树脂砂主要采用石英砂,即硅砂。硅砂是应用最广的造型材料,但树脂砂对原砂有更严格的要求。如西德、意大利采用同样树脂砂,西德用的石英砂含SiO_2高达99.8％,树脂用量0.9％,成本6.39英磅/吨,而意大利用的石英砂含SiO_2 90.25％,树脂用量2.5％,成本19.75英磅/吨。可见,含SiO_2高的树脂砂经济效益好。此外,原砂质量还直接影响固化剂加入量以及树脂砂的硬化速度、强度、溃散性、重复使用性和环境条件等,故国内外对树脂砂用的 Resin sand mainly uses quartz sand, namely silica sand. Silica sand is the most widely used modeling material, but the resin sand on the original sand have more stringent requirements. For example, West Germany and Italy use the same resin sand. The silica sand used in West Germany contains up to 99.8% of SiO 2, the amount of resin is 0.9% and the cost is 6.39 lb / ton. Italian quartz sand contains 90.25% of SiO 2 and 2.5% The cost of 19.75 pounds / ton. It can be seen that the resin sand with SiO_2 is high in economic efficiency. In addition, the quality of the original sand also has a direct impact on the amount of curing agent added and resin sand hardening rate, strength, collapsibility, reusability and environmental conditions, it is used at home and abroad resin sand