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Two principal techniques are used to produce seed beads: the wound method and the drawn method. The wound method is the more-traditional technique, is more time-consuming, and is no longer used in modern bead production: in this technique, a chunk of glass known in glassmaking as a gather and composed mainly of silica is heated on an iron bar until molten.
Dynabeads were developed after John Ugelstad managed to create uniform polystyrene spherical beads (defined as microbeads) of exactly the same size, [1] [2] at the University of Trondheim, Norway in 1976, something otherwise only achieved by NASA [3] in the weightless conditions of SkyLab. Dynabeads are typically 1 to 5 micrometers in diameter.
A microbead imaged using scanning electron microscopy. Microbeads are manufactured solid plastic particles of less than one millimeter in their largest dimension [4] when they are first created, and are typically created using material such as polyethylene (PE), polyethylene terephthalate (PET), nylon (PA), polypropylene (PP), and polymethyl methacrylate (PMMA). [5]
Spacer, a viscous fluid used to remove drilling fluids ahead of cement slurry. The spacer is made up with specific fluid attributes, such as viscosity and density that are designed to prohibit the interaction between the mud and cement slurry.
Roman bead and reel on a fragment of the entablature from the courtyard colonnades of the Sanctuary of Jupiter Heliopolitanus, Baalbek, Lebanon, 2nd century AD, limestone, Pergamon Museum, Berlin. Bead and reel is an architectural motif, usually found in sculptures, moldings and numismatics. It consists in a thin line where beadlike elements ...
The bead or ball itself may additionally be made from coloured glass, acrylic or ceramic, or a gemstone. This is a popular piece of body jewelry because it conveniently allows the wearer to remove the ring by simply removing the captive bead; the bead is held firmly in place so that it will not easily fall out. Additionally, because of their ...
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