bild

Stretched PTFE tape. Coloured scanning electron micrograph of a piece of stretched PTFE tape. PTFE tape (polytetrafluoroethylene) is used as a sealant in pipe joints, such as in plumbing. When a tensile load is applied, the tape stretches and assumes the fibrillar structure seen here. Magnification: x1200 at 6x7cm size. x4220 at 10x8ins (KEYSTONE/SCIENCE PHOTO LIBRARY/SCIENCE PHOTO LIBRARY)