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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.


Products 1-101 of 101
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Bondline Spacer Spheres - Monodisperse Solid Soda Lime Microspheres - Calibration Grade Beads
Item #: S-SLGMS -
Price: $201.43-$635.09
Item #: S-SLGMS - View

Bondline spacer grade solid soda lime glass microspheres are available with tight particle size ranges to achieve bondline thickness (gap) from 10micron (0.01mm) to 500micron (0.5mm). Bondline... [more info...]

Monodisperse Silica Microspheres - Spherical Silica Beads
Item #: SiO2MS -
Price: $202.07-$331.66
Item #: SiO2MS - View

Silica spheres are manufactured using proprietary technologies which allow the essential properties of amorphous silica to be maintained while simultaneously achieving controlled spherical shape and... [more info...]

Microspheres, Spheres, Micro beads - PMMA - Poly(methyl Methacrylate) - Acrylic Spherical Particles
Item #: PMMA -
Price: $144.34-$481.13
Item #: PMMA - View

PMMA polymer is an amorphous, transparent and colorless thermoplastic that is hard and stiff. It has good abrasion and UV resistance and excellent optical clarity. PMMA spheres are soluble in... [more info...]

Bulk Grades of Solid Soda Lime Glass Microspheres 2.5g/cc. Optional Fluorochemical and Silane Coatings.<br>Mean Diameters 3-6um, 8-12um, 35-45um, 65-75um.
Item #: P2000 -
Price: $66.72-$223.24
Item #: P2000 - View

P2011SL: Median diameter (D50) between 3 and 6 micron, with a top size of 20 micron. P2015SL: Median diameter (D50) between 8 and 12 micron, with a top size of 36 micron. P2020SL: Median diameter... [more info...]

300 Series Stainless Steel Microspheres
Item #: SSMMS -
Price: $133.37-$334.87
Item #: SSMMS - View

Particles in Size Range: >90% Sphericity: >90% Density: 7.7-7.9g/cc Vickers Hardness: ~200HV [more info...]

Highly Opaque White Polyethylene Microspheres, Polymer Beads, Particles
Item #: WPMS -
Price: $133.37-$478.24
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...]

Retroreflective Half-Shell Aluminum Coated Solid Glass Microspheres
Item #: P2453BTA -
Price: $133.37-$714.64
Item #: P2453BTA - View

The spheres are offered in dry powder form with the following coating options: Uncoated - no surface treatment Silane Coating (S2) - for improved dispersion in aqueous systems (~76 degree contact... [more info...]

Borosilicate Solid Glass Microspheres 2.2g/cc<br>Many Sizes 20micron to 6150mm
Item #: BSGMS -
Price: $67.36-$402.80
Item #: BSGMS - View

Solid borosilicate glass microspheres are available in a large variety of particle size ranges from 10um to 6150um. Microspheres are supplied as a dry powder. [more info...]

Fluorescent Red Polyethylene Microspheres Density 0.99g/cc Bright Fluorescent Red Particles 605nm Peak
Item #: UVPMS-BR-0.995 -
Price: $133.37-$478.24
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...]

Barium Titanate Solid Glass Microspheres and Spheres
Item #: BTGMS -
Price: $67.36-$1,148.30
Item #: BTGMS - View

Barium Titanate glass spheres offer a higher Refractive Index (n) than most other glass formulations. Depending on the grade of material, reflecting index of Barium Titanate glass is between 1.9 to... [more info...]

Polystyrene Microspheres 1.07g/cc - highly spherical thermoplastic biocompatible microparticles
Item #: PSMS -
Price: $334.87-$586.02
Item #: PSMS - View

Properties of Polystyrene Microspheres Polystyrene microspheres are in their most pure form, with no surface functionalization, coatings or colorants added. Crosslinked polystyrene is inert,... [more info...]

Precision Polished Soda Lime Glass Spheres - Calibration Glass Spheres - Reference Polished Glass Particles
Item #: P-SLGS -
Price: $60.62-$635.09
Item #: P-SLGS - View

Diameter Tolerance: ±20um Roundness/Sphericity: ≤20um; >99% (Ratio of Width/Length) Density: 2.5g/cc+/-0.1g/cc Index of Refraction: 1.5284 Softening Temperature: 718°C Melting Point: 1445°C... [more info...]

Blue Polyethylene Microspheres Density of 1.00g/cc <br>Spherical Particles for Flow Visualization and PIV
Item #: BLPMS-1.00 -
Price: $133.37-$382.98
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...]

