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Cospheric LLC specializes in a large selection of polyethylene microspheres in particle size from 1um to 1.7mm. High quality solid polyethylene microspheres are now commercially available not only in a wide variety of colors, but also with opaque, paramagnetic, fluorescent, and phosphorescent properties. Some polyethylene microspheres have a strong triboelectric (electrostatic) charge. Black microspheres can be manufactured with paramagnetic or static-dissipative properties.

Microspheres in any color can be made neutrally buoyant in water with specific gravity of 1.00g/cc. The density can be adjusted to create microspheres neutrally buoyant in other media. A wide variety of PE microparticles with custom specific gravity from 0.96g/cc to 1.3g/cc, allowing researchers to match the density of the spheres to that of the surrounding fluid for PIV and fluid flow visualization experiments, as well as density marker beads applications. Most of the grades of polyethylene microspheres meet the specification of >90% in particle size range and >90% spherical particles. PE Polymer beads are generally hydrophobic and have high protein binding abilities. However, they often require the use of a surfactant to ensure ease of handling and suspension in aqueous solutions. Custom color and density polyethylene microspheres can be manufactured by request.

Size and Form: Solid polymer spheres in dry powder form. Refer to sizes for USA standard sieves (ASTM E11) for ranges of particle sizes. Sphericity: Polyethylene spheres are screened to prevent any dust, debris, and non-spherical microparticles. High quality identical polymer spheres with excellent uniformity. Opacity: Clear microspheres are translucent pure polyethylene. Opaque microspheres are truly opaque (will not transmit light even in a 50um monolayer).

See link for research articles involving our polyethylene spheres.


Products 1-44 of 44
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Highly Opaque White Polyethylene Microspheres, Polymer Beads, Particles
Item #: WPMS -
Price: $103.95-$372.75
Item #: WPMS - View

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... [more info...]

Black Paramagnetic Polyethylene Microspheres 10um to 1mm in Diameter. Paramagnetic microspheres have the ability to increase their magnetization with an applied magnetic field and decrease their magnetism when the field is removed.
Item #: BKPMS -
Price: $103.95-$215.00
Item #: BKPMS - View

Paramagnetic microspheres have the ability to increase their magnetization with an applied magnetic field and decrease their magnetism when the field is removed. No residual magnetization is... [more info...]

Janus Particles - Black Paramagnetic Microsphere Core with Partial White Coating (Bipolar and Bichromal Particles)
Item #: HCMS-Polymer -
Price: $295.00-$495.00
Item #: HCMS-Polymer - View

Janus particles are microspheres with dual-functionality. We specialize in creating hemispherical coatings on microspheres of any material with diameters greater than 45micron. Custom colors, cores,... [more info...]

UVPMS-BG Fluorescent Spectra (Excitation & Emission curves)
Item #: UVPMS-BG-1.025 -
Price: $103.95-$298.50
Item #: UVPMS-BG-1.025 - View
Fluorescent Green Polyethylene Microspheres<br>Bright Green Polymer Beads Density 1.015g/cc
Item #: UVPMS-BG-1.015 -
Price: $103.95
Item #: UVPMS-BG-1.015 - View

Density: 1.01-1.02g/cc Daylight Color: Fluorescent Green (515nm Peak) Fluorescent Response: Peak emission of 515nm when excited at 414nm Particles in Size Range: > 90% Spherical Particles: >... [more info...]

Fluorescent Green Polyethylene Microspheres<br>Bright Green Polymer Beads Density 1.01g/cc
Item #: UVPMS-BG-1.01 -
Price: $103.95-$215.00
Item #: UVPMS-BG-1.01 - View

Density: 1.00-1.02g/cc Daylight Color: Fluorescent Green (515nm Peak) Fluorescent Response: Peak emission of 515nm when excited at 414nm Particles in Size Range: > 90% Spherical Particles: >... [more info...]

Fluorescent Green Polyethylene Microspheres<br>Bright Green Polymer Beads Density 1.02g/cc
Item #: UVPMS-BG-1.02 -
Price: $103.95
Item #: UVPMS-BG-1.02 - View

Density: 1.015-1.025g/cc Daylight Color: Fluorescent Green (505nm Peak) Fluorescent Response: Peak emission of 515nm when excited at 414nm Particles in Size Range: > 90% Spherical Particles: >... [more info...]

