RE:Does HC know about this<<< ZGS/Trebor mask was subjected to an extensive testing and verification process by indepandant labs before being submitted to HC who certified and promptly barred from use before a single mask hit the shelves. >>>
By chance, did ZGS/Trebor perform any testing to determine whether or not any graphene nanoparticles would end up in the lungs of those who wore the masks on a daily baisis?
The U.S. requires FDA approval of graphene coated masks.
So far, none have been approved.