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KEYPADS

Thank you for considering Nascent Silicones for your rubber keypad projects.

Our sales team offers outstanding customer service through out the design and production of your system interface. Our engineering and design teams can deliver creative insight on emerging technology utilized in rubber keypad manufacturing. We provide the silicone rubber keypad manufacturing expertise necessary to manage your requirements from conception to completion.

We can custom design and produce all types of silicone rubber keypads using compression moulding process. Our engineers can design and cut molds to meet any customer’s requirements.

Complete engineering consultation design services are available.

Silicone rubber keypads are the most widely used form of switch technology today. They offer reliability, long life and design flexibility. Conductive rubber switches and keypads were originally developed for the electronics industry to meet the increasing demand for inexpensive momentary switches. Conductive rubber keypads became desirable because they look and feel like traditional push-button style switches, but do not have their inherent disadvantages. Since their introduction over 30 years ago, conductive rubber switches and keypads have gained enormous popularity and wide-range acceptance because of their reliability, long operational life and excellent tactile feel.

We have the capability to supply whatever is needed when conductive rubber keypads or switches are being designed into a given product. All of our keypads meet the industry’s most rigorous standards for quality and performance. Although about 99 percent of our keypads are custom made, a limited number of off-the-shelf products are available for purchase without tooling charges.

Innovative key coatings for our silicone rubber keypads are silicone, parylene, and Dura (Hard Coat). Silicone rubber keypads can be designed for applications exposed to water and hydrocarbons. Enhanced graphics and lighting options allow your product to incorporate features not found on standard silicone.

Silicone Rubber Benefits
Silicone rubber is an excellent choice for device operation controls. It possesses the following characteristics;
• Excellent resistance to both heat and low temperature (-55° C to 250° C)
• Minimum noise generation due to soft and elastic contact structure
• Minimum abrasion and high resistance to SO2 and oxidation even in heavy humidity

In addition, silicone rubber offers several features that make its design and usage flexible;
• Design both tactile and linear feedback
• Translucent materials available
• Cost effective
• Multi-color designs easily accommodated
• Water and contamination resistant

BASIC LEGEND DESIGN
Key design will vary with the functional and aesthetic requirement of the application. Several of the available legend types are described below.

PLASTIC & RUBBER ASSEMBLIES
Plastic molded and rubber base assemblies allow a wide range of design capabilities for high end products at a low cost as well as ease of product assembly. Many variations available including, laser etch as well as 2-shot (chrome plating & translucent) options. Various protective overcoats including soft type available.

POLYDOME/METAL DOME
We can assemble any type of rubber, plastic/rubber keypads with either metal or polydome. This option is best suited when a one piece, thin low cost assembly is required.

SCREEN PRINTED LEGENDS - The most common and least costly legend identification method.

COATING OPTIONS
Screen Printed Coating - Full coverage of keypad top surface with ink (overcoating).
Silicone Spray Coating - Additional silicone. Matt & Glossy finish available.Applications in consumer & automotive industries
Polyurethane Coating – Protects surface from oils, dirt, and contamination. Can be applied as a glossy or matte finish. Coating deposited on the top surface of the key over printing. Used when applications call for a higher abrasion or Plastic Feel. Typical applications include automotive and point of sale hand held devices.
Parylene Coating - Protects surfaces from oils, dirt and contamination. Creates a matte finish. Reduces surface tack and stickiness. Prevents flaking or dusting of the elastomer surface. Resists chemical attack from organic solvents and inorganic reagents, acids, or saline solutions. Deposited as a gas at the molecular level for a high degree of coating confomality and equivalent coating thickness deposit (approx. 1 micron or less).
Epoxy Capping (Encap) - Depositing an epoxy resin(approximately 1.00 mm thick ) on the top of each key. This process simulates an in-molded keycap and provides a value added 3-dimensional look in addition to extending the life of the graphics.). Enhances legend. Most widely used in high use point of sale hand held type devices.

Type of Coating

Effect on Longevity

No Coating

-

Screen Print Coating

2 Times the Life

Silicone Spray Coating

3 Times the Life

Polyurethane Spray Coating

4 Times the Life

Parylene Coating

10 Times the Life

Epoxy Capping (Encap)

20 Times the Life

Typical Keypad Specifications
Characteristics

Conductor

Insulator

Material

Carbon Pill

Silicone

Durometer (Shore A scale)

65 +/-5

30-80 +/-

Tensile Strength (kg/cm 2 )

60

65-85

Tear Strength (kg/cm)

15

10-15

Compression set (%)

20

11-22

After 22 hrs at 175° C
Specific gravity at 25° C

1.18

1.11-1.18


Mechanical Characteristics

Typical Measure

Key Stroke

.25-5.0 mm

Actuation Force

125-150 grams

Operating Life

1 million + Actuations

Operating Temp

-30 - 180 C

Storage Temp

-42 - 250 C


Contact Resistance

<100 Ohm at 12V dc 30mA

Strength 20-25kv/mm
Constant 26-35 MHz

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

-


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 10% Sulfuric Acid

Electrical Specifications

Contact Resistance

<100 Ohms at 120V DC, 300 mA

Actuation Force 20 to 150 grams ± 25 grams
Operation Life >1 x 106 cycles
Contact Bounce 15 ms typical
Contact Loading 12V DC/10mA max
Travel 0.5 to 2.5 mm typical
Operating Temperature -40 to 250° C
Storage Temperature -50 to 250° C
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

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

All of our conductive rubber switches and keypads meet the industry's most rigorous standards for quality and performance. Furthermore, our team is committed to providing complete customer satisfaction along with high-quality products and keeping each customer the focus of business.

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