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.
...
2025-08-16 04:46
2417
With a coated tomato cage, you can rest assured that your plants will remain upright and healthy throughout the growing season With a coated tomato cage, you can rest assured that your plants will remain upright and healthy throughout the growing season
In contrast, buildings with a more robust structural frame, such as concrete or steel, may allow for wider spacing of the ties In contrast, buildings with a more robust structural frame, such as concrete or steel, may allow for wider spacing of the ties
These panels can be used to create trellises, partitions, and even decorative features in garden beds These panels can be used to create trellises, partitions, and even decorative features in garden beds
