white, dust-free, powdery form, grain size is 0 - 0.032 mm, density is 2.4 g/cm³ (powder density is 1.2 g/cm³)
Fused aluminia is a filler used for making light coloured moulding material which takes well to being machined. In relation to the finished mixture, it is added at a ratio of 1 to 1.25 times parts per weight to the individual components before they are mixed together.
Most casting resins can be filled with various types of filler. Fillers are used for wall thicknesses from about 25 mm in order to achieve the following: lessen the amount of shrinkage, save money, reduce the weight of the cast piece, change the working attributes of the material (putties), influence the final attributes or the appearance of the material, reduce the reaction temperatures and thereby the working life when casting large items.
The mixing ratio between the already mixed casting resin mixture and the filler depends on the type of filler being used and the attributes you want to achieve. A PUR quick casting resin which has a mixing ratio of 1:1 (e.g. G26) lends itself to the following mix preparation: 1 kg resin to 1 kg hardener with 2 to 3 kg filler. When adding filler, one half of the dry filler should be stirred into the resin and the other into the hardener. In the case of polyurethane casting materials, you should begin with the component which does not contain isocyanate so that the water-sensitive isocyanate component can remain closed for as long as possible.
Fused aluminia (aluminium hydroxide)
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