Silicone Rubber Keypads
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Technical Details:
Typical Design and Construction
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| 1. Minimum curvature 1.0 mm Ø 2. Minimum curvature 0.5 mm Ø 3. 1.5 mm 4. 1.5 mm 5. See 1 and 2 6. a+ 2.5 mm 7. 1.5 mm |
8. H<7 mm, R=0.4 9. <H<10 mm, R=0.9 10. 0.2 mm mdinimum 11. 1.5 mm 12. 1.5 mm 13. 0.3 mm 14. ³1/2 h |
15. Symmetrically placed no farther than 5 mm apart 16. Conductive Pill - 2.0 to 8.0 mm Ø x 0.60 mm thick 17. Stabilizing posts provided to minimize wobble |
General Tolerance Table
| Dimension | Tolerance |
|---|---|
| Under .400 | ±.004 |
| .400 - .790 | ±.006 |
| .791 - 1.184 | ±.008 |
| 1.185 - 1.574 | ±.010 |
| 1.575 - 1.920 | ±.012 |
| Over 1.920 | ±7% |
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 | - |
Keytop Printing Standard
| Test Applied | Result | |
|---|---|---|
| Resistance to abrasion | Rub printing with plastic eraser under 500 gm force | more than 2,700 cycles |
| Resistance to key - striking | Strike keytop with 200 gm force at 3.5 cycles/sec | more than 1,000,000 cycles |
| Resistance to peeling off | Peel off by adhesive tape | no peeling off |
| Resistance to fingerprint liquid | Apply synthetic fingerprint liquid for 240 hr at a 40° C 95% RH | no change in printing |
| Resistance to ultraviolet rays | Apply 20W sterilizing ultraviolet ray from 15 cm distance for 72 hr | no change in color |
Physical Properties & Chemical Resistance
Physical Properties
| Specific Gravity at 25° C: | 1.10 to 1.20 |
| Material Hardness: | 50 to 90 ± 5 Shore A |
| Tensile Strength: | 60 to 90 Kg/cm |
| Elongation: | 200 to 500% |
| Tear Strength: | 15 to 20 Kg/cm |
| Compression Set: | 50 to 60% |
Chemical Resistance
| Keypads can be safely exposed to the following materials: |
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Electrical Specifications
| Contact Resistance: | <200 Ohms at 120V DC, 300 mA |
| Actuation Force: | 80 to 150 grams ± 25 grams |
| Operation Life: | >1 x 106 cycles |
| Contact Bounce: | 15 ms typical |
| Contact Loading: | 12V DC/10mA max |
| Travel: | 0.8 to 1.0 mm typical |
| Operating Temperature: | -40 to 250° C |
| Storage Temperature: | -50 to 250° C |
| Volume Resistively: | 6 x 1014 ~ 1 x 1016 Ohm-cm |
| Dielectric Strength: | 24kV/mm of thickness |
| Dielectric Tangent: | 13% (50 Hz) |
| Dielectric Constant: | 2 to 3 MHz |
| Insulation Resistance: | 100 Megohms/250V DC |
| Insulation Breakdown: | 26K/mm |
Contact Pills (All Dimensions in mm) - Standard Sizes /Standard Sizes
| Standard Sizes | |||
|---|---|---|---|
| Silver | White/Carbon | Stainless-Steel | Gold |
| Round | Round | Round | Round |
| 1.5 | 2.0 | 3.0 | 3.0 |
| 2.0 | 2.5 | 3.5 | 4.0 |
| 2.5 | 3.0 | 4.0 | 5.0 |
| 3.0 | 3.5 | 5.0 | |
| 3.5 | 4.0 | 7.0 | |
| 4.0 | 4.5 | ||
| 4.5 | 5.0 | ||
| 5.0 | 6.0 | ||
| 6.0 | |||
| (Custom Size Contact Pills Available) | |||
| Contact Pills (All Dimensions in mm) - Standard Sizes | ||||
|---|---|---|---|---|
| Carbon | ||||
| Oval | Round | |||
| 1.5 x 5 | 2.5 x 6 | 4.0 x 14 | 1.5 | 5.5 |
| 2.0 x 3.5 | 2.5 x 11 | 4.0 x 15 | 2.0 | 6.0 |
| 2.0 x 4.5 | 3.0 x 5 | 4.0 x 16 | 2.5 | 6.5 |
| 2.0 x 5 | 3.0 x 8 | 4.5 x 8 | 3.0 | 7.0 |
| 2.0 x 6 | 4.0 x 6 | 5.0 x 7 | 3.5 | 7.5 |
| 2.0 x 12 | 4.0 x 7 | 5.0 x 14 | 4.0 | 8.0 |
| 2.5 x 4 | 4.0 x 8 | 6.0 x 10 | 4.5 | 8.5 |
| 2.5 x 5 | 4.0 x 11 | 5.0 | 9.0 | |
| 10.0 | ||||
Diagrams
Force vs. Resistance More force-lower resistance Less force-higher resistance |
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Contact Resistance Branch
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