False-colour scanning electron micrograph (SEM) of the sticky surface of a 3M "Post-it" sticker,showing the resin spheres containing glue embedded in the paper. The spheres,between 15 & 40 micrometres in diameter,are made from urea formaldehyde resin,which ruptures easily under finger pressure. Each time the notepaper,with its sticky strip,is pressed to a surface a few spheres burst & release a film of glue. The stickers,which are made in a number of sizes by the 3M company,can therefore be reused many times,until finally all the spheres of glue have been used up. Burst spheres appear flattened. Magnification: X 130 at 35mm size. Coloured yellow. Original is BW print H100/080 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 5084 px × 3514 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |