 |  | | Technical Data
The estimate of the quality of the product must be carried out by transparency, over a bottom illuminated uniformly from a distance of 3 meters and without a previous approach to the glass. Any fault, which isn't visible under these conditioning, is not considered a defect. It won't neither be considered a defect the chips in the layer with a diameter of less than 1 mm, in the central pert of the piece, provided that they are fewer than 5 per m2, or those which are between 1 and 1,5 in diameter if they are closer than 75 mm from the harder of the piece, without limit of numbers. It won't neither be considered a defect the scratches of less than 15 mm in the periphery previously mentioned, nor the faults of shadow or slight variation in colour, reflection or light transmission. These criteria are applicable to products issued in a fixed measure, aimed to direct use. In standard measure for storage and cut, higher tolerances are admitted. | |
