It is important to know that the shape of the sand has an important impact on the surface finish of the casting. Circular sand is better than triangular sand because the triangular sand has a large gap, which is easy to lead to defects such as porosity; According to the nature of the casting, the sodium silicate quartz sand is selected to form a spalling layer, and combined with the characteristics of cooling and shrinkage of the casting, the surface defects are reduced. Coating a protective layer on the surface of large castings, such as the film on a coated sand mold, can improve the surface finish of the sand mold and reduce the surface defects of the casting.
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2025-08-15 07:07
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They teach young girls to embrace challenges, to not let a little rain dampen their spirits They teach young girls to embrace challenges, to not let a little rain dampen their spirits
Designers have embraced this trend, introducing a myriad of colors, patterns, and textures, transforming the traditional gumboot into a fashionable accessory that reflects individuality Designers have embraced this trend, introducing a myriad of colors, patterns, and textures, transforming the traditional gumboot into a fashionable accessory that reflects individuality
So why not take advantage of this opportunity to refresh your shoe collection?
With waterproof boots, women can confidently navigate through winter landscapes, whether it's city streets after a rainstorm or a countryside path covered in fresh snow With waterproof boots, women can confidently navigate through winter landscapes, whether it's city streets after a rainstorm or a countryside path covered in fresh snow