ALSEAL 521
![](http://img4.11467.com/2020/10-16/3675384058.jpg)
Alseal521采用了更精细的混合铝粉比Alseal519,提供更平滑的表面光洁度
Alseal521 uses a finer mixed aluminum powder than Alseal519, providing a smoother surface finish
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Alseal521采用了更精细的混合铝粉比Alseal519,提供更平滑的表面光洁度
Alseal521 uses a finer mixed aluminum powder than Alseal519, providing a smoother surface finish