variation in distribution the microscope photo of fig4 shows a sample of an aerogel containing composite made according to the invention using loose stone wool fibers the aerogel particulate material can be seen as small dots or grains the fibers are also visible as can be seen the aerogel particulate material and fibers are substantially homogeneously mixed on a 1 mm scale the microscope photograph of fig5 shows the mixture of aerogel particles and fibers in the panel according to the invention the two largest particles are measured to 481 u03bcm and 302 u03bcm the composition of the analyzed panel was approximately 51 wt aerogel particles 38 wt mineral wool fibers and 11 wt binder similarly the microscope photograph of fig6 shows the mixture of aerogel particles and fibers in the panel according to the invention in larger magnification there is no sign that the binder attaches to the aerogel particles this is considered highly beneficial as mentioned above in the testing a dry phenol formaldehyde polymer binder powder was used of the type sold by dynea under the trade name u201c prefere 94 8182u7 u201d binder content in the test was 12 wt to be sure that the boards produced had sufficient strength curing time in initial tests started at 7 minutes and was subsequently raised to 14 minutes to be sure of proper curing fig7 and 8 are comparative examples showing composites not produced according to the invention fig7 is a photograph showing the result.