Fluorescent Green Polyethylene Microspheres Density 1.035g/cc<br>Bright Green Polymer Spherical Microbeads
Item #: UVPMS-BG-1.035 -
Price: $103.95-$215.00
Item #: UVPMS-BG-1.035 - View

Density: 1.03-1.04g/cc Daylight Color: Fluorescent Green (515nm Peak) Fluorescent Response: Peak emission of 515nm when excited at 414nm Particles in Size Range: >90% Spherical Particles: >90%... [more info...]

Fluorescent Red Polyethylene Microspheres Density 0.99g/cc Bright Fluorescent Red Particles 605nm Peak
Item #: UVPMS-BR-0.995 -
Price: $103.95-$298.50
Item #: UVPMS-BR-0.995 - View

Density: 0.985g/cc - 1.005g/cc (Designed for Water Suspension)Daylight Color: Fluorescent Red (607nm Peak) Fluorescent Response: Fluorescent Red under 300-550nm wavelengths. Works well with Green... [more info...]

Fluorescent Red Polyethylene Microspheres Density 1.20g/cc Bright Fluorescent Red Particles 605nm Peak
Item #: UVPMS-BR-1.20 -
Price: $103.95-$215.00
Item #: UVPMS-BR-1.20 - View
Fluorescent Yellow Microspheres Density 1.02g/cc for Flow Visualization and PIV<br>Bright Fluorescent Yellow-Green Particles with UV and Visible Illumination
Item #: UVPMS-BY2-1.02 -
Price: $215.00
Item #: UVPMS-BY2-1.02 - View
Fluorescent Polymer Spheres (Green) 1.100g/cc density
Item #: UVPMS-BG-1.100 -
Price: $215.00-$447.75
Item #: UVPMS-BG-1.100 - View
Fluorescent Orange Polyethylene Microspheres Density 1.00g/cc<br>Spherical Bright Orange MicroBead Polymer Particles for Flow Visualization and PIV
Item #: UVPMS-BO-1.00 -
Price: $103.95-$215.00
Item #: UVPMS-BO-1.00 - View
Fluorescent Orange Polyethylene Microspheres Density 1.015g/cc<br>Bright Orange Polymer Spherical MicroBeads
Item #: UVPMS-BO-1.015 -
Price: $103.95-$215.00
Item #: UVPMS-BO-1.015 - View
Fluorescent Orange Polyethylene Microspheres Density 1.030g/cc<br>Spherical Polymer Particles Fluorescent in UV Light
Item #: UVPMS-BO-1.03 -
Price: $103.95-$215.00
Item #: UVPMS-BO-1.03 - View
Blue Polyethylene Microspheres Density of 1.00g/cc <br>Spherical Particles for Flow Visualization and PIV
Item #: BLPMS-1.00 -
Price: $103.95-$372.75
Item #: BLPMS-1.00 - View

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... [more info...]

Bright Blue Polymer Spherical MicroBeads. Spherical particles with density of 1.08g/ml are designed to match the density of white blood cells and enable analyzing, studying, and modeling the behavior of blood.
Item #: BLPMS-1.08 -
Price: $103.95-$372.75
Item #: BLPMS-1.08 - View
Red Polyethylene Microspheres Denstiy 1.080g/cc<br>Bright Red Polymer Spherical Microbeads
Item #: REDPMS-1.080 -
Price: $103.95
Item #: REDPMS-1.080 - View
Red Polyethylene Microspheres Density 1.065g/cc<br>Bright Red Polymer Spherical Microparticles
Item #: REDPMS-1.055-1.065 -
Price: $103.95
Item #: REDPMS-1.055-1.065 - View
Red Polyethylene Microspheres Density 1.09g/cc<br>Bright Red Polymer Spherical Microbeads
Item #: REDPMS-1.09-1.10 -
Price: $103.95
Item #: REDPMS-1.09-1.10 - View
Fluorescent Violet Polyethylene Microspheres<br>Density 1.00g/cc for Flow Visualization and PIV
Item #: UVPMS-BV-1.00 -
Price: $157.00-$372.75
Item #: UVPMS-BV-1.00 - View
Fluorescent Violet Polyethylene Microspheres<br>Density 1.06g/cc
Item #: UVPMS-BV-1.06 -
Price: $103.95-$131.25
Item #: UVPMS-BV-1.06 - View
Barium Sulfate White Polyethylene Polymer Microspheres - Particles for MRI or X-Ray Medical Applications - Density of 1.5g/cc
Item #: BSPMS -
Price: $157.00-$261.00
Item #: BSPMS - View

White barium sulfate polyethylene microspheres are supplied in dry powder form and are stable in solution. Polyethylene microspheres are hydrophobic and suspend easily in oil-based solutions.... [more info...]