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Views: 357 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.
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
2. Common conductive carbon pills materials
Raw Materials | Material Ratio |
110-Z Methyl Ethyl Silicone Rubber | 60% |
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<100Ω，Metal pill<1Ω，Silver powder pill<10Ω |
Hardness | 70±5 |
Thickness | 0.3-0.4, 0.4-0.5， 0.5-0.6， 0.6-0.7， 0.7-0.8， Tolerance:±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 pressure，temperature 170℃±10℃.
|
Store Period | 36 months available under dry area |
4. Diameter Dimension
Carbon Pill Dimension | <Ф3 | Ф3-4 | Ф4-5 | >Ф6 |
±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% |
