I. Acceptable standard of original Bosch worn valve caps

1. The QR code is engraved on a white border.
2. The basic color of stamping area is darker. There should be no grindings on the CRI caps’ appearance. The cap color should be purple、brown or light golden.
3. The original caps are coated with hard chromium and look like shiny white. The hard chromium coating of original caps looks thicker under microscope and no grinding lines.
4. The caps should not have any crack or split.
5. The caps with rusty spot or rust pits are not acceptable.

II．Standard sample of the recycling original caps

Qualified: QR code and stamping area in right color and place
Unqualified: The color of stamping area is bright white
Unqualified: The cap is in serious corrosion
Unqualified: Split
Unqualified: white CRI cap
Qualified: The color is right
Unqualified: QR code is wrong
Unqualified: The cap is in serious corrosion
Unqualified: Broken
Unqualified: Its coating looks dark

III．Acceptable standard of CR valve pin

1. Except the largest and smallest outside diameter, the surface of a valve pin is not polished. And their color should be gray or dark gray.
2. The head end and the slot must in arc and no sharp angle. The end face of head is an arc.
3. The tail end to its end face is an arc and no sharp angle.
4. No damages such as serious corrosion, broken, or grinding lines.

IV. The recycling standard for original valve pin

Qualified: The head end and the slot must in arc and no sharp angle. The end face of the head is an arc.
Unqualified: The head end and the slot is not an arc. The end face of the pin head is flat.
   Qualified: The non-polished section is not polished and the color is gray or dark gray.
Unqualified: The pin is broken.
   Qualified: The transition of a pin’s tail end to its end face is an arc and no sharp angle.
   Unqualified: The transition of a pin’s tail end to its end face is not an arc.
   Unqualified: The non-polished section is polished and the color is shiny white.
   Unqualified: The surface of a pin is in serious corrosion.