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水玻璃砂生产铸钢件过程中，其粘砂不能简单地用机械粘砂与化学粘砂来解释。利用水玻璃砂生产铸钢件 形成易剥离粘砂层这一特征，铸型表面不刷涂料依然可以得到光洁的铸件。
In the process of producing sodium silicate sand castings, the sticky sand can not be simply explained by mechanical sticking sand and chemical sticking sand. The use of sodium silicate sand production of steel casting easy to peel sticky layer of this feature, the mold surface can not be painted brush coating can still get smooth.