Re: Hard Anodizing
There is benefit to type III anodizing for certain applications if it is a true type III. Type II can be grown with the small pore size and thickness similar to type III and would be hard to tell the difference without going to a lab. The setup cost and difficulty for type II is less than type III (excluding the oxalic which I'm not familiar with). If you like, I could anodize a test piece for you to run through the paces and see if the type II would do the job. If interested just email me.
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