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Metal Dome Technical Specification Sheet

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DongChen is a professional custom metal dome manufacturer in China, our production technology guarantees that even after the strict overload test.


Circle shape metal dome


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;


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