Casting speed directly determines the casting time, and every fused cast block has its own best casting time. Unreasonable casting time can cause many defects in the casting.

Sand mold is a special mold used in casting technology which can make the molten raw material Form a fixed shape. As we know, fused cast series blocks is made through casting method which is melting the material into liquid, and then pouring the liquid material into a sand mold which can withstand high temperature of 1800 degrees. So there are high requirements to sand mold.

1. Material: China refractory material of sand mold is made from natural raw materials sand and quartz sand, and quartz sand adopts two kinds of sand which is fine sand and surface sand, and silicon content is above 99%.

2. Sand blinder: Water glass is selected as the sand blinder of sand mold, as water glass has the characteristics of stable quality, low cost, easy to wash, no smell. What is more, sand mold is made by water glass with high pure silica can meet the following requirements:

Good heat crushing strength: there is heat crushing strength produced during the casting process of fused cast series block, which leads to a big temperature difference between inner and outside of the mold. However, sand mold has the stability even if under heating, as the refractoriness of sand is up to 1690 degrees, and its linear expansion coefficient between 20-450 degrees is about 0.03mm/ degree, so it can withstand the static pressure of high temperature molten liquid and do not break down.

Besides, in order to prevent impurity contamination, every piece of sand should be coated with a certain thickness of surface sand.

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