Anti Microbial Range (PURPLE) All products in our Anti Microbial Range contain a silver based anti microbial ionic additive which, is EPA registered and is notified on the European Biocidal Products Directive. It inhibits the growth of moulds, mildews and bacteria on the surface of the products that contain it. Independent laboratory tests (available on request) have shown MRSA and E. Coli cultures in contact with plastic containing the additive were reduced in numbers by 98.9% - 99.99% over a period of 24 hours. The effectiveness of the additive is not affected by other cleaning agents or by autoclaving, and will last the useful life of the product.