The decrease in strength of sand cores can be reduced by adding an anti-moisture agent or increasing proportion of polyisocyanate in the mixture when the cores is stored up ...

• 为减少砂芯在湿度较大环境中存放时的强度下降，可在混砂时加入抗湿剂或增加粘结剂中聚异氰酸酯的比例。