Silicone Keypad for Car Phone

Car Phone Keypad, Backlight and Dome Array Assembly.

1). General purpose silicone in translucent( or milky) for molding the blank.

2). Spray painting in multi-color layers.

Basic colors: White and Black.

White isfor the graphics.

Black is for the light mask.

3). Forming the backlight graphics by laser etching.

4). Light box inspection in a dark room for the graphics backlight and the keypad light leak(bad light mask).

5).Surface coating for protection.

a). Silicone matte(SM) coating for a comfortable touch feeling.

b). PU matte coating for a good worn/abrasion proof(RCA tester).

Above 400 continual cycles with 175 grams load guaranteed!

c). Adds Uv-Proof material on the above a) or b) to stop the white graphics becoming yellowish for the outdoor application(Marine, GPS, Military…).

HIGHTLIGHTS:

The following silicones are not suitable for a backlight keypad.

a). Fluorosilicone(FSR), due to the standard FSR color is light yellow or white( There is a transparent FSR on market, but the price is sky).

b). Flame retardant silicone, especially for UL94-V0 grade silicone, due to the color is off-white.

To improve the key cycle life, no broken for the web, a high tear silicone can be added into the molding recipe.

The force/tactile will be fulfilled by a metal dome array.