Polished -
generally gloss levels
should be 0-15 as
measured by a gloss
meter. To achieve this,
final polishing should
have been done by
italian machines.
Honed: To grind a
surface with a high grit
material to a uniform
specification without
producing a reflective
surface
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.
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... + 1
mm
Sawn, Calibrated, 4-cut
and 6-cut.... + 1.5 mm
Split face, pointed or
other rough cut
finishes... + 3 cm "
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 45 °.
DIAGONAL OUT DIAGONAL OUT MUST
NOT BE MORE THAN 1MM FOR
TILES. IN SLABS IT
VARIES.
Quality Parameters:
Natural slates:
a. Both Side Natural.
b. Thickness variation
is + 10-20mm
One side natural and
one side calibrated
a. One side Calibrated.
b. Other side natural.
c. Thickness variation
is + 3mm
Price: Natural
material cost + US $4-5
per Sq.Mtrs
One side natural and
one side honed a. Honed finished
one side.
b. Other side natural.
c. Thickness variation
is + 3mm
Price: Natural
material cost + US $4-5
per Sq.Mtrs
One side Calibrated
and one side honed a. Honed finished
one side.
b. Calibration on the
other side.
c. Thickness variation
is + 1mm
Price: Natural
material cost + US $7-8
per Sq.Mtrs
One side
Calibrated and one side
mirror polished a. One Side Fine
Mirror Polished.
b. Calibration / Honed
on the other side.
c. Thickness variation
is + 1mm.
Price: Natural
material cost + US
$12-13 per Sq. Mtrs
One side Calibrated
and one side fine mirror
polished( with max.
gloss) a. One Side Fine
Mirror Polished.
b. Calibration / Honed
on the other side.
c. Thickness variation
is + 0.5 mm including
all corner of the stone.
Price: Natural
material cost + US $16
per Sq. Mtrs
Note: The above
Thickness variation
mentioned is for the
container at total. The
variation in tile is not
acceptable.
