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Hi Elodie
I presume you're looking at the de Montfort incinerator
https://www.mw-incinerator.info/en/101_welcome.html
This is a known problem - MSF have been experimenting with other designs that are made from metal but it is still being trialled. It's not just about the materials, but standards of workmanship and operation.
There is about to be a call for innovation in this area as part of the Humanitarian Innovation fund - not very helpful for you but shows you're not alone!