Moulded compounding mixtures of adjustable density

摘要

There is provided a method for preparing cured moulded article of a predetermined density of from 1.66 to 9.0 which comprises selecting the resin and determining it % weight loss and % porosity under the curing conditions for the selected resin, then selecting a high density filler and a low density filler and resolving the equation: <IMAGE> wherein K is the desired density of the end product and has a value of from 1.66 to 9.0; HD is the density of the selected high density substantially water-insoluble material and has a value of above 3.2; ID is the density of the selected medium density substantially water-insoluble material and has a value of from 1.5 to 3.2; R is the density of the cured binding resin and has a value between 0.8 to 1.5; A is the percentage by weight of the selected high density filler having the density HD and has a value of from 10 to 90%; B is the percentage by weight of the selected medium density filler having the density ID and has a value of from 0 to 86%; C is the percentage by weight of the selected binding resin having the density R and has a value of from 4 to 70%; and Y is the porosity of the end product expressed in % of the volume of the moulded object.