Thanks Robert for the additional information.

Since posting I have found the following:

"Since the Walter plant was based on the use of hydrogen peroxide as an
oxygen carrier, some remarks on this substance are given here. The peroxide
used for submarine propulsion was 80% (approx.) solution of hydrogen
peroxide (H2O2) in water. The Germans called it T-Stoff, Ingolin or Aurol".

So, all these names are just a Trade-Name for a Hydrogen Peroxide mixture.

Problem solved.

Phil