Steam Chemical Indicator Class 4 Steam Chemical Indicator Class 4 is the best ways of chemical indicators, The parameters on indicator present us to realize of sterilization process. When we look the indicator, we can understand easily the sterilization process achieve or not. Steam Chemical Indicator Class 4 may be used as internal chemical indicators inside each package, tray, or rigid sterilization container. What do the Chemical Class 4 Indicators mean to the end user ? Steam Chemical Indicator Class 4 measure time, temperature critical parameters of the sterilization process. But Class 4 indicators do not include spores and do not directly control the lethality of the sterilization process. AAMI does not recommend that the Class 4 indicators replace use of biological indicators. Which sterilization process is Chemical Indicator Class 4 designed for ? Chemical Indicators Class 4 are designed to be used in steam sterilizers. Which sterilization cycle is Chemical Indicator Class 4 working with ? Chemical Indicators Class 4 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 Indicator Class 4 ? Chemical Indicators Class 4 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