That the

• ordinary (no more than 30%).

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• improved (no more than 25).

• cuboid (no more than 15%).

When buying crushed stone, it is very important to pay attention to the presence of clay particles, the size of which is less than 0.06 mm. If there are a lot of them in percentage, then this significantly reduces the overall quality and technical parameters of crushed stone. For example, we should not forget that the maximum strength of clay content in lumps should be less than 0.25%. For brands M200 and M400, this value should be no more than 3%