Schaltmatten_Keypads

RUBBER KEYPADS
MATERIALS / MANUFACTURING
SILICON RUBBER
FEATURES
Silicone rubber is a synthetic rubber compound that possesses the most desirable properties of both organic and inorganic
materials. It has a man made chain of siloxane linkages Si-O detailed below:
CHARACTERISTICS
The data in the tablebelow is representative of standard performance material used in the manufacture of conductive rubber
keypads.
Contact us for more information on high performance material if your application requires higher grade material than what is
listed.
Physical Mechanical and Electrical Characteristics of Silicone
Physical Characteristics
Conductor
carbon pill
Insulator
silicone
94 HB
UL Flammability Rating
Specific Gravity at 25C 1 1.1 - 1.4
Durometer (Shore A) 65 ±5 40 - 80 ±5
Tensile Strength (Kg/cm 2 ) 70 55-75
Compression Set %* 20 11-22
Insulation Breakdown
26k v/mm
Volume Resistivity 5 3x10 14 -10 15
Mechanical Characteristics
Key Stroke
0.0 - 5.0 mm
Actuation Force
20 - 500 grams
Operating Life
500K actuations (typical)
Operating Temperature
-20 +70 o C**
Storage Temperature
-40 + 250 o C**
Electrical Characteristics
Contact Resistance
100 Mohms
Contact Bounce
1 min. @ 500 V RMS
* After 22 hours at 175 o C
** To convert degrees Fahrenheit to degrees Centigrade use formula: o F-32
1.8
*** Based on gold or nickel-plated printed circuit board.
digital electronic gmbh Tel. +49 (0) 8221-708-0 Fax +49 (0) 8221 708-80
www.digitallehrer.de digital@digitallehrer.de
All specifications subject to change without notice.
3