Are aluminum hard hats legal under current ANSI regulations?

No, aluminum hard hats are not compliant with current ANSI regulations. The American National Standards Institute (ANSI) specifies that hard hats must be made from materials that provide adequate protection against impact and electrical hazards, and aluminum does not meet these requirements. As a result, only hard hats made from approved materials like high-density polyethylene (HDPE) or fiberglass are considered legal and safe for use in workplaces requiring head protection.