FLOJET JOINTS SEALANT is made from 100% expanded PTFE Fluorocarbon  material, supplied as continues low density cord with self adhesive backing strip. having below :

PROPERTIES :
Flange Load : @30N/mm2 (4400psi)
Pressure : @3000psi.
Density : @0.7 gm/cc.
Temp. Res. : @-240 to + 280 Deg. C.
pH : @0 to 14
Elongation : @120%