Miller Dial

Rubber Keypads

Photo Samples:

RUBBER KEYPAD PHOTO GALLERY >

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Silicone rubber keypads provide an excellent interface to your product. Delivering tactile response and environmental resistance, silicone rubber keypads should be a consideration in designing your next machine interface project.

Our engineering and design teams can deliver creative insight on emerging technology utilized in rubber keypad manufacturing. Our detail-driven Quality department has proven itself as one of our greatest assets, striving to deliver zero defect products, every time. We offer all types and configurations of silicone rubber keypads. PCBs, molded enclosures, and a wide variety of connection types available allow us to provide fast turn-a-round complete assemblies.

Manufacturing Support Services

Our aim is to cater to your specifications, providing insight into available technologies and innovative interface systems. Complete engineering consultation design services are available.

Our manufacturing facilities implement a detailed ISO process with every department involved in your project. Manufacturing of Silicone Rubber Keypads is a competitive marketplace, Miller Dial beats the odds through complete dedication to efficiency and quality. Miller Dial maintains a technical sales staff covering all of North America. Wherever your facility may reside, contact Miller Dial's superior staff to get a quote on your next Silicone Rubber Keypad project.

Manufacturing Facilities

Miller Dial's 100,000 sq ft. facility provides all of the processes required to produce top-notch production runs. Our operations team has designed our manufacturing facility to connect processes at key points for in-production inspection and efficiency optimizations.

ISO Procedures

Many years of ISO certification have contributed to our procedure enhancement programs. Our meticulous Quality team monitors our ISO procedures on a daily basis seeking procedural improvement at each point in the manufacturing process. When problems occur, the Quality team can address them immediately, with thorough root cause analysis techniques. When it comes to quality, Miller Dial can't be beat.

When choosing a manufacturer for your next machine interface, consider a leader in innovation with the years of experience that provide a mature manufacturing process.

Typical Design and Construction


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 Electronic Keypads Electronic Keypads Electronic Keypads Electronic Keypads Electronic Keypads
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:
  • Acetone: 5% Hydrochloric Acid
  • Alcohol: 5% Nitric Acid
  • Mineral Spirits: 5% Phosphoric Acid
  • Mineral Spirits: 5% Phosphoric Acid, 10% Sulfuric Acid

 

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
Operation Times vs. Resistance and Force


More operating times yields lower force and lower resistance

Contact Resistance Branch


- - - - - - - - - Gold plated PCB with C-40P
___________ Tin-lead plated PCB be with "Super-Contact"

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