Views: 44 Author: Site Editor Publish Time: 2020-12-21 Origin: Site
DongChen is a professional custom metal dome manufacturer in China, our production technology guarantees that even after the strict overload test.
| Metal Dome Technical Specification Sheet | |||
| No. | Technical index classification | General technical indicators | Corresponding testing equipment |
| 1 | Life of metal dome | Round | GP-RA-500-3 Life Tester |
| 1. Can hit 1 million times; | |||
| 2. After 1 million tests of Force and Click Ratio, compared with the initial value, the rate of change is <30%; | |||
| Waist round | |||
| 1. The industry requires 500,000 times, and our company performs inspections according to the requirements of 1 million times; | |||
| 2. After Force and Click Ratio are tested 500,000 times, compared with the initial value, the change rate is <30%; | |||
| 2 | Custom metal dome shape | Round/waist round/quadruple/triangle/abnormal | / |
| 3 | Force/Click Ratio | . Force: 100gf~300gf; (Tolerance: ±20gf) | Manual or S205 load curve tester |
| . Click Ratio: 50±15% (normal) | |||
| 4 | Metal dome stroke | 0.13~0.22mm (different due to different specifications of shrapnel) | S205 load curve tester |
| 5 | Metal dome size tolerance | . Tolerance of feeding shrapnel: +0, -0.05mm (normal) | JT-300A projector |
| . Tolerance of positioning aperture: +0.05mm; | |||
| . Shape tolerance: ±0.1mm; | |||
| . Dome to Dome center tolerance: ±0.13mm; | |||
| . Tolerance between positioning hole and Dome center: ±0.15mm; | |||
| . Tolerance from positioning hole to positioning hole: ±0.1mm; | |||
| 6 | High temperature and humidity | 85±5℃, place 48H at 90% R.H., and restore 2H at room temperature after the test. | LTH-A-80 programmable constant temperature and humidity testing machine |
| 7 | Salt spray test | The temperature is 35±2℃, the salt solution concentration is 5±1% (mass percentage), and the time is 24±1 hours. The salt deposits after the test are washed away with water; | Salt spray test machine |
| 8 | Thickness of nickel plating on the surface of shrapnel | 0.2~0.3μm; | / |
| 9 | Initial force test of glue | 4↑(Unit：No/Ball) | Rubber initial force tester |
| 10 | Rubber retention test | 8↑(Unit：hr/kg*inch) | Adhesive material retention tester |
| 11 | Adhesion test of adhesive | 0.6↑(Unit：kgf/inch) | Adhesive Tester |
| 12 | Rubber shrinkage | MD(%):0.5 ↓ CD(%):0.3 ↓ | Shrink oven |
| (Unit：100℃*40mins) | |||
| 13 | Static shielding net resistance | ＜1Ω, 2Ω, 3Ω; (full screen/grid-like two ways) | TH2511 DC low resistance tester |
| 14 | Momentary contact resistance | ＜1Ω | |
| 15 | Shielding net hardness test | 2H pencil | / |
| 16 | Shielding net adhesion test | 3M800#Test tape | / |
| 17 | Total height of Metal Dome | 0.28~0.305mm (conventional) | Thickness gauge |
| 18 | Total thickness of substrate | 0.05mm, 0.075mm, 0.1mm, 0.125mm; | Thickness gauge |
| (The above 4 thicknesses are common) | |||
| 19 | Dimple point selection | The number of dots on the concave surface of the shrapnel; | / |
| 0/1/3/4/5 points; | |||
