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Blue polyethylene microspheres are engineered to be neutrally-buoyant in an aqueous solution with a density (specific gravity) of 1.00g/cc (1.00g/cm3 or 1.00g/ml). Neutrally-buoyant polymer spheres and can be used in flow visualization studies or as a tracer particle for Particle Image Velocimetry (PIV). Highly opaque blue polymer spheres offer maximum hiding power. The blue colorant is embedded into the polymer matrix and will not degrade or leach out into the aqueous solution over time.
Other colors, sizes and grades of polyethylene spherical particles are available:
Polyethylene Microspheres (Colors, Fluorescent, Phosphorescent, Barium Sulfate)
Other neutrally-buoyant particles for flow visualization and PIV are available:
Microspheres for Flow Visualization and PIV (1.0g/cc)
Blue polymer spheres with specific gravity of 1.00g/cc are designed
to match the density of water for optimal suspension of particles,
enabling visualization and characterization of fluid flow for process
modeling, optimization, and testing the capability of devices to
withstand particulate matter in the fluid stream of the aqueous
It is critical that the density of polymer spheres is matched as close as
possible to the density of water at the correct temperature. If there is
a mismatch in density, the microspheres will either sink or float. Please reference our table for Density of Water as a Function of Temperature.
Polyethylene microspheres are hydrophobic and suspend easily in oil-based solutions. They can also be suspended in aqueous solution if coated with a surfactant prior to suspending in water. We recommend using Tween 80 or Tween 20 Surfactants.
Density: 0.99g/cc-1.01g/cc (perfect for suspension in water)
Particles in Size Range: >90%
Spherical Particles: >90%
Microspheres are supplied in dry powder form and are color stable in solution. No solvents are used in the manufacturing process. Polyethylene is inert to most solvents.
FMB - Blue Fluorescent Polymer Microspheres 1.3g/cc - 1-5um
Fluorescent Blue Polyethylene Microspheres 1.13g/cc - 27um to 425um
Blue Fluorescent-Coated Glass Microspheres - Various sizes and densities
Cellulose Acetate Polymer Spheres (Dark Blue and Light Blue) - Large Plastic Beads ~1.3g/cc - 2.0mm and 2.5mm