antiquated sand
... 防缩剂|冒口保温用^anti-piping compound 老化砂^antiquated sand 砧台式震实造模机^anvil-jolter ...
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老化现象模砂 deteriorationphenomenon
介绍水玻璃粘结剂容易“老化”的原因和老化现象对水玻璃砂性能的危害，提出水玻璃粘结剂改性的方法与应用效果。
This paper introduces the cause of the easy aging of sodium silicate binder and the harm of its aging to the sand nature, and puts forward the methods and effects of sodium silicate binder modifying.
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