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Background Furan resin self-hardening sand is very hard and easy to control, and the dimensional accuracy of castings is high. Therefore, the self-hardening resin sand process has been used to cast various metal castings, such as machine tools for...
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1. Why is phosphoric acid used as a curing agent for high-nitrogen furan self-hardening resins, and rarely as a curing agent for low-nitrogen furan self-hardening resins? This is because the low-nitrogen sterol resin, when using an acid as a curing...