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...Issn x vulkan verlag essen heat processing international magazine for industrial furnaces treatment plants equipment http www heatprocessing online com muffle temperatures from c with controlled atmospheres and vacuum dipl ing roland waitz linn high therm gmbh germany published in editor stephan schalm tel e mail s de reports technology the hot wall heating furnace operation under aluminium its affinity to oxy gen forms a gastight layer of al o on atmosphere up is briefly described basis ks small medium sized line chamber heater surface which gives further protection against oxidation maxi volumes dm m realizable cooling rates as well influence forced convection multi zone mum temperature wires distribution are discussed comparison between apm residual oxygen content by fore or flushing gas method brief far higher than maximum temper description safety devices explosive gases also ature these part this paper allow safe heaters connected three hermal materials bottom additional can phas...