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QUALITY - Marbles |
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Granites |
Sandstones |
Slates |
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| Standard sizes
are: |
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| Tiles: |
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Sizes |
Thickness |
305X305
mm, 457x457 mm
300x300mm, 400X400 mm |
10
mm, 12 mm, 18
mm, 20 mm
25 mm, 30 mm, 40 mm |
| 600X600
mm |
18
mm, 20 mm 25 mm,
30 mm, 40 mm |
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| Slabs: |
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Sizes |
Thickness |
| 250x75
cm |
18 mm,
20 mm, 30 mm, 40
mm |
| 250x130
cm and above |
18 mm,
20 mm, 30 mm, 40
mm |
| 280x160
cm |
18 mm,
20 mm, 30 mm, 40
mm |
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| Parameters
definition: |
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Polished - To
smooth or brighten a
surface increasing the
reflective quality and
luster by chemical or
physical processes.
Generally gloss levels
should be + 90 as
measured by a gloss
meter. To achieve this,
final polishing should
have been done by latest
Italian/ French machines
using imported
abrasives.
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.
Honed: To grind a
surface with a high grit
material to a uniform
specification without
producing a reflective
surface.
Sawn - i.e.
unpolished. It is not
advisable to buy this
way because : floor
polishers do not give as
good a polish as factory
machine polishers. many
defects are not visible
easily before polishing.
Calibration: To
grind a surface with a
high grit material to a
uniform surface to
maintain the thickness
variation.
Gangsaw: To grind
two sides of the stone
surfaces with a high
grit material to a
uniform specification
without producing a
reflective surface.
Shade variation -
Slabs / tiles should be
sorted to ensure
uniformity of shade.
Normally, any colour can
be sorted into three
shades. Sorting is
simple -just lay all the
material on the floor
and look from different
directions.
Colour patches -
These are darker or
lighter patches or bands
of single colours due to
mineral localisation.
Scratches: The
marring of the surface
caused by physical
trauma such as small
stones or sand embedded
in shoes scraping across
a marble floor.
Staining : The
absorption of foreign
pigments or oils into
the porous stone causing
discoloration.
Double color -
Sometimes two different
grain sizes occur in the
same slab, giving the
appearance of a double
colour.
Free lengths:
i.e. lengths varying
randomly while width is
constant are also very
attractive. Choose the
widths as per the
expected floor area. Buy
random lengths and cut
at your site to fit.
Flatness Tolerances
A 4’ dimension in any
direction on the surface
shall determine
variation from true
plane, or flat surfaces.
Such variations on
polish, hone, and fine
rubbed surfaces shall
not exceed tolerances
listed below or 1/3 of
the specified joint
width, whichever is
greater. On surfaces
having other finishes,
the maximum variation
from true plane shall
not exceed the tolerance
listed below or + 3 mm
of the specified joint
width, whichever is
greater.
Polished, honed or fine
rubbed finishes... + 0.5
mm
Sawn, Calibrated, 4-cut
and 6-cut.... + 1 mm
Edges also can be
chamfered / bevelled.
Chamfering removes
whiteness and chipped
edges. This looks very
good. Chamfering is a
simple process in which
a polishing brick is run
at an angle of 45o.
DIAGONAL OUT
DIAGONAL OUT MUST NOT BE
MORE THAN 1MM FOR TILES.
IN SLABS IT VARIES.
Quality Details :
Polished Marble
a. One Side Fine
Mirror Polished.
b. Gangsawn/Cutter side
c. Thickness variation
is + 0.5 mm to 1 mm
depending upon
Tile/Slab. |
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Granites |
Sandstones |
Slates |
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