Sure-Check® Sterilization Pouches Triple Your Confidence with Sure-Check® Sterilization Pouches Meeting ISO 11140-1 requirements, Class 4 internal/external multi-variable chemical indicators, only change color when all 3 criteria for sterilization have been met; time, temperature, and steam Sure-Check features: Secure Seal - Heavier seal at chevron for added protection against instrument breaching. Medical Grade Paper - Wet strength treated, virgin medical grade paper that meets medical pouch standards. Transparent Film - Allows a clear view of the contents as well as the internal indicators. Wide Self-Seal Adhesive Strip - Wider sealing area of strip securely seals pouch and provides sterilization integrity of contents during storage. Contents will remain sterile for an indefinite period of time provided the integrity of the pouch is not compromised. Perforated Fold - Allows for accurate folding of adhesive strip to form an airtight seal, maintaining the integrity of the pouch during storage after sterilization. Complete Film/Paper Separation - The high quality of materials and manufacturing process assures a consistently clean separation (peeling) of the film from the paper, maintaining the sterile integrity of the contents. Thumb Notch - Assures easy opening of pouch. Corner Tack Seals - Three tack seals on each corner prevent curling and possible separation after sterilization. In addition it prevents the collection of dust and other contaminants in the sealed area.