Fluorescent Yellow Microspheres Density 1.00g/cc for Flow Visualization and PIV<br>Bright Fluorescent Yellow-Green Particles with UV and Visible Illumination
Item #: UVPMS-BY2-1.00 -
Price: $133.37-$478.24
Item #: UVPMS-BY2-1.00 - 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: $133.37-$478.24
Item #: UVPMS-BO-1.00 - View
Conductive Silver-Coated Glass Microspheres, Beads, Particles
Item #: SLGMS-AG -
Price: $133.03-$334.87
Item #: SLGMS-AG - View

Also see: Other Conductive Spheres: Conductive Silver Metal Coated Microspheres Other Soda Lime Spheres: Solid Soda Lime Glass Spheres and Microspheres ... [more info...]

PE Nanospheres
Item #: PENS -
Price: $201.43-$275.85
Item #: PENS - View
Conductive Silver Metal Coated Hollow Glass Microspheres
Item #: HGMS-AG -
Price: $133.37-$1,995.15
Item #: HGMS-AG - View

Conductive hollow glass microspheres have low particle densities and so provide a significant weight reduction when used in place of conventional conductive fillers such as solid silver particles. A... [more info...]

Red Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron
Item #: FMR -
Price: $133.37
Item #: FMR - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Fluorescent Red Polyethylene Microspheres Density 1.20g/cc Bright Fluorescent Red Particles 605nm Peak
Item #: UVPMS-BR-1.20 -
Price: $133.37-$478.24
Item #: UVPMS-BR-1.20 - View
Green Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Item #: FMG -
Price: $133.37
Item #: FMG - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Yttria Stabilized Zirconia Solid and Holow Microspheres and Spheres 4-6g/cc - 5um to 1600um (1.6mm) yttrium stabilized zirconia powder, spherical powder, microspheres, microbeads, particles, density of 6.0g/cc
Item #: YSZ -
Price: $132.79-$253.40
Item #: YSZ - View

Yttria-stabilized zirconia microspheres and spheres (ZrO2 / Y2O3) are supplied as a dry powder. With operating temperatures up to 1000°C, a melting point of ~2700°C, and density of ~6g/cc, these... [more info...]

Conductive Silver Coated Poly(Methyl Methacrylate) Acrylic Microspheres
Item #: PMMA-AG -
Price: $127.02-$468.30
Item #: PMMA-AG - View

Sphericity varies by Product Code: PMMAMS-AG: These are highly spherical particles. Greater than 95% of particles are spherical. PMPMS-AG: Also highly spherical grade, with occasional minor... [more info...]

Conductive Silica Spacer Beads - Silica Microspheres Monodisperse
Item #: SiO2MS-AG -
Price: $358.60
Item #: SiO2MS-AG - View

SiO2MS-AG-4.1 2.0um - 200mg -- Coated with ~85nm of silver SiO2MS-AG-3.5 4.5um - 500mg -- Coated with ~110nm of silver SiO2MS-AG-2.3 9.0um – 500mg -- Coated with ~75nm silver We also offer... [more info...]

Fluorescent Red Polyethylene Microspheres Density 1.090g/cc<br>Bright Fluorescent Red Particles 605nm Peak.
Item #: UVPMS-BR-1.090 -
Price: $133.37-$382.98
Item #: UVPMS-BR-1.090 - View
Fluorescent Red Polyethylene Microspheres Density 1.050g/cc<br>Bright Fluorescent Red Particles 605nm Peak.
Item #: UVPMS-BR-1.050 -
Price: $133.37-$275.85
Item #: UVPMS-BR-1.050 - View
Blue Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter
Item #: FMB -
Price: $133.37
Item #: FMB - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Orange-Yellow Fluorescent Microspheres 1-5micron (um) - Emission Wavelength Spectra 594nm Peak, Excitation Wavelength Specta 460nm Peak
Item #: FMOY -
Price: $133.37
Item #: FMOY - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Red Polyethylene Microspheres Density 1.070g/cc<br>Bright Red Polymer Spherical Microparticles
Item #: REDPMS-1.070 -
Price: $133.37-$168.40
Item #: REDPMS-1.070 - View
Fluorescent Green Polyethylene Microspheres<br>Bright Green Polymer Beads Density 1.015g/cc
Item #: UVPMS-BG-1.015 -
Price: $132.00-$382.98
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 Microspheres vs Micropellets vs Microparticles: Microspheres:... [more info...]

Bondline Spacer Spheres - Monodisperse Solid Borosilicate Glass Microspheres - Calibration Grade Glass Beads
Item #: S-BSGMS -
Price: $403.51
Item #: S-BSGMS - View

Bondline spacer grade solid borosilicate glass microspheres are available with tight particle size ranges to achieve bondline thickness (gap) from 87micron to 197micron (0.2mm). Bondline spacers are... [more info...]

