A fine white powder made up of 3M microscopic hollow glass bubbles. Use with polyester or epoxy resin to make light weight structural putties for fairing. Use with fumed silica to improve thickening and thixotropic properties. Do not use for mixtures intended to be used as adhesives/glues.

Low density (0.25 g/cc) and high isostatic strength make 3M™ Glass Bubbles K25 ideal additives for shallow water buoyancy applications or processing applications where high strength is needed.
In addition, like all 3M glass bubbles, K25 bubbles are compatible with polyurethane, polypropylene and epoxy, and are virtually insoluble in water.

Sold as 80 LB box = $621.60