The quality of bentonite has a key effect on the formation of sa nd inclusion and scab,and also has important effect on the formation of some ot her defects of castings.

• 膨润土的品质对铸件是否产生砂孔、夹砂等缺陷起关键的作用,对铸件的其他缺陷也有重要影响,因此应当重视膨润土的检测。