Design Guide
Button Travel (mm)
Typical Effects
| Auctuation Force | Tolerance | Tactile Feel |
| 50 grams | ± 15 - ± 20 | Excellent |
| 70 grams | ± 20 - ± 25 | Excellent |
| 90 grams | ± 20 - ± 30 | Excellent |
| 100 grams | ± 25 - ± 35 | Excellent |
| 120 grams | ± 25 - ± 35 | Excellent |
| 150 grams | ± 30 - ± 40 | Good |
| 170 grams | ± 35 - ± 50 | Good |
| 200 grams | ± 50 | Fair |
Silicone Rubber Keypad - General Specifications
| 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% |
Tactile Characteristics of Keys
| Item | Cone | Double Cone | Bell | Double Bell | Flat |
| Type |  |
 |
 |
 |
 |
| Range of Pressure (Grams) | 30-250 | 50-250 | 80-200 10-200 (non-click) |
30-200 | - |