Xiamen Better Silicone Rubber Co., Ltd

Carbon Pill

Views:200     Author:Sunny Ou     Publish Time: 2017-06-19      Origin:www.better-silicone.com

Graphite Pads & Carbon Pills

Conductive silicone rubber keypad with carbon pill or graphite pads which is widely used in electronic products as a switches components.

graphite pads.jpg


Following is mainly talking about carbon pills production engineering

1. Process flow of conductive carbon pills.

110-Z Methyl Ethyl Silicone Rubber + Acetylene Carbon →Mixed→Compression Molded ( first vulcanization)→ Drying in the Oven ( second vulcanization) →Die Cutting for different shaped → Cleanout→Drying →Quality Test→Packaging


carbon pill.jpg


2. Common conductive carbon pills materials

Raw Materials

Material Ratio

110-Z Methyl Ethyl Silicone Rubber

60%

Acetylene Carbon

40%

Notes: Different conductive metal materials and different ratios have different resistance.

3.

Items

Standard

Take off black

Using 3M800 # stickers to pull , but not fall black

Resistance

Carbon pill<100ΩMetal pill<1ΩSilver powder pill<10Ω

Hardness

70±5

Thickness

0.3-0.4,  0.4-0.50.5-0.60.6-0.70.7-0.8Tolerance:±0.1mm

Appearance

No flash,burr,brush,serration. ≤0.05mm

Lifetime

21V---0.3AF>100,000 hitting. No burning of carbon pills, and resistance meets specifications.

Adhesive Bonding

Completely adhesive with silicone rubber in 60 seconds under up 100T pressuretemperature 170℃±10℃.

 

Store Period

36 months available under dry area

 

conductive carbon pill keypad.jpg

Conductive rubber keypad.jpg

4. Diameter Dimension

Carbon Pill Dimension

<Ф3

Ф3-4

Ф4-5

>Ф6

Diameter Tolerance

±0.05

±0.05

±0.05

±0.05

Diameter Positive Tolerance

±0.07

±0.07

±0.07

±0.08%

Diameter Negative Tolerance

-0.07

-0.07

-0.07

-1.2%

 

 


Better Silicone Keypad

Xiamen Better Silicone Rubber Co., Ltd is specialized in designing and manufacturing all kinds and configurations of Silicone Rubber Keypads for a wide range of applications....  
 

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