The top sandpaper for challenging metals for example iron or steel is aluminum oxide, though the best sandpaper for softer metals for example aluminum or brass is silicon carbide. In terms of its production, silicon is used generally for a substrate to increase the graphene. But there are actually quite https://www.facebook.com/permalink.php?story_fbid=pfbid0S5kCy9ofdZHP48BK1Hrvo6Pt3k19B6C3UiKxBuAVPiWNcFzDay1yYF1cQ8EJW8J3l&id=61562415773754&__cft__[0]=AZXd1QS2rNIw0qnZk5SlTD4NeGL6ozkZ05OUFZf974x4uy-c_LkoZRNsxLRo7BHhrLw_dUFCvDc9tZE7JkMCRnFLitbS8BucwCZAdgnNsH-HGQu7qS7ch0ZnGuroOqn885RVgQCxYP2ooevu9vI6rYzIlxcWvi0RjlGnvsd5xQe5gYhl70YA4cgtMcB5F_JhGJm0Oxe2VCB19HHzcdQXo-Ky&__tn__=%2CO%2CP-R