51.1 MB (51.0 MB compressed)
5095 x 3508 pixels
43.2 x 29.7 cm ⏐ 17.0 x 11.7 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
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 85 at 35mm size. Coloured yellow. Original is BW print H100/079.
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