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DESIGN GUIDE: SILICONE RUBBER KEYPADS AND CONDUCTIVE RUBBER KEYPADS
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Button Travel Note: For good tactile feel a travel of 1.2 mm and a force of 135 grams is recommended. |
Typical Effects Above effects are estimated according to typical key structures. |
Rubber Keypad - General Specification
| Travel | 0.8 - 1.5 mm |
| Force | 60 - 300 grams |
| Tactile Response | Yes |
| Life Cycles | 1,000,000 |
| Operating Temperature | -40° to + 150°C |
| Storage Temperature | -50° to + 170°C |
| Dielectric Strength | >1 min @ 500 VRMS |
| ESD Breakdown | 20KV/MM |
| Contact Bounce | <5MS |
| Contact Resistance | <200 Ohms |
Physical Properties of Silicone Rubber
| Typical Physical Property | Carbon Conductor | Silicone Insulator |
| Specific Gravity@ 72°C | 1.18 | 1.17 |
| Durometer Hardness (Shore A) | 65 ± 5 | 30-80 ± 5 |
| Tensile Strength (KG/CM) | >50 | >70 |
| Elongation (%) | >100 | >250 |
| Tear Strength (KG/CM | >9 | >12 |
| Linear Shrinkage (%) | 3 - 5 | 3 - 4.5 |
| Volume Resistivity (Ohm/CM) | <5 | 1x1015 |
Dimensional Tolerances
| Dimension | Tolerances | ||
| Inches | MM | Inches | MM |
| 0 - .987 | 0 - 25 | .005 | .13 |
| .998 - 1.460 | 25.1 - 37 | .008 | .20 |
| 1.461 - 1.971 | 37.1 - 50 | .010 | .25 |
| 1.972 - 2.444 | 50. - 1-62 | .012 | .31 |
| 2.445 - 2.956 | 62.1 - 75 | .015 | .38 |
| 2.957 - 3.428 | 75.1 - 87 | .017 | 44 |
| 3.429 - 3.940 | 87.1 - 100 | .020 | .50 |
| 3.491 - 5.908 | 100.1 - 150 | .024 | .62 |
| 5.909 - OVER | 150.1 - OVER | 0.5% | 0.5% |
