Gratnells award-winning storage trays are BSI tested fully recyclable and made for heavy educational use.These NEW antimicrobial tray lids are compatible with all our NEW antimicrobial trays they have a BioCote antimicrobial additives are introduced to products during the manufacturing process to provide built-in protection against the effects of microbes.The antimicrobial technology has been empirically proven to eliminate up to 99.99% of both Staphylococcus aureus and Escherichia coli after 24 hours up to 99.95% of these bacteria after 2 hours and up to 80% of these organisms after 15 minutes. The technology is resistant to exposure to commonly used cleaning disinfectants.