In principle, Multiply PCR tubes and Multiply PCR plates can be frozen as they are made of polypropylene. However, the freezing conditions must be selected such that the content can be evenly frozen or frozen from the bottom to the top. Cracks caused by strain can occur in the lower part if the upper part of the tube freezes first as a result of unfavourable freezing conditions. For example, depending on the diameter of the hole, stands made out of Styrofoam have a strongly insulating effect which makes it more difficult to ensure the even freezing of the samples. Due to the large number of possible influence factors (the load on the tubes can be very different depending on the medium to be frozen and the routine conditions), we recommend you carry out a freezing test under your routine conditions.