Trends in negative pressures and cavitation events were investigated for a Berthelot system comprising a water/stainless steel tube (SUS 316)/sealing Ni plug. When the system was repeatedly heated and then cooled over an appropriate temperature range (temperature cycle), negative pressure was usually found to increase with the cycle. A de-gassing pre-treatment for the sealing metal above 350 degrees C provided a retardation in the increasing trend; and, despite this, an eventual higher negative pressure than that attained for a metal which was non-de-gassed. Underwater pre-pressurization for the plug at a few kbar exhausted weak gaseous nuclei efficiently. Heterogeneous nuclei which still crept into the system were exhausted by temperature cycles after closing the system. The pre- and post-treatment conditioning led to a rise in negative pressure to -170 bar for about 1 g of water (the highest value ever recorded in a metal tube) at 59 degrees C after a total of 1500 temperature cycles. The result shows the potential of a metal Berthelot tube with which high static negative pressure can be achieved in useful volumes of liquids.

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