Process indicator (Class 1)

Also called: Class 1 chemical indicator

Process indicator (Class 1) — A Class 1 chemical indicator — usually indicator tape or printed ink on a pouch — that separates processed from unprocessed items.

Class 1 indicators sit on the outside of each pack. Their colour change tells staff at a glance that the pack has been through a sterilization process, so an unprocessed pack is not issued by mistake.

They react quickly and are not designed to show that conditions inside the pack were adequate. That is the job of a Class 4, 5 or 6 indicator placed inside the pack.

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