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By Density

When selecting microspheres for a project, density (or specific gravity) is often one of the most critical specifications. Density of microspheres becomes particularly important for applications that require microspheres to be suspended in a fluid. When long-term suspension of microspheres in an aqueous solution is required, it is critical that the density of microspheres is matched as close as possible to the density of water at the correct temperature. Settling time and velocity are proportional to density delta (also known as density mismatch), which means that matching the density of the particle to the density of the liquid is very important for minimizing settling velocity and maximizing the time microspheres spend in suspension. Keep in mind that even the slightest variation in density matters, and densities of liquids sometimes vary significantly with changes in temperature, pressure, and materials added to it.

In addition to the huge selection of spherical powders with densities ranging from 0.05g/cc to 9g/cc, Cospheric is the only company that offers custom density polyethylene microspheres in ranges from 0.96g/cc and 1.2g/cc. Cospheric is also the only company that offers Density Marker Beads, often used for creating density gradients in biotechnology applications and as density calibration or reference particles in other industries. Our spherical particles are characterized with NIST-traceable Density Measurements utilizing the most accurate gas pycnometer on the market.


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Products 1-50 of 116
Precision Polished Soda Lime Glass Spheres 1.5mm
Product ID: P-GS
Precision Polished Grades of Solid Glass Spheres.
>99% spherical; ≤20um Roundness
0.70mm to 7.00mm ±20um Diameter
Borosilicate (2.2g/cc) & Soda Lime Glass (2.5g/cc)
[more info...]
Price: $45.00-$142.00


Solid Soda Lime Glass Microspheres 2.5g/cc<br>Particle Sizes between 1micron and 7.1mm
Product ID: SLGMS-2.5
Classified Grades of Soda Lime Solid Glass Microspheres.
>85% spherical >90% in size range. Many particle sizes between 1um and 7.1mm.
[more info...]
Price: $55.00-$248.50


Solid Soda Lime Glass Spheres 2.5g/cc<br>Particle Sizes between 850um and 7.1mm
Product ID: SLGS-2.5
Classified Grades of Soda Lime Solid Glass Spheres.
>85% spherical >90% in size range. Many particle sizes between 850um and 7.1mm
[more info...]
Price: $55.00-$165.00


Spacer Spheres - Monodisperse Solid Soda Lime Microspheres - Calibration Grade
Product ID: S-SLGMS-2.5
Bondline Spacer / Calibration/Monodisperse Grades of Soda Lime Solid Glass Microspheres.
>90% spherical and 95% in size range. Tight particle size ranges between 18micron and 219micron in diameter.
[more info...]
Price: $125.00-$248.50


Bulk Grades of Solid Soda Lime Glass Microspheres 2.52g/cc. Optional Fluorochemical and Silane Coatings.<br>Mean Diameters 3.5-5.5um, 8.5-12um, 34-42um, 65-75um.
Product ID: P2000SL-2.5
Bulk Grades of Solid Soda Lime Glass Microspheres 2.5g/cc. Optional Fluorochemical and Silane Coatings.
Mean Diameters 3.5-5.5um, 8.5-12um, 34-42um, 65-75um.
[more info...]
Price: $50.00-$168.00


High Index of Refraction Glass Spheres 75-80um
Product ID: BTGMS-HI
Classified Grades of High Index of Refraction Barium Titanate Solid Glass Microspheres
Density: 4.1-4.2g/cc
Sizes: 60um to 600um
Index of Refraction: >1.93
[more info...]
Price: $125.00-$184.50


Barium Titanate Solid Glass Microspheres and Spheres
Product ID: BTGMS-4.49
Classified Grades of Barium Titanate Solid Glass Microspheres
Density: 4.0-4.5g/cc
Sizes: 5um to 1000um (1mm)
Index of Refraction: ~1.9
[more info...]
Price: $99.00-$248.50


Barium Titanate Solid Glass Microspheres and Spheres
Product ID: BTGMS-ND2.2
Classified Grades of Barium Titanate Solid Glass Microspheres
Density: 4.35-4.38g/cc
Sizes: 5um to 85um
Index of Refraction: ~2.2
[more info...]
Price: $99.00-$248.50


Gold-Coated Solid Glass Microspheres - High Density - Transparent Slightly Conductive Gold Coating on Glass Particles
Product ID: BTGMS-AU-4.49
Gold-Coated (~20nm coating thickness)
Solid Barium Titanate Glass Microspheres 4.49g/cc
Size range: 30-100um
[more info...]
Price: $279.50


Barium Titanate Solid Glass Microspheres 30-100 micron and 0.3-1mm Diameter
Product ID: BTGMS-4.49-B
Bulk Grades of Barium Titanate Solid Glass Microspheres
Density: 4.0-4.5g/cc
Sizes: 30-100um and 0.3-1.0mm in Diameter.
Index of Refraction: 1.9
[more info...]
Price: $50.00-$158.00


High Index of Refraction Glass Spheres 325-600um
Product ID: BTGMS-HI-B
Classified Grades of High Index of Refraction Barium Titanate Solid Glass Microspheres
Density: 4.1-4.2g/cc
Sizes: 60-75um, 70-90um, 125-190um, 180-265um, 325-600um
Index of Refraction: >1.93
[more info...]
Price: $62.50-$1,038.00


Retroreflective Half-Shell Aluminum Coated Solid Glass Microspheres
Product ID: P2453BTA-4.2 30-100um
Retroreflective Half-shell Aluminum Coating on Solid Barium Titanate Glass Microspheres
Density 4.2g/cc. Particle Size 30-100um. Uncoated, Silane and Fluorochemical Coatings
[more info...]
Price: $99.00-$550.00


Blue Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter
Product ID: FMB-1.3 1-5um
Blue Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Excitation and Emission Wavelength Spectra. Peak at 445nm.
[more info...]
Price: $99.00


Green Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Product ID: FMG-1.3 1-5um
Green Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter
Excitation and Emission Wavelength Spectra. Peak at 515nm.
[more info...]
Price: $99.00


Yellow Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter
Product ID: FMY-1.3 1-5um
Yellow Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Excitation and Emission Wavelength Spectra. Peak at 525nm.
[more info...]
Price: $99.00


Orange-Yellow Fluorescent Microspheres 1-5micron (um) - Emission Wavelength Spectra 594nm Peak, Excitation Wavelength Specta 460nm Peak
Product ID: FMOY-1.3 1-5um
Orange-Yellow Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter
Emission Wavelength Spectra 594nm Peak, Excitation Wavelength Specta 460nm Peak
[more info...]
Price: $99.00


Orange Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Product ID: FMO-1.3 1-5um
Orange Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Excitation and Emission Wavelength Spectra. Peak at 606nm.
[more info...]
Price: $99.00


Red Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron
Product ID: FMR-1.3 1-5um
Red Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Excitation and Emission Wavelength Spectra. Peak at 607nm.
[more info...]
Price: $99.00


Violet Fluorescent Microspheres 1-5micron (um) - Emission Wavelength Spectra 636nm Peak, Excitation Wavelength Specta 584nm Peak
Product ID: FMV-1.3 1-5um
Violet Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter
Emission Wavelength Spectra 636nm Peak, Excitation Wavelength Specta 584nm Peak
[more info...]
Price: $99.00


Barium Sulfate White Polyethylene Polymer Microspheres<br>MRI or X-Ray Medical Applications - Density of 1.00g/cc
Product ID: BSPMS-1.00
Barium Sulfate White Polyethylene Polymer Microspheres
MRI or X-Ray Medical Applications - Density of 1.00g/cc
[more info...]
Price: $148.50-$248.50


Barium Sulfate White Polyethylene Polymer Microspheres - Particles for MRI or X-Ray Medical Applications - Density of 1.5g/cc
Product ID: BSPMS-1.5
Barium Sulfate White Polyethylene Polymer Microspheres - Density of 1.5g/cc
Polymer Particles for MRI or X-Ray Medical Applications
[more info...]
Price: $148.50-$248.50


Black Cellulose Acetate Polymer Spheres Density -1.3g/cc 2.5mm and 3.00mm<br>Other Sizes and Colors Available by Request
Product ID: CAS-BK-1.3
Black Cellulose Acetate Polymer Spheres Density ~1.3g/cc - Particle Diameter 1.5mm to 3.5mm
Other Sizes and Colors Available by Request
[more info...]
Price: $50.00


Blue Cellulose Acetate Polymer Spheres Density -1.3g/cc 2.0mm Other Sizes and Colors Available by Request
Product ID: CAS-BL-1.3
Blue Cellulose Acetate Polymer Spheres Density ~1.3g/cc - Particle Diameter 2.0mm & 2.5mm
Other Sizes and Colors Available by Request
[more info...]
Price: $50.00


Borosilicate Solid Glass Microspheres 2.2g/cc<br>Many Sizes 20micron to 6150mm
Product ID: BSGMS-2.2
Classified Grades of Borosilicate Solid Glass Microspheres 2.2g/cc
>90% spherical and >90% in size range. Particle Sizes Between 20micron and 6150micron.
[more info...]
Price: $125.00-$299.00


Borosilicate Solid Glass Spheres 2.2g/cc<br>Many Sizes 850micron to 6.15mm
Product ID: BSGS-2.2
Classified Grades of Borosilicate Solid Glass Microspheres 2.2g/cc
>90% spherical and >90% in size range. Particle Sizes Between 850micron to 6.15mm
[more info...]
Price: $125.00-$175.00


Fluorescent yellow spheres. Neutrally-buoyant microspheres for flow visualization.
Product ID: UVPMS-BY-1.00
Bright Yellow Polyethylene Microspheres 1.00g/cc - Various Sizes Between 500micron and 0.85mm
Neutrally-buoyant spheres for flow visualization.
[more info...]
Price: FREE


Red Cellulose Acetate Polymer Spheres Density -1.3g/cc - 1.5mm and 3.00mm<br>Other Sizes and Colors Available by Request
Product ID: CAS-1.3
Cellulose Acetate Polymer Spheres Density 1.3g/cc - Particle Diameters 1.0mm to 8.0mm
Other Sizes and Colors Available by Request
[more info...]
Price: $50.00


Large PMMA Spheres
Product ID: PMMAMS-1.2
Clear Poly(Methyl Methacrylate) PMMA microspheres supplied in dry powder form
>90% in particle size range. Particle sizes between 150 and 750micron.
[more info...]
Price: $197.50


Clear Poly(Methyl Methacrylate) PMMA Microspheres
Product ID: PMPMS-1.2
Clear Poly(Methyl Methacrylate) PMMA microspheres supplied in dry powder form
>90% in particle size range. Particle sizes between 3 and 150micron.
[more info...]
Price: $112.50-$279.50


Clear Polyethylene Microspheres 0.96g/cc - Various Sizes 100micron to 1180micron (1.2mm)
Product ID: CPMS-0.96
Clear Polyethylene Microspheres 0.96g/cc - Various Sizes 1micron to 1180micron (1.2mm)
>90% in particle size range and >90% spherical.
[more info...]
Price: $99.00-$248.50


Clear Polyethylene Particles 0.96g/cc - Various Sizes 0.6mm - 2.8mm
Product ID: CPB-0.96
Clear Polyethylene Particles 0.96g/cc - Various Sizes 0.6mm - 2.8mm
Polymer Beads >90% in Particle Size Range >75% Round
[more info...]
Price: $55.00


Highly Electrically Conductive Hollow Glass Microspheres
Product ID: M-18-Ni-0.69
Electrically conductive nickel-coated microspheres with density of 0.69g/cc.
Particle Size Range 5-30um.
[more info...]
Price: $85.00


Conductive Silver Metal Coated Hollow Glass Microspheres - 10-150micron
Product ID: M-60-0.16
Conductive Silver Metal Coated Hollow Glass Microspheres 0.15-0.42g/cc
Various Sizes 10-150micron.
[more info...]
Price: $99.00-$279.50


Conductive Silver Metal Coated Hollow Glass Microspheres - Density 0.49g/cc
Product ID: M-40-0.49
Conductive Silver Metal Coated Hollow Glass Microspheres 0.41-0.72g/cc
Various Sizes 10-90micron
[more info...]
Price: $99.00-$249.00


Highly Electrically Conductive Hollow Glass Microspheres
Product ID: M-18-AG-0.75
Highly electrically conductive silver-coated microspheres with density of 0.75g/cc
Particle Size Range 5-30um. 45dB of EMI shielding at 20% loading.
[more info...]
Price: $99.00-$1,481.00


"Conductospheres™" Conductive Silver Metal Coated Hollow Glass Microspheres
Product ID: HGMS-AG-1.08
Highly electrically conductive microspheres can be used as a filler that is lighter than solid silver.
Add to paints, adhesives and composites to provide electrical conductivity.
[more info...]
Price: $198.50-$248.50


Soda Lime Solid Glass Silver Metal Coated Microspheres<br>Density 2.5g/cc
Product ID: SLGMS-AG-B
Conductive Silver Metal Coated Solid Soda Lime Glass Microspheres - Bulk Sizes between 11 and 110micron.
>80% in particle size range and >85% spherical particles.
[more info...]
Price: $99.00-$148.50


