硅酸钠能使软木粉粘结在模具表面，而且还有助于软木粉耐受熔融铅合金的碳化作用。
The sodium silicate makes the cork stick to the mold surface and also helps to withstand the charring action of the molten lead alloy .
硅酸钠能使软木粉粘结在模具表面，而且还有助于软木粉耐受熔融铅合金的碳化作用。
The sodium silicate makes the cork stick to the mold surface and also helps to withstand the charring action of the molten lead alloy.
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