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Each bead is made of thin-walled, air-filled bubbles of polystyrene. Expanded polystyrene (EPS) is a rigid and tough, closed-cell foam with a normal density range of 11 to 32 kg/m 3 . [ 47 ] It is usually white and made of pre-expanded polystyrene beads.
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.
Ion-exchange resin beads. An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange, that is also known as an ionex. [1] It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate.
Microbeads were created when John Ugelstad managed to form polystyrene beads of the same spherical sizes at the Norwegian University of Science and Technology (NTNU) [5] in 1977. [4] A few years later, he created superparamagnetic microbeads ( Dynabeads ), which exhibit magnetic properties when placed in a magnetic field.
This cute bracelet has an adjustable sliding bead and colorful heart charms across the gold chain. Plus, the 14K yellow gold coating over the brass will keep it from tarnishing easily. $60 at ...
Pre-expanded beads of polystyrene are injected into a preheated aluminum mold at low pressure. Steam is then applied to the polystyrene which causes it to expand more to fill the die. The final pattern is approximately 97.5% air and 2.5% polystyrene. Pre-made pouring basins, runners, and risers can be hot glued to the pattern to finish it. [1]
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