Rubber Keypad Design Guide

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Button Travel (mm)

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Typical Effects

Actuation 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

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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

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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

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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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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	-

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Optimize Your Keypad Design

Our detailed guide ensures actuation force & tolerance match your needs. Get started on your high-performance keypad today!

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