The stone is available in a range of eight smooth and textured finishes:
waterjet: a non-slip matt finish, produced by working the surface of the
stone with
high-pressure water jets.
honed: a smooth finish with a slight sheen, produced by using a polishing
head.
sanded: sawn stone slabs are coarsely polished: this removes saw marks
and leaves a
semi-smooth, regular finish.
cleft: with this traditional treatment the stone is riven along its line
of cleavage to reveal the
natural grain; this gives an undulating surface with great character.
gritblasted: a high-pressure airline projects coarse-grained grit onto
the top surface of the stone
producing a finish similar to cleft, but available on slabs of greater
size.
flamed: the top surface of the slab is burnt off, giving an irregular textured
finish.
textured: the top surfaces of sawn slabs are pneumatically tooled to produce
a pitted or
grooved surface.
Coating
Etching
Buffing
Using a non-abrasive
pad attached to a machine which rotates the pad in a circular fashion over
the
stone, generally
between 150-300 RPM. Polishing formulations containing micro-fine abrasive
materials are used with buffing to produce a more reflective gloss on the
surface of stone. Waxes are also used with buffing to enhance the gloss
of polished stone.
Honing
To grind a surface
with a high grit material to a uniform specification without producing
a reflective
surface.
Terrazzo
A man-made stone
composed of chips which are mixed with cement and then polished as an
economical
alternative to solid marble slabs or tiles. Care of terrazzo is identical
to the care of marble.
Terrazo 1 :
Portland CementTerrazzo
is a type of flooring using a portland cement matrix composed of marble
or granite chips, portland cement and water, to which colour pigment may
be added. Other types of
Terrazzo are
available, e.g. epoxy matrix terrazzo polyacrylate terrazzo and epoxy bonded.
Maintenance
procedures on such products should be checked with the manufacturer.
Terrazzo does
not need protection from wear; it needs protection from absorption. That
is why water based seal or impregnator should be applied soon after polishing.
This absorbed into the cement
matrix, sealing of its pores. It is important
that the terrazzo is cleaned before the sealer is applied. New terrazzo
floors should be cleaned only with a neutral pH cleaner. Following this
original cleaning allow the surface to dry, then apply the seal immediately.
Finish as specified in this manual.
Water Jet
What is Waterjet?
Waterjet technology
is a computerized cold cutting technology that can cut most materials into
any
two dimensional
shape. Stainless steel, brass, bronze, raw steel, aluminum, marble, granite,
porcelain,
ceramic, linoleum, sports flooring, and vinyl are all excellent materials
for the waterjet
process. Waterjet
cutting is a clear cold process that does not heat, harden, or distort
metals.
Waterjet cleanly
and efficiently cuts stone, ceramics, and porcelains.
Anything that
can be drawn on a computer can be cut by waterjet. Many materials like
stone,
porcelain,
and stainless steel cannot economically be cut into complex shapes in any
other way.
Acidity & Alkalinity
Opposite terms
designating a reactive condition at which substances exist. Acidity in
its simplest
definition
is the term applied to a solution with a pH of less than 7. The lower the
pH, the stronger the acidity and the higher the pH, the stronger the alkalinity.
A neutral pH (i.e. neither acidic or alkaline) is,strictly speaking, 7;
but the neutral zone, with regard to stone, is approximately 6 to 8. Another
term for alkalinity is basic and substances which are basic are called
bases. Acids and bases are reactiveto each other.
Marble and calcite
stones are basic substances and therefore react with acids. Hence, acidic
substances
such as vinegar and carbonated beverages can cause etching of marble. Granite
and
siliceous stones
are not basic and, in fact, are chemically much less vulnerable to damage
from
Abrasions
A marring of the surface of marble caused by physical trauma. The marring is generally very slight and homogeneous such that there is no distinguishable border and has no perceptible depth.
Marble Tips
When the surface of marble is scratched and loses its original shine, the marble needs to be refinished and polished in order to restore the shine it had originally.
Restoring the shine simply means to smooth the surface until it shines.
Here are three different procedures needed in succession in order to restore the original shine.
1. Grinding
Grinding is the process by which large scratches
and lippages are sanded to make the surface
even. The abrasives used have grit sizes 60 or less.
2. Honing
Honing is same as grinding except diamond abrasives with grit size of 120 or above are used.
3. Shining
2 different methods:
(1) Polishing
A powdered abrasive is used. Powdered abrasives contain aluminum oxide
or tin
oxide and usually are white. Most powdered abrasives also contain a compound
called oxalic acid which speeds the polishing process. Therefore, too much
powder
can burn the surface, so special care is needed for this process.
This procedure is most widely used.
(2) Recrystallization
This process consists of spraying a fluid onto the floor and buffing it
in with steel
wool under a standard buffing machine. The heat generated by buffing with
steel
wool reacts with the chemical producing a new compound on the surface.
This procedure is recommended when too much sunshine causes the uneven
reflections on the surface.
*Please note that the grinding and honing are very time consuming and very
messy processes because it requires lot of water for the lubrication. Some
hard stones, like a granite, need an entire day just to grind 50 square
feet.
Once the original shine is restored, a regular maintenance is required
in
order to preserve the original shine for long periods of time. For heavy
traffic
areas like a lobby in a Hotel, buffing every day using a steel wool pad
with
special chemical is all you need for keeping the original shine for several
years.
If a regular maintenance is performed routinely, the grinding process can
be
eliminated when a refinishing service is needed resulting in cost savings.