Polyethylene Microspheres

Cospheric LLC specializes in a large selection of polyethylene microspheres in particle size from 1um to 1mm. 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) charged. Black microspheres can be manufactured with magnetic 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 microspheres 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. 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 (un-pigmented) polyethylene. Opaque microspheres are truly opaque (will not transmit light even in a 50um monolayer). Manufacturing Process: No solvents or volatiles are used. Pigments and additives can be incorporated as needed.