Everything about Microspheres
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  • Deformable Silver Coated PMMA Microsphere Spacers

    Silver Coated Glass Microspheres work well for increasing the conductivity of bond lines, but they lack the capability to deform when compressed to give increased conductive contact between the surfaces of the bond line.  These newly released Silver Coated PMMA Microspheres offer the low weight deformable pmma cores, and 250nm thick silver coating for high conductivity.

    Conductivity of this product has been measured at <0.5ohm per square with a 30% by volume preparation.  Sizes available cover both the common 50 micron (45-53um)  and 100 micron (90-106um) sizes and many others.

    These spheres are perfect for producing anisotropic (only conductive in one direction) conductive bond lines.

    Actual bond line thickness achieved will be a function of the assembly pressure and the size spheres selected.

    In addition to being high conductive these silver coated PMMA is bio-compatible.

  • Metal Coated Microspheres – Conductive Silver Coating

    From early days engineers have been looking for ways to shield circuits from electromagnetic interference (EMI). One of the most effective methods of shielding is by creating an electrically conductive enclosure around the circuit or device. This can be accomplished by using any electrically conductive material. Advances in coated microspheres have enabled the creation of light weight electrically conductive coatings that provide excellent EMI shielding.

    Silver Coated Hollow Glass MicrospheresElectrically conductive microspheres are produced by applying a metallic silver coating to the surface of the microspheres, thus giving the advantages of a metal particle with the additional properties of the core microsphere.  Typically hollow glass microspheres are silver coated as this offers the combination of a low density filler and a conductive particle.   Coatings with EMI shielding of greater than 45db have been produced by adding as little as 20% by weight of M-18 silver coated microspheres.

    Cospheric offers metal coated (silver)  electrically conductive microspheres in a variety of sizes and densities as shown in the table below, custom particle size ranges are also available:

    Product Average particle size (μm) Particle size range (μm) True particle density (g/cm3) Bulk density (g/cm3) Crush strength (psi)
    M-18 17 5–30 (std) 0.72 0.34 28000
    M-30 27 10–45(std) 0.62 0.37 18000
    M-40 36 15–70 (std) 0.49 0.35 6000
    M-45 43 15–80 (std) 0.32 0.20 2000
    M-60 74 25–120(std) 0.16 0.10 300