Each piece of RASSON SLATE raw material comes from the best quarries, and strictly selected by the purchase department. The slate only up to the standard can be allowed forwarding RASSON SLATE factory for processing.There two patterns of our slate raw material. One is square raw material with large structure, the other is the large area with flaky structure. The properties of the above-mentioned are the same while in different exploiting way. The are respectively processed to be the required thickness with diamond big disc sawing machine and planing machine, the take the next step.