水洗砂（Washed-out sand）

 水洗砂为天然硅砂经水洗、分级的铸造用原砂，含泥量（质量分数）≤ 1.0%。详见GB/T 9442-1998。

Sand washing after washing for natural silica sand, sand castingwith the classification, mud content (mass fraction) 1.0%.