Granite Slabs & Blocks
| Size | Thickness |
|---|---|
| 250x75 cm 250x130 cm 280x160 cm |
10 mm +/- 1mm 18 mm +/- 1mm 20 mm +/- 1mm 30 mm +/- 1mm 40 mm +/- 1mm |
| Finish | Description |
|---|---|
| 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. |
| Sawn (Rough) | 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. |
| Sand Blasted | |
| Bush Hammered | |
| 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. To grind a surface with a high grit material to a uniform specification without producing a reflective surface. |
| Sanded | Sawn stone slabs are coarsely polished: this removes saw marks and leaves a semi-smooth, regular finish. |
| 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. |
| 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. |
| Grit-Blasted | 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. |
| Quality Parameter | Description |
|---|---|
| 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. |