No, it was energy beams that was twisted and condensed into a thread by spinning Gravitanium Magnets. It was used to stabilize portals. The problem with Gravitanium is that it can't pass through unstable portals, because Gravitanium will open up small black holes, even though they usually disappear within very minute amounts of time. With enough volume, energy and velocity involved, it can create a permanent and very dangerous black hole. Invincium stabilizes the system, and practically makes portals seen from the game, Portal possible. The difference is that it can be applied to any surface, and the portal can be any size, depending on the amount of energy put into it.