Amber DURAN® glass ground stopper.– USP/EP UV light protection due to external amber colouration – Very durable and chemically resistant amber colour – All USP Type 1 glass components and therefore suitable for storage of pharmaceutical API materials – All USP glass components and therefore suitable for storage of corrsive and aggressive materials – Tight closure due to standard taper ground joint – Octagonal shaped head Amber DURAN® glass ground stopper.– USP/EP UV light protection due to external amber colouration – Very durable and chemically resistant amber colour – All USP Type 1 glass components and therefore suitable for storage of pharmaceutical API materials – All USP glass components and therefore suitable for storage of corrsive and aggressive materials – Tight closure due to standard taper ground joint – Octagonal shaped head