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在呋喃树脂砂工艺中可以使用含碳量为1.3%(甚至更高)的低回收标准的再生砂。实际的回收率可达75%~80%。铸型和型芯使用铬面砂的必要性的主要判据是铸件的壁厚。涂刷涂料可以获得壁厚达70mm的无粘砂的铸钢件。
In the furan resin sand process can be used with carbon content of 1.3% (or even higher) low recovery standards of recycled sand. The actual recovery rate of up to 75% to 80%. The main criterion for the necessity of using chrome-side sands for molds and cores is the wall thickness of the castings. Brush coating can get the wall thickness of 70mm non-stick sand castings.