Pretty much any material, even cotton, would provide protection from hot metal at that temperature. The problem he will have is that no material will keep his hands cool for two hours of exposure to that temperature. My advice would be to look for a glove that gives him the sensitivity he requires and try a few. Cotton, neoprene, anything that feels right can survive that temperature but nothing short of refrigeration will keep his hands cool for two hours of continuous exposure to that temperature ...
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