Red Polyethylene Microspheres Density 1.065g/cc<br>Bright Red Polymer Spherical Microparticles
Item #: REDPMS-1.055-1.065 -
Price: $133.37
Item #: REDPMS-1.055-1.065 - View
Yellow Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter
Item #: FMY -
Price: $133.37
Item #: FMY - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Fluorescent Green Polyethylene Microspheres Density 1.035g/cc<br>Bright Green Polymer Spherical Microbeads
Item #: UVPMS-BG-1.035 -
Price: $133.37
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...]

Orange Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron in diameter.
Item #: FMO -
Price: $133.37
Item #: FMO - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Violet Fluorescent Microspheres 1-5micron (um) - Emission Wavelength 636nm Peak, Excitation 584nm Peak
Item #: FMV -
Price: $133.37
Item #: FMV - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Fluorescent Orange Polyethylene Microspheres Density 1.015g/cc<br>Bright Orange Polymer Spherical MicroBeads
Item #: UVPMS-BO-1.015 -
Price: $133.37-$168.40
Item #: UVPMS-BO-1.015 - 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: $155.24-$275.85
Item #: UVPMS-BY2-1.02 - View
Fluorescent Green Polyethylene Microspheres<br>Bright Green Polymer Beads Density 1.01g/cc
Item #: UVPMS-BG-1.01 -
Price: $133.37
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...]

Aluminum-Coated Solid Barium Titanate Glass Microspheres 4.2g/cc - 30-100um Diameter
Item #: BTGMS-Al -
Price: $168.40
Item #: BTGMS-Al - View

Physical Characteristics: Coating: Fully Aluminum Coated (~500nm thickness) Core: Solid Barium Titanate Glass Spheres Density: ~4.2g/cc Appearance: Grey powder [more info...]

Fluorescent White Microspheres 1-5micron (um) - Broad spectrum fluorescence
Item #: FMCL -
Price: $133.37
Item #: FMCL - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Orange-Red Luminescent, Ultraviolet Fluorescing Polymer Microspheres 1 - 5micron
Item #: FMOR -
Price: $133.37
Item #: FMOR - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Fluorescent Green Polyethylene Microspheres<br>Bright Green Polymer Beads Density 1.02g/cc
Item #: UVPMS-BG-1.02 -
Price: $133.37
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...]

Thermoset polymer pink fluorescent microspheres 1 to 5 micron in diameter.
Item #: FMPK -
Price: $133.37
Item #: FMPK - View

Product Features and Benefits: Thermoset amino-formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Magenta (Red-Purple) Fluorescent Microspheres 1-5micron (um) - Emission Wavelength 613nm Peak, Excitation 575nm Peak
Item #: FMMG -
Price: $133.37
Item #: FMMG - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Reddish-Pink Fluorescent Microspheres 1-5micron (um) - Emission Wavelength Spectra 609nm Peak
Item #: FMCE -
Price: $133.37
Item #: FMCE - View

Product Features and Benefits: Thermoset amino formaldehyde polymer. Inert fluorescent polymer, highly cross-linked for use in applications where the avoidance of swelling, bleeding, migration or... [more info...]

Fluorescent Red Polyethylene Microspheres Density 0.99g/cc Bright Fluorescent Red Particles 605nm Peak
Item #: UVPMS-BR-0.975 -
Price: $133.37-$275.85
Item #: UVPMS-BR-0.975 - View

Density: 0.965g/cc - 0.985g/ccDaylight Color: Fluorescent Red (607nm Peak) Fluorescent Response: Fluorescent Red under 300-550nm wavelengths. Works well with Green Lasers. Peak emission of 607nm... [more info...]

Fluorescent Flesh-Tone Polymer Microspheres - Hospital Cleaning and Disinfection Contaminant Studies
Item #: UVSKPMS -
Price: $235.43-$382.98
Item #: UVSKPMS - View

The small size and spherical shape of the particles allow the powder to spread easily on most surfaces, creating a thin layer of powder, invisible to the naked eye under daylight illumination. W... [more info...]

Cerium Stabilized Zirconia Solid Microbeads and Beads 6g/cc - 600um to 2000um (2mm)  cerium stabilized zirconia powder, spherical powder, microspheres, microbeads, particles, density of 6.0g/cc
Item #: CSZMB -
Price: $132.79
Item #: CSZMB - View

Cerium-stabilized zirconia microspheres and spheres (CeO4Zr) are supplied in dry form. With operating temperatures up to 1000°C, a melting point of ~2700°C, and density of ~6g/cc, these solid... [more info...]