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Durabile Silicone Rubber and Electronic Keypads from Miller Dial

by Tony Losey — last modified 2008-10-14 10:30

Miller Dial LLC. has been a leading manufacturer of Silicone Rubber Keypads for over 15 years. Complemented by over 68 years of manufacturing experience, our processes and procedures for producing high quality silicone rubber keypads are well proven. You will find our team helpful and creative.

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Rubber Keypads

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 crazed 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. 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.

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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 is #1.

Design | Tolerance | Tactile | Keytop | Physical | Chemical | Electrical
Contact Pills | Standard Sizes | Diagrams

Design

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 minimum 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

Specific Gravity at 25° C: Material Hardness: Tensile Strength: Elongation: Tear Strength: Compression Set:	1.10 to 1.20 50 to 90 ± 5 Shore A 60 to 90 Kg/cm 200 to 500% 15 to 20 Kg/cm 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: Actuation Force: Operation Life: Contact Bounce: Contact Loading: Travel: Operating Temperature: Storage Temperature: Volume Resistively: Dielectric Strength: Dielectric Tangent: Dielectric Constant: Insulation Resistance: Insulation Breakdown:	<200 Ohms at 120V DC, 300 mA 80 to 150 grams ± 25 grams >1 x 10⁶ cycles 15 ms typical 12V DC/10mA max 0.8 to 1.0 mm typical -40 to 250° C -50 to 250° C 6 x 10¹⁴ ~ 1 x 10¹⁶ Ohm-cm 24kV/mm of thickness 13% (50 Hz) 2 to 3 MHz 100 Megohms/250V DC 26K/mm

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