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Keypad Design Guide

 


 


 

 

 

 


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%

 

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