression or injection molding and curing. This results in economic and reliable keypads which ensure high productivity and useful life. It also provides great convenience for integrating with the printed circuit boards in any form. The sensitivity and tactile feedback can be adjusted to satisfy the operator needs. Due to its excellent characteristics, the silicone rubber switch is utilized in various industries to satisfy cost, reliability, environmental, and ergonomic/ cosmetic styling needs.
Silicone rubber keypads offer a superior alternate look and feel than that of traditional polyester or polycarbonate graphics. At Elcom Design, Inc., we offer a vast multitude of design options and enhancements for electrometric applications including abrasion, chemical and UV resistance; carbon pill and polyester half switch designs, screen-printed or laser etched graphics, as well as epoxy enhancements and edge gasket configurations.
Specification of Silicone Rubber Keypad:
| Contact resistance |
<200 Ohms |
| Actuation force |
100 +/- 25 grams typical |
| Life cycle |
1,000,000 typical |
| Contact bounce |
10msec. max |
| Pretravel |
0.20mm typical |
| Operation temperature |
-40 °C to +150 °C |
| Storage temperature |
-50 °C to +150 °C |
| Travel |
0.8mm to 120mm typical |
| Material hardness |
50+/- 5shore A typical |
Electrical Specification of Silicone Rubber Keypad:
| Insulation Resistance |
less than 100 M-ohm at 250V DC |
| Contact Resistance |
Conductive pills less than 200 ohms
Metal pills greater than 0.01 ohms
|
| Maximum Contact Loading |
100mA , 24V DC |
| Contact Material |
±0.05mm |
| Outline Tolerance |
Carbon impregnated silicone rubber Gold
plated metal pill |
Typical Key Structure of Silicone Rubber Keypad:
| 1)Key Travel ----------------------- 0.25 ~5.0mm. |
| 2)Actuation Force ------------------ 20 ~ 350 grams |
| 3)Operating Life -------------------- 1 million (typical), 10 millions (special) |
| 4)Operating Temperature ---------- -30°C/font>C ~ 150°C/font>C |
| 5)Storage Temperature ------------- -42°C/font>C ~ 175°C/font>C |
| 6)Printing Range Slope ------------- +/- 0.5 mm |
Dimension Tolerance of Silicone Rubber Keypad:
| 6.50mm or Less |
+/- 0.15mm |
| 6.50mm - 10.0mm or Less |
+/- 0.20mm
|
| 10.0mm - 16.0mm or Less |
+/- 0.20mm |
| 16.0mm - 25.0mm or Less |
+/- 0.25mm |
| 25.0mm - 40.0mm or Less |
+/- 0.35mm |
| 40.0mm - 63.0mm or Less |
+/- 0.40mm |
| 63.0mm - 100.0mm or Less |
+/- 0.55mm |
| 100.0mm - 160.0mm or Less |
+/- 0.70mm |
| 160.0mm and up |
+/- 0.5% |
Actuation Force Tolerance of Silicone Rubber Keypad:
| 50 grams |
+/- 15 grams |
| 75 grams |
+/- 20 grams
|
| 100 grams |
+/- 25 grams |
| 125 grams |
+/- 30 grams |
| 150 grams |
+/- 35 grams |
| 140 grams |
+/- 40 grams |
| > 200grams |
+/- 30 % |
| 