Silver Metal Coated Soda Lime Solid Glass Microspheres<br>Density 2.5g/cc
Product ID: SLGMS-AG
Conductive Silver Metal Coated Solid Soda Lime Glass Microspheres - Sizes between 1 and 106micron.
>90% in particle size range and >85% spherical particles.
[more info...]
Price: $99.00-$174.50


Fluorescent Green Polyethylene Microspheres<br>Density 1.00g/cc for Flow Visualization and PIV
Product ID: UVPMS-BG-1.00
Fluorescent Green Polyethylene Microspheres Density of 1.00g/cc
Spherical Flourescent Particles for Flow Visualization and PIV
[more info...]
Price: $99.00-$248.50


Fluorescent Orange Polyethylene Microspheres Density 1.00g/cc<br>Spherical Bright Orange MicroBead Polymer Particles for Flow Visualization and PIV
Product ID: UVPMS-BO-1.00
Fluorescent Orange Polyethylene Microspheres Density 1.00g/cc
Spherical Bright Orange MicroBead Polymer Particles for Flow Visualization and PIV
[more info...]
Price: $99.00-$248.50


Fluorescent Red Polyethylene Microspheres<br>Density 0.995g/cc<br>Bright Fluorescent Red Particles 605nm Peak.
Product ID: UVPMS-BR-0.995
Fluorescent Red Polyethylene Microspheres Density 0.995g/cc
Bright Fluorescent Red Particles 605nm Peak. Works well with Green Lasers.
[more info...]
Price: $99.00-$248.50


Fluorescent Red Polyethylene Microspheres Density 1.20g/cc Bright Fluorescent Red Particles 605nm Peak
Product ID: UVPMS-BR-1.20
Fluorescent Red Polyethylene Microspheres 1.20g/cc - Various Sizes 10um to 600um (0.6mm) [more info...]
Price: $99.00-$248.50


Fluorescent Violet Polyethylene Microspheres<br>Density 1.00g/cc for Flow Visualization and PIV
Product ID: UVPMS-BV-1.00
Fluorescent Violet (Purple) Polyethylene Microspheres Density of 1.00g/cc
Spherical Flourescent Particles for Flow Visualization and PIV
[more info...]
Price: $148.50-$248.50


Fluorescent Yellow Microspheres Density 1.00g/cc for Flow Visualization and PIV<br>Bright Fluorescent Yellow-Green Particles with UV and Visible Illumination
Product ID: UVPMS-BY2-1.00
Fluorescent Yellow Microspheres Density 1.00g/cc for Flow Visualization and PIV
Bright Fluorescent Yellow-Green Particles with UV and Visible Illumination
[more info...]
Price: $99.00-$248.50


Green Cellulose Acetate Polymer Spheres Density -1.3g/cc - Particle Diameters 1.8mm and 2.9mm
Product ID: CAS-GRN-1.3
Green Cellulose Acetate Polymer Spheres Density ~1.3g/cc - Particle Diameters 1.9mm-2.8mm
Other Sizes and Colors Available by Request
[more info...]
Price: $50.00


Green Polyethylene Microspheres Density 0.98g/cc<br>Translucent Green Spherical Polymer Microbeads
Product ID: GPMS-0.98
Green Polyethylene Microspheres Density 0.98g/cc
Translucent Green Spherical Polymer Microbeads
[more info...]
Price: $99.00-$248.50


Grey Polyethylene Microspheres Density 1.02g/cc<br>Spherical Opaque Grey Particles for Flow Visualization and PIV
Product ID: GRYPMS
Grey Polyethylene Microspheres
Density 1.00g/cc, 1.02g/cc, 1.05g/cc
Sizes: 20um-1180um (1.2mm)
[more info...]
Price: $99.00-$248.50


Grey Polyethylene Microspheres Density 1.00g/cc<br>Spherical Opaque Grey Particles for Flow Visualization and PIV
Product ID: GRYPMS-1.00
Grey Polyethylene Microspheres Density 1.00g/cc
Spherical Opaque Grey Particles for Flow Visualization and PIV
[more info...]
Price: $99.00-$248.50


Hollow Glass Microspheres - Density 0.14g/cc
Product ID: HGMS
Classified Grades of Hollow Glass Microspheres
Densities from 0.05 to 0.8g/cc
Sizes from 5um to 250um
[more info...]
Price: $99.00-$198.50


Hollow Glass Microspheres - Density 0.14g/cc
Product ID: HGMS-0.14
Classified Grades of Hollow Glass Microspheres 0.06-0.55g/cc
Various Sizes Between 5micron and 250micron.
[more info...]
Price: $112.50-$160.50


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Products 1-50 of 116