This seems to be a direct back-translation of the English "fire performance". In German, I'd rather put "Brandverhalten" or "Verhalten unter Brandeinwirkung/im Brandfall" in this context.

See, for example,

https://polymerandfire.files.wordpress.com/2013/04/06-buc.pd... (p. 2)
"Every structure, transportation, storage and processing-related fire presents an opportunity to evaluate, examine and improve fire test methods, the fire performance of materials and fire mitigation and protection strategies. ... Near misses and fire loss investigations are useful when the data is used to: 1) improve the fire performance of materials, ..."

https://www.researchgate.net/publication/229041333_Flammabil...
"Subsequent to the GM study, and in response to the 1997 NTSB recommendations, studies were initiated by the NHTSA [27,[29][30][31][32], GM [33], the MVFRI [21,22,[24][25][26], the National Fire Protection Association's Research Foundation [34] and other organizations [35][36][37] to investigate the fire performance of current automotive materials and to identify or develop test methods to rate fire performance and establish criteria that would significantly improve post-crash vehicle survivability. All these studies reached essentially the same conclusions: ..."

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Note added at 19 mins (2021-06-03 09:39:44 GMT)
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Barbara has apparently hit the nail squarely on its head - please disregard my answer.