Common Defects: Etch Non-Uniformity

Both chemistry and metal quality can affect gloss uniformity. It is common to see banding on flat and curved surfaces along extrusion weld lines and opposite flanges. Visible ridges or die lines are also common. Occasionally the etched surface takes on a grainy, or galvanized appearance. All these defects are due to metal quality and/or extrusion practices. Some proprietary etch chemistries are more forgiving to these metal issues than others and are therefore worth trying, but as a general rule, a slower etch with highest possible content of aluminum will give better result than a more aggressive etch.

Etch transfer staining is covered under Stains.

To our best knowledge, the information and recommendations contained herein are accurate and reliable. However, this information and our recommendations are furnished without warranty, representation, inducement or license of any kind, including, but not limited to the implied warranties of merchantability and fitness for a particular use or purpose. Customers are encouraged to conduct their own tests and to read the product labels carefully before using them. Furthermore, the customer assumes sole liability for any patent infringement that occurs by reason of their following our recommendations or using the information given.

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