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Matrix Data |
Two types of basic matrices are used in the installation
of Terrazzo, namely Portland cement and chemical
binders. The use of color pigments in the matrix
makes special design effects possible, however,
with Portland cement, no more than 2 lbs. of pigment
per bag should be used. Colored matrices allow
the creation of unique designs and also permit
the regulation of the binder color to harmonize
with chip colors.
Portland Cement: Both white and gray Portland cement
are used in the installation of terrazzo. The cements
are identical in structural properties and both
conform to A.S.T.M. Specification C-150 Type-1
Portland Cement. Since both white and gray Portland
cement are manufactured in many different areas
using a variety of raw materials, there may be
some color variation between the various proprietary
brands and sources of materials. White Portland
cement is widely used in terrazzo since its color
is precisely controlled and also because it combines
readily with tinting pigments to provide a clear,
uniform color. Gray Portland cement is less likely
to provide a uniform color and although it can
be tinted, does not provide the degree of clarity
achieved with the white variety. Gray cement normally
costs less than white cement.
Chemical Matrices: Epoxy resin Terrazzo, Polyester
resin Terrazzo and Polyacrylate Terrazzo are referred
to as containing special chemical matrices. The
materials are usually more resistant to harsh chemicals
and can be applied in a thinner cross-section than
standard terrazzo. Also considered a special matrix
is Conductive Terrazzo, where Epoxy and Polyester
resin only can be used as the binder. Because these
materials are applied in a thin section they usually
utilize only chip sizes # 0 and # 1. |
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