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Almost all metal mesh material from any source has Zinc in the underlying metal. The only kind that does not have zinc in it is stainless steel.
Question.... I was looking at your photo's and the site you posted. By the way your creation is awesome! Any ways what is the ZINC they are talking about in the dog pens????Or did you use the coated one? I would like to make one in a few months. Thanks a Bunch!!
I used the gold ones because the coating is electroplated onto the surface which bonds it directly to the metal and cannot be peeled or cracked off. The coated ones are just that, coated and the coating can be peeled or cracked off if a big bird chews on it and works to get it off. Same as powder coating.
If the bird is a big bar chewer then it might be wise to go with much more expensive stainless steel mesh or cloth.
Something to consider is if your building a large aviary, it is much less likely that a bird will chew on the bars because they do have so much more space along with much more stuff to keep them busy and really don't have a need to chew on the bars like they would in a cage that is much smaller and really doesn't provide the opportunity to move and explore like they can in a large aviary.
My birds have been climbing on the bars for almost 7 years now and all very recent blood work has come back clean for any signs of metal toxicity. I consider it safe.
Zinc is a much bigger hazard when galvanized mesh is used. Here is some info on that topic.