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How many grams of spheres do you need to purchase in order to have the correct number of spheres required for the experiment? Do you need to count the number of microparticles flowing through the device? Look it up using the spheres per gram reference tables below.
The number of spheres per gram is proportional to the true particle density (TPD) of the material, and, therefore, knowing the correct density of the material is critical. The higher the density of each sphere, the lower the number of spheres in each gram of the material.
No microsphere product is perfectly monodisperse (uniform in diameter). There is always some size distribution of particles. The tables below are designed to correlate with Cospheric's standard microsphere sizes and the corresponding particle size distributions. Our calculations are based on the assumption that average diameter is the average of upper and lower diameter specifications.
Note: This table assumes the mean diameter is half way between the upper and lower size. For microspheres with different densities than those listed, use the number from the density ~1g/cc column and divide by the actual density.