Hollofill is composed of hollow glass spheres, less than 0.5mm in diameter. It looks like light grey powder but is very free-flowing. Hollofill has a bulk density of 0,4g/cm³ and a specific gravity of 0,77g/cm³. This makes it the ideal lightweight filler. The hollow spheres are strong enough to withstand processing and mixing, and are chemically inert. Hollofill melts at around 1250ºC. The coefficient of thermal conductivity is 0,09W/mk. Hollofill has a volume filling capacity of 52%. Because of the free-flowing characteristic of the spheres, it can be used as a filler at very close to its saturation point. In a resin with a desity of 1g/cm³, Hollofill can be added at 100% by volume, ie. 770g/Kg. The resultant composite density will be 0,885. Very few fillers are available which will reduce the density of resins. Even fewer fillers are available which will have virtually no detrimental effects on the flow properties of composites at a 50% volume addition. To sum it up, the benefits of Hollofill in resins and related products are as follows: Reduced cost. Reduced weight. Improved insulation. Improved fire resistance.
Packaging: 7,5Kg thick polyethylene bags.
Typical chemical analysis: