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Class 4 indicators are manufactured in the form of self-adhesive paper discs with an indicator mark occupying 25% of the area of the disc and strips.
Class 4 indicators are designed:
•121°C – 20 min., 126°C – 10 min, 134°C – 5 min.
•121°C – 20 min., 126°C – 10 min, 134°C – 7 min.
•120°C – 45 min., 132°C – 20 min.
