EL CENTRO, Calif., July 08, 2024 (GLOBE NEWSWIRE) -- Premier Graphene, Inc. (OTC PINK: BIEI) announced today that it shipped HGI’s proprietary graphene suspension test samples to one of the largest essential materials companies in the world for use in concrete. This essential materials company is adding graphene samples to concrete to confirm the game changing improved qualities of this concrete as measured by HGI’s in-house tests. Premier Graphene Inc. has exclusive distribution rights in the United States ...