Class 4 Dual Indicator Class 4 Dual Indicator Strips are designed to be used in steam sterilizers. With one accurate calibration world wide it is a secure and safe monitoring system yet simple and easy to use. What do the Chemical Class 4 Dual Indicators mean to the end user ? Chemical Class 4 Dual Indicators enable the end user to understand performance parameters of sterilization process. The appropriate Chemical Class 4 Dual Indicators can be used to obtain the information needed to determine the effectiveness of the sterilization process. Which sterilization process is Chemical Class 4 Dual Indicator designed for ? Class 4 Dual Indicator Strips are designed to be used in steam sterilizers. Dual strip of chemical indicator ink printed on perforated strip present full or half length use for different pack sizes. For rigid sterilization loads there should be at least 2 test strips diagonally opposite in each corner to ensure that the cycle has reached all areas of the machine. Which sterilization cycle is Chemical Class 4 Dual Indicator working with ? Class 4 Dual Indicator Strips are designed operate at steam cycle 134 C – 3,5 minutes or 121 C – 15 minutes conditions. What is the standart of ISO for Chemical Class 4 Dual Indicator ? Class 4 Dual Indicator Strips according to ISO 11140-1 standart. CE marking is not applicable for indicator products, because this product is not considered a medical device under the clause of the EC-directive