Standard sizes of Sand-Stone  are

TILES

SLABS

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... + 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
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.