The abrasive material used may be a synthetic grit a ground slag ground corundum iron or steel shot. It must not contain sand or any form of silica.

• 采用的磨料可以是合成粗砂、粉末矿渣、粉末金刚砂、铁或钢粒。磨料中不得含有沙或任何形式的硅。