For a rigid, self-supporting connection.– According to DIN 12249 Form E – Ground (finer grinding quality, less roughness depth) – The finer surface reduces the risk of jamming the cuts – Minimized grease requirement – Very low leakage rate – Tight closure due to standard ground joint – Glass articles for further processing For a rigid, self-supporting connection.– According to DIN 12249 Form E – Ground (finer grinding quality, less roughness depth) – The finer surface reduces the risk of jamming the cuts – Minimized grease requirement – Very low leakage rate – Tight closure due to standard ground joint – Glass articles for further processing