Filtrek

Filtrek is either a brand or a type of Cybertronian forceshields.

Fiction

Dreamwave Armada comics

The Mini-Cons of Village C52 used a Filtrek-A forceshield to protect themselves against the upcoming Decepticon attack. It didn't work, Armada #1 and when the Autobots came to investigate the village's ruins, Red Alert tactfully noted it was no surprise the Mini-Cons had been captured with such ancient technology; They should have used the new Filtrek-H model, which had twice the energon density and three times the radius. Armada #2

TransTech

An Axiom Nexus outpost in orbit around Skriixos V made use of a Filtrek-K cloaking shield, though it was damaged during a battle between the Skriix and Recyclons. Andromeda - Axiom Nexus News Reporter