For regular buildings, the differences between 99.5%, 99.6%, etc. mostly matter to the supplier's Marketing Dept. and Sales Dept. (Vs. whoever's in charge of HVAC for the building it's installed on.)
Though some of the other properties - especially withstanding ~1,000 °C - make it sound pretty useful for military equipment which might be facing weapon-grade lasers or nuclear fireballs.
Though some of the other properties - especially withstanding ~1,000 °C - make it sound pretty useful for military equipment which might be facing weapon-grade lasers or nuclear fireballs.