RABS / Isolator

Restricted Access Barrier System / Isolator

People are the largest source of contamination in aseptic manufacturing, so modern sterile fill-finish designs put a physical barrier between the operator and the exposed product. The 2022 revision of EU GMP Annex 1 makes barrier technology the expectation for aseptic processing, and the choice between a RABS and an isolator is a core decision in a facility’s Contamination Control Strategy (CCS).

An isolator is a sealed enclosure that is bio-decontaminated (typically with vaporised hydrogen peroxide) to provide the highest assurance of separation. A RABS uses rigid walls and glove ports over a Grade A zone but is less sealed than an isolator; an “open” RABS shares air with the surrounding Grade B cleanroom, while a “closed” RABS remains sealed during operation.

• —Isolator — sealed, actively bio-decontaminated; can sit in a lower-grade background (e.g. Grade C/D).
• —Closed RABS — rigid barrier kept sealed throughout processing; requires a Grade B background.
• —Open RABS — rigid barrier with defined openings; shares air with the Grade B cleanroom.
• —Both rely on first-air protection, glove-port interventions, and no open manual intervention into the Grade A zone.

EU GMP Annex 1 (2022, Manufacture of Sterile Medicinal Products); FDA Guidance for Industry — Sterile Drug Products Produced by Aseptic Processing (2004).