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What are Carbon Pills in Rubber Keypads?
A typical silicone rubber keypad involves designing a flex wall around the perimeter of the button. When the key is pressed, the flex wall flexes and produces a tactile response (similar to a spring). When the key is fully pressed, the flex wall allows the center of the key to make contact with the circuit.
In rubber keypads, there are typically two methods of making contact with the actual switch: dome switches or conductive carbon pills. Conductive carbon pills are typically manufactured from a silicone conductive material that contains carbon. Conductive pills are molded into the actuators of the keys. When the carbon pill makes contact with the circuit, it is closing the circuit on a printed circuit board or flexible circuit trace.
Conductive carbon pills are usually silicone based and can be round, oval, or rectangular in shape. Carbon pills can range in size depending on the size of the key but typically available from 2.0mm to 10.0mm in diameter. Multiple carbon pills can also be utilized and designed into the part to ensure solid contact is made depending on the key shape, size and design of the keypad.
Our company Xiamen Better Silicone Rubber Co.,Ltd is specializing in making molding and produce different types of silicone rubber keypads and switches. Rubber Keypads, as a reliable switches components, which is widely used in remote control, medical device, wireless communication device & equitment, electronic calculator etc.
Silicone Rubber Push Button Design Structure
1. Silicone Button & Key
2. Silicone Button Pads,
3. Button & Key flexible webbing
4. Button & Key Travel
5. Carbon Pills & Graphite Pads (Conductive Materials)
Silicone Push Button Surface Symbols & Icons
1. Screen Printing
2. Laser Etching (Legends for LED backlight)
3. Embossed & Debossed Molded Symbols
Silicone Push Button Surface Protection
1. Matte Smooth Coating
2. PU Coating
3. Epoxy Coating
4. Silicone Key with Plastic Button Cap
5. Silicone Key with Metal Button Cap
Notes: PU coating is more wearproof, and protective effects is better than matte smooth coating. However, PU coating is more expensive than matte smooth coating.
And also matte smooth coating have good tactile effect, PU coating is not too hard and not good tactile effect. Most silicone rubber keypads choose matte smooth coating.
Silicone Rubber Push Button Conductive Materials
1. Graphite Pads & Black Carbon Pills
2. Electrically Conductive Printing Ink
3. Metal Domes
4. Golden Pills & Copper Pads
5. Nickle Pills
| Life Time | Resistance | Diameter | Thickness | Advantage | Disavantage | |
| Carbon Pills | Above 10 Millions | 10-100 Ohms | 1.5-8 mm | 0.2-0.6 mm | Lower Resistance Stable Life Time | Shape Limited |
| Conductive Ink Printing | Above 10 Millions | 50-350 Ohms | Available | 10-20 Microns | Any Shape is Available | Resistance Limited |
| Metal Domes | Above 10 Millions | 1-100 Ohms | Available | 0.05mm-0.1mm | Lower Resistance | Bad Tactile Feel Without Dust Free Functions |
| Metal Pills | Above 10 Millions | 1-100 Ohms | Available | 0.05mm-2mm | Lower Resistance | Low Production Efficiency High Unit Price |
Silicone Push Button Designers or Manufacturer Notes:
Silicone Keyboard Designers or Manufacturers, not only in consideration of actuation force and silicone rubber keypads structure like silicone buttons travels, keypad conductive materials, silicone rubber buttons webbing, but also should in view of silicone surface & materials demands, like symbols & icons, protective keyboard cover, silicone keypads materials choice &transparency, hardness, color spraying coating.
Xiamen Better Silicone Rubber Co.,Ltd is your reliable and professional keypads & keyboard manufacturer and suppliers. Silicone Rubber Keypads production technology and professional service is our advantage: Save your money and time.
Custom Keypad Drawing Information
