Consider a graphite crucible working under vacuum for melting a metal. The temperature can reach 2000 degree Celsius. It is intended to measure the solved gas content of the metal. So, releasing high amount of volatile material during the process is detrimental for the purpose.
Equipment for measuring gas in metals uses own graphite crucibles.
There are many suppliers manufacture graphite crucibles for melting metals:
http://www.ozgraphite.com/case-51-2.html
http://www.eltra.com/products/consumables/order-data-quote-request/?1481257142
https://asbury.com/materials/graphite-shapes/
https://almath.co.uk/collections/graphite
Thank you Florian. But I have to build my own to optimize its shape for a defined vacuum furnace. So I need to find a certain grade covering the properties and as cheap as possible.
V99A is favorable in your case. You may check its properties, before going for work.
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