发明授权
US4445565A Process for preparing cores and molds 失效
制备核心和模具的工艺

Process for preparing cores and molds
摘要:
A combination binder and hardener therefor for a foundry aggregate wherein a linear metal polyphosphate or ammonium polyphosphate is used as the binder, the hardener is a mixture of phosphoric acid and a source of polyvalent metal cations.
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