Cultured marble is a mixture of polyester
resin (an oil by-product) and limestone (quarried out of the
A mixture is made up and poured into
molds much like concrete. We mix the product by pouring the resin
(looks like syrup) into a dough mixer. We add a chemical hardener
and then add titanium (in a powder form) to make the product
whiter. Then we add the limestone and mix this for several minutes.
Then we put the marble, color and tint on top of the batch while
it is sitting in the dough mixer. This will be the veining in
the marble. This batch is poured by hand into molds that have
been previously sprayed with a clear gel coat. The gel coat is
20 mils thick and protects the product from staining. The product
bonds to the gel coat and hardens in a few hours. We remove it
from the molds the next day. The edges are ground and the product
is buffed. It is then ready for installation. Cultured onyx and
granite are made much the same way with a few minor differences.