for example such fillers as alumina trihydrate may be added in amounts as high as all the other ingredients combined or more to impart desirable flame resistance other inert inorganic fillers may also be used such as calcium carbonate mica and sand or ground silica if alumina trihydrate is used it may be used in any amount which can be handled for example in amounts from about 10 to about 55 by weight of the finished product may be alumina trihydrate having a particle size of about 20 200 microns we prefer to use particles of a composition comprising about 20 linear pmma not crosslinked about 80 crosslinked copolymer pmma ba 97 to 3 ratio of methyl methacrylate to butyl acrylate and 0 3 dyes or pigments while the particles can be beads specially made in aqueous suspension for use in the present invention and therefore can have a controlled size we prefer to use ground particles made from previously cured products for example the ground particles can be made from crushed scrap in an acrylic sheet manufacturing facility the scrap or other preformed acrylic product is first crushed and then ground or impacted to make particle sizes predominantly from about 0 1 mm to about 2 0 mm in their shortest dimensions preferably having a range of 0 2 mm to 0 5 mm to make a product having the appearance of granite no more than about 1 of the particles should have a short dimension of greater than about 0 5 mm that is no more than about 1 should be retained on a sieve having openings of 0 5 mm the syrup should be rich in methyl methacrylate monomer.