The disclosure relates to processes for the production and thermal treatment of carbon material, in particular, graphite powders, in an Acheson type oven, using a functional filler comprising graphitic material in particulate form allowing electrical current to flow through the charge. The process is conducted in the presence of a solvent, which enables the preparation of copolymers having both low hydroxyl functionalities and low molecular weights. A projection extends inwardly from a side wall portion of the cover section for engaging the first and second apertures of the base section, wherein the closure mechanism retains the cover section over the base section and securing the packaging container in a closed position. An open and close motion valve and a compensation valve can be configured to constitute a pressure compensation flow control means connected through the second delivery line and the second change over valve group. The methods comprise injecting tracer-labelled PSA or hK2 specific antibodies, visualising PSA or hK2 producing tissue with the aid of a visualisation method, and diagnosing prostate cancer from the difference in visualisation. The lube base oil and the lubricating oil composition realize reduction of evaporation loss despite being of low viscosity and excellent compatibility with organic materials.