Natural stone is beautiful and generous, a variety of colors, is a good material for home improvement. The quality standard of natural marble is mainly divided into three aspects: appearance quality, processing quality and mirror gloss.
1. Appearance Quality
Appearance quality also includes appearance defects, referring to missing edges, missing corners, cracks, color spots, color lines, pits, marble plates and warping, dents, stains and other appearance defects.
In the standard of natural granite and marble building plates, the appearance quality index stipulates that the hue pattern of the same batch of plates should be basically harmonized, and appearance defects are not allowed in excellent products.
The defect detection method is as follows: place the plate to be tested flat on the ground, and the defects visible at 1.5 meters away from the plate are regarded as defects; The defects that are not obvious at 1.5 meters away from the plate, but visible at 1 meter are considered to be no obvious defects; An invisible defect 1 meter away from the plate is deemed to be without defect.
2. Processing Quality
The processing quality of stone directly affects the decorative effect of stone finish, and is also the main basis for stone grade division. The technical indicators are the size deviation (length deviation, width deviation, thickness deviation), flatness tolerance, Angle tolerance.
According to the deviation and limit tolerance of these technical indicators, the plate is divided into excellent products, first-class products and qualified products. Consumers should specify the grade to be achieved in the purchase contract and avoid using products with general words such as "meeting national standards".
In each batch of products, if it is superior product, it is not allowed to have more than 5% of first-class products; If it is a first-class product, no more than 10% of qualified products are allowed to exist; If it is a qualified product, it is not allowed to have more than 10% of the non-conforming product.
3. The Gloss Unit To Distinguish Grades
In stone standards, gloss is called mirror gloss. The current natural granite plate standard stipulates that the front of the mirror plate should have a mirror luster and can clearly reflect the scenery. The mirror gloss value of the mirror plate should not be less than 75 gloss units. Most granite plates have a good mirror luster when the gloss value is 80 to 90 gloss units.
In the current natural marble plate standard, the gloss value is graded, and the lowest gloss value of the excellent product is divided into three categories according to the different chemical principal components, which are 90, 80, 60 gloss units. According to the different requirements of consumers, the value of gloss should be indicated in the purchase contract, or according to the gloss value of the agreement board as the standard.
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Jessie
Fortune East Stone
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