Mica tubes are made of layered mica and can either be machined or
unwrapped to fit. Mica tube includes two species:
Muscovite mica tube: Silver color, Heat resistance: 500℃/932°F (In
constant operation), 750 ℃/1382°F (in intermittent operation) .
Phlogopite mica tube: Golden/Amber color, Heat resistance:
750℃/1382°F (In constant operation), 1000 ℃ /1832°F (in
intermittent operation) .