垫板

Nickel underplating prevents the migration between tin or gold platings and the base material.

垫板镀镍可防止在镀层与基料之间的移动。

Good plate of paper can be repeated use 3 to 5 times, and then rechange new paper plate.

好的垫板纸可以反复使用3～5次，然后再换的垫板纸。