Donation Identification Number (DIN) Labels sets are used to accurately label and identify blood samples at the time of donation. Simply looking at a DIN label you would not think it to be very complex. However, DIN labels must be extremely durable in order to meet demanding application requirements of hospitals and blood centers. Not only must these labels withstand temperature changes that come with cryogenic freezer storage and heated incubation, but they also must be chemical resistant. The adhesive we use adheres the label securely to the filled bag and stays put in all of these environments.