SpaceX wants 10 flights with a bare minimum of refurbishment and 100 or more launches with intermittent maintenance.

Chris G – NSF, Assistant managing editor, journalist, and writer for @NASASpaceflight tweeted out a photo of the first Block 5 Falcon 9.

Teslarati reports:

In the past, SpaceX has used high-quality cork as a quasi-ablative thermal protection system for those same components, including the payload fairing. A major downside of cork, however, is that it is very ablative and tends to come off rather haphazardly in large chunks, all of which must either be spot-fixed or replaced entirely before a booster reflight. By replacing that cork with Pyron or a similar internally-developed material, those sensitive Falcon components may be almost totally insulated from and resistant to temperatures as high as 2300 °F (1200 °C)