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FAQ and Resources

This section is a compilation of all kinds of useful data and information relating to microspheres and their numerous applications in the industry, as well as academic research. All you ever wanted to know about microspheres - technical articles, protocols, microsphere links, applications, frequently asked questions (FAQ), reference tables and more.

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FAQs regarding ordering microspheres and nanospheres. Shipping policies, taxes and customs fees for international shipping.
FAQs on microspheres shelf life and storage requirements, hydrophobicity and surface properties, dispersing hydrophobic microspheres in an aqueous solutions.
Calculation table for the number of microspheres per gram of spherical powder (polyethylene, glass and silica microspheres, spheres and nanospheres). The higher the density of each sphere, the lower the number of spheres in each gram of the material.
A procedure for mixing Tween solutions to facilitate the suspension of hydrophobic particles in water. Applications include, but are not limited to, suspending particles for use as density marker beads in Percoll or other gradients, or for use in flow visualization.
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.
Fluorescent microspheres are round spherical particles that emit bright colors when illuminated by UV light. Ability to emit intense color under UV (black light) illumination provides contrast and visibility of microspheres relative to background materials.
Precision microspheres and spherical powdes offer benefits in a wide variety of applications - spacers and tracer particles, fillers, medical spheres, fluorescent markers, density marker beads, flow visualization and more.
Retro-reflection is a type of reflection that redirects incident light from the sign face back to the source, for example to the vehicle headlights. Retroreflection is achieved through either glass beads or microprisms imbedded in the sheeting.
The experiment might require the microspheres to stay in suspension for a long time, without settling or agitation, or a desired settling velocity might need to be achieved for testing a particular instrument.
Microspheres used to manufacture and test medical devices are typically solid particles that are made from robust and stable raw materials such as polymers, glass, and in some cases, ceramics. Different types and grades of microspheres are available and selected based on specific application requirements.
Electrostatic charge (also known as triboelectric charge) on microparticles and microspheres have been of interest to scientists in chemical, pharmaceutical, cosmetic, drug delivery, displays and other industries for many years. Until recently there were no reliable techniques to measure or quantify electrostatic charge.
Metallizing is a process of creating a metal coating a non-metallic substrate. Microparticles such as microspheres, beads and spheroid powders are often metallized to create conductive spherical powder or retroreflective spheres.
Colored neutrally-buoyant polymer beads from Cospheric are used to measure frictional drag on a test surface.
Microspheres are well known in the coatings industry for their use as low-surface-area fillers that offer benefits in viscosity and density control, solids content, application and flow characteristics. Particle size ranges from 10-25 microns up to 850-1,000 microns are available and supplied as a dry powder that can be easily mixed into coatings, adhesives and oils.
Due to the dipole the sphere will rotate in electromagnetic field to align more positive hemisphere to the negatively charged stimuli and vise versa. As the spheres align themselves, the viewer will observe the color of one hemisphere, while the other hemisphere will be hidden from view.
The safety of Polyethylene has been assessed by the Cosmetic Ingredient Review (CIR) Expert Panel. The CIR Expert Panel evaluated the scientific data and concluded that Polyethylene was safe for use in cosmetics and personal care products.
Even though glass and polyethylene micropsheres of comparable diameters and size distributions are available on the market, their inherent material properties make them suitable for different applications.
A comprehensive guide on what measurement uncertainty is, where it comes from, how it is calculated, and how it applies to particle size (diameter) measurements of Cospheric microspheres.
Compilation of articles using Cospheric products as a reference source for customers.
Custom particle size classification services to grade your particles, powders or aggregates to size. We can grade your particles to any size between 15um (0.00059 inches) and 5.6mm (0.220 inches). The table shows cut sizes that we can currently grade to. Custom cut sizes are available by request.
Useful Links on Microspheres, Microparticles, Spherical Powders - Custom Density, Color, Retroreflectivity

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About the Company:

Cospheric is a global leader in manufacturing and distribution of precision nanospheres, microspheres, and larger precision spherical particles. Scientists and engineers worldwide rely on us as a proven source to fulfill their needs for microparticles in narrow size ranges, wide selection of colors, densities, properties and formulations. We leverage our extensive technical expertise in micropowders to help each customer find an optimal microparticle solution for their needs. We ship worldwide daily out of our Santa Barbara, CA manufacturing facility.
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