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研究了ｎ粉与ＰＶＡ单独及复合使用后对水玻璃砂初始强度、高温残留强度等性能的影响，结果表明：ＰＶＡ－ｎ型复合溃散剂能大幅度降低水玻璃砂４００℃以上的残留强度，使其具有良好的溃散性。
The effects of n powder and PVA alone and in combination on the initial strength and residual strength of sodium silicate sand were studied. The results showed that the PVA-n type composite ulcer agent can greatly reduce the residual strength of sodium silicate sand above 400 ℃, Make it have good collapsibility.