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Polypropylene Spheres are highly spherical plastic particles. Large, highly-spherical particles of density less than 1g/cc are a useful tool as reference particles in simulation experiments and process troubleshooting. Polypropylene spheres are supplied as dry spheres.
Other colors, sizes and grades of spherical particles are available:
Spherical Microparticles (Colors, Fluorescent, Phosphorescent, Barium Sulfate)
Particles Diameter Tolerance: +/-0.05mm
Spherical Particles: >95%
Material Safety Data Sheet - Polypropylene Spheres
Peer-reviewed articles using polypropylene spheres:
X-ray Phase Contrast Imaging of Preclinical Atherosclerosis
Phosphorescent Polymer Spheres - 1.04g/cc 5.9mm
Black Cellulose Acetate Polymer Spheres - Large Plastic Beads ~1.3g/cc - 1.5mm to 3.5mm
White Polymer Spheres - 1.8g/cc - 5.9mm
Cellulose Acetate Polymer Spheres - Large Plastic Beads ~1.3g/cc - 1mm to 12mm - All Colors