Item Price Qty
1/2 Gallon (4 oz)
Carton (3 lbs)
Carton (6 lbs)
Glass Microspheres

Lightweight, Sandable Filler for Surface Layers

When blended with resin, these hollow glass spheres make a lightweight, sandable filler, perfect for filling in fabric weave, shallow blisters, and the surfaces of core materials. The average bubble is less than 70 microns, about a quarter of a grain of salt. Select this unique size and shape for a variety of reasons:

  • Tiny spheres blend readily for an evenly spreadable paste.
  • They're adaptable to a variety of production processes such as spraying, casting, and molding.
  • Low density reduces weight, lowers costs, and enhances properties for finished parts.
  • Spheres provide lower viscosity and improved flow, and reduce shrinkage and warp.

This filler is compatible with epoxy, polyester, and vinyl ester resin systems. Add filler after adding catalyst to resin.

Mix ratio is 3:1 (filler to resin by volume).

Fillers, when ordered alone, will typically ship in a small or medium box. Where possible, we will combine ordered items to reduce the number of boxes shipped.
Glass Microspheres

Glass Microspheres available in two sizes:
One 1/2 gallon (#22-A)
One carton (#22-B)