Thanks guys! This laminate is copper clad. Has anyone had any dealings with it? I'd really hate to screw it up. It cost about $10/sq ft. I tried to talk the customer out of it but it's what she wants.
Now, this one is new. Do you have a supplier's name pls? I also note that the electronics industry uses acid etching on copper so I hope she's not expecting to cook with lemons or use chlorine powders to clean the copper.
I would have some concern about the effectiveness of using a router bit, even carbide, on thin copper. I would recommend a small piece of experimental laminate be "sacrificed" for the good of the whole -- your hide is what I'm referring to. Copper will offer some temperature resistance but I'm thinking that maybe the bit temperature might be too high if the feed rate is too slow.
Now, don't take me literally. I'm overly cautious on stuff that I've had no experience with and even then I try to learn from others, just like you're doing. However, there must be some reason that professional kitchens don't use copper but stainless steel, instead. Even copper brewery kettles are lined with glass.
Are you using some sort of lacquer to coat the copper? I'd be prepared with some options in the near future. The first time she puts a hot pot on it, she'll be knocking at your door for an "instant fix" to the damage. You might consider it prudent to go out and buy some inexpensive (nay cheap) trivets and present them with the counter as your "thanks for her custom" gift.
My musings -- interesting predicament -- looking forward to hearing of your solution(s.)