精品无码成人网站久久久久久,日韩内射美女人妻一区二区三区,久久精品国产精品亚洲,无码专区永久免费av网站,国内精品久久久久久不卡影院,亚洲成AV人综合在线观看-99MIAV-J

Glass sand is divided into various types by sieving after ordinary glass is broken

2020-04-20 11:42:38 3033

When we talk about glass beads, we all think of the kind of glass marbles we talked about when we were young. Modern glass beads are really widely used for scratches, such as clothing, evening dresses, shoes, hats, handbags, headdresses, wool textiles, bead embroidery, lighting, handicrafts, etc. Today, let's take a look at the general situation of modern glass beads.


Generally, glass beads are also called glass sand. The glass sand is divided into various types by the sieve after the ordinary glass is broken, which is irregular shape. Glass beads are made by sintering glass sand in an air furnace, most of which are in the shape of a round ball.


精品无码成人网站久久久久久,日韩内射美女人妻一区二区三区,久久精品国产精品亚洲,无码专区永久免费av网站,国内精品久久久久久不卡影院,亚洲成AV人综合在线观看-99MIAV-J