- Made up of polythene sheets with a special adhesive on the upper surface of each, which removes particles stuck to the shoes of staff or the wheels of vehicles entering a particular area.
- After removing the protective layer from the underside to reveal the adhesive layer, this is then carefully applied to the surface where it is to be attached. Once well stuck down, the upper layer is removed to reveal the first sheet.
- A small box in one of the corners indicates the number of sheets remaining, and is used to start to peel off each contaminated layer.
- Each box contains 8 carpets of 30 sheets each, numbered from 30 to 1.
- These carpets (also known as de-contaminating thresholds) are placed in the entrance to operating rooms and clean and sterilerooms.