| Sandstones
standard
sizes are :
Tiles :
| Size |
Thickness |
| 300X300
mm, 400X400 mm |
15-18 mm, 25-35 mm, 40-50 mm |
| 600X300
mm, 600X400 mm |
15-18
mm, 25-35 mm, 40-50 mm |
| 600X600
mm |
15-35
mm, 40-50 mm |
Slabs :
| Size |
Thickness |
| 60x120
cm |
20-35
mm, 40-50 mm |
| 90x180
cm |
20-35
mm, 40-50 mm |
| 120xFree
Length |
20-35
mm, 40-50 mm |
Parameters definition :
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... + /- 0.5 mm
Sawn, Calibrated, 4-cut and 6-cut....
+ 1 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
One
side natural and one side honed
a. Honed finished one side.
b. Other side natural.
c. Thickness variation is + 3mm
One
side Calibrated and one side honed
a. Honed finished one side.
b. Calibration on the other side.
c. Thickness variation is + 1mm
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.
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.
Note:
The above Thickness variation mentioned is for the container
at total. The variation in tile is not acceptable.
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