Button Cover & Cap
Button Cover, also called Button Cap & Plastic Keycaps, Key Caps, which used as a switches cover in aim to anti-dust, oil proof, wear-resisting, good aesthetic & backlight effects and long lifespan etc.
Silicone Keypads with plastic button cover, which is bonding by glue or under-cut (hook), not only make use of plastic key caps materials advantage, but only take full advantage of elastomeric and sealing feature of silicone rubber materials. 
Plastic Keycap ( key covers) Materials: PC. PMMA & Acrylic, PVC, ABS, ABS+PC ect. Plastic Key Caps & Cover 's Legend types:
1. Screen Printing
2. Laser Eteched (color spraying coating and laser engraving for led backlight.)
3. Overmolded legends (silicone & LSR + plastic overmoding for backlight)
Plastic Button & Key Cap legends' protective Coating: UV coating or PU coating (Glossy or Matte Smooth), mainly depends on keycap working environment.
Button Cover Silicone Rubber Keypad Production Process
1. Plastic Button Caps's injection mold-making, production and aided tooling-making
2. Silk screen printing, Or spraying coating+ laser etched, and do PU or UV coating.
3. Die Cutting for plastic button caps.
4. Assemble keycap and silicone keyboard by glue.
5. Rapid bonding or drying process combinantion
Silicone Rubber Keypad with plastic caps
Advantages:
1.) Good aesthetic and backlight effects.
2.) Good Touch Feeling, Anti-dust.
3.) Cost effective to large quantities.
3.) Long lifespan keypad
2. Disadvantage.
1.) High injection mold-making cost: If choose PC/PMMA materials and up to light guide effects,
that need choose good mold core steels.
2.) High Keycap Demands: No flowing mark, no texturing and up to light guide effects.
That need good injection machines and injection standard parts.
3.) Unsuitable to low quantities.
