How to identify the appearance quality of marble

01Determine the pattern hue

Under the condition of sufficient light, put the selected slabs and the same batch of other marble slabs to be purchased flat on the ground at the same time, standing at a distance of 1.5m from them and carefully visual inspection. It is required that the pattern tones of the same batch of marble slabs should be basically harmonized.

02 Check surface defects

Under the condition of sufficient light, place the board flat on the ground, stand at a distance of lm from the marble slab and observe the invisible defects as no defects; stand at a distance from the board lm but not obvious at 1.5m as no obvious defects Defects: Defects that are obvious when standing at a distance of 1.5m from the plate are considered defective.

03 View mark

The marking order of marble slabs is: naming, classification, size, grade, standard.

The naming order of marble slabs is: the name of the place of origin of the blocks, the name of the characteristic color of the pattern, and the marble (code-named M).

Marble slabs are divided into two categories: general-shaped slabs (code-named N): square or rectangular slabs; special-shaped slabs (code-named S): slabs of other shapes.

There are three grades of marble slabs: excellent product (code-named A), first-class product (code-named B) and qualified product (code-named C). The classification is based on the allowable deviation of the sheet size, the allowable limit tolerance of flatness, the allowable limit tolerance of the angle, the appearance quality and the mirror gloss. Marble slabs should be marked when leaving the factory: the name of the manufacturer, trademark, and mark. So by looking at the mark, you can get an idea of the overall appearance quality of the board.