Oxide happens when casting and if it is molded, it is separated like skin and stain

  happens when anodizing.

   Application of technology: aluminium circle,aluminium sheet,aluminum plate,aluminum   slab, cookware,non stick pan,pot.

Technical guidance about 40 quality problems on the board manufacturing process.

  Melting - casting - homogeneity -rolling - annealing.

  Bubble, coarse grain size, include, oxide, roll crown, crack, ear occurring, Macro structure, etching etc.