Multi-variable indicator (Class 4)

Also called: Class 4 chemical indicator

Multi-variable indicator (Class 4) — A Class 4 chemical indicator that reacts to two or more critical variables of a sterilization cycle, such as time and temperature.

Class 4 strips are placed inside packs to show that the conditions at that point reached the indicator’s stated values. They are widely used for steam, hydrogen-peroxide plasma and ethylene-oxide loads.

Because they respond to more than one variable, they are more informative than a Class 1 tape, but they are less tightly matched to a specific cycle than Class 5 or Class 6 indicators.

Questions about Multi-variable indicator (Class 4)?The ProDr desk answers technical and documentation questions within one business day.

WhatsApp the desk All terms