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分析了加热法比ＣＯ＿２法水玻璃砂强度高的原因，指出充分发挥水玻璃粘结效率的关键在于细化水玻璃凝胶胶粒。并介绍了一种提高水玻璃砂粘结强度的简易方法——热空气／ＣＯ＿２法。
The reason why the heating method is higher than that of sodium silicate sand by CO_2 method is pointed out. The key point to make full use of water glass bonding efficiency is to refine the water glass gel particles. A simple method to improve the bond strength of sodium silicate - hot air / CO_2 method is introduced.