what is HTC useing to glue the screen & the digitizer?

[Mike S]

So am trying to fix my nexus one the digitizer broke so i got it apart but i wana put it back together and i dont want any glue or crazy double side tape i wana use the thing that they use it was hard to get the screen out but doable if i use glue i wont b able to fix it again if god forbid it happened again so they were useing it loked like adhesive black foam plez help meeeeeeeeeeeeeeeeeeeee