According to the hole rate: solid brick (brick without hole or hole less than 25%), porous brick (hole rate equal to or greater than 25%), small size and number of holes, often used for bearing parts, high strength grade. Hollow brick
- Oct 12, 2018-
According to the hole rate: solid brick (brick without hole or hole less than 25%), porous brick (hole rate equal to or greater than 25%), small size and number of holes, often used for bearing parts, high strength grade. Hollow brick