Pinhole free film. A surface free from any defects.

无针孔的涂膜，没有表面缺陷的表面。

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Centrifugal casting, compact structure, free from pinhole porosity and slag, smooth surface and even wall thickness.

高速离心铸造，组织致密，无砂眼、夹渣，表面光滑、壁厚均匀。

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