GE insulating material ??

[Darwin Costello]

I just purchased an all brass 9” GE.  The all brass fan I assume originally came with a bluing on all surfaces of the base fan? At least that’s the way I received. In turning it to an all brass state I disassembled the fan.  When trying to remove the rotor I noticed that there was a formed insulation over the coils on the stator that prevented me from removing it.  It was tied in place through the coils.  It was very brittle and I tried to be careful not to damage it.  I wasn’t that successful.  I would like to replace it but have no idea what kind of material it is or what might work as a replacement material.  PICS ATTACHED:  It has been formed around the coils on the stator.

Does anyone have a suggestion on what I could use that would provide the insulation between the t housing and stator coils.  The back cover conforms to the rounding of the stator coil.  Something I can mold to the shape of the coil/housing.

Any help would be appreciated.