In the natural granite and marble building board standards, the appearance quality index stipulates that the color tone pattern of the same batch of plates should be basically reconciled, and the appearance defects are not allowed in the superior products.
The defect is detected by placing the inspected plate flat on the ground, and the defect visible at 1.5 m from the plate is considered to be defective; the defect is not obvious at 1.5 m from the plate, but the defect visible at 1 m is regarded as inconspicuous. Defects; defects that are invisible 1 meter away from the sheet are considered to be defect free. Since the color difference of natural stone is common, it is better for the user to select the protocol board after selecting the stone type. This is especially true when ordering large quantities. The protocol board should be as large as possible, and the color tone pattern of the variety should be fully displayed. The agreement board should also allow each party to hold one piece in order to unify the standards and avoid unnecessary disputes.
Marble testing standard
This standard applies to natural marble sheets for construction, and other uses of natural marble sheets can also be used as reference.
(1) Product classification: (divided into the following according to the shape)
1 general board
2 Arc plate---The same veneer plate at the radius of curvature of the decorative surface contour.
grade:
1: The normal version is divided into three grades: grade (A), first grade (B) and qualified (C) according to the specification dimensional deviation, flatness tolerance, angular tolerance and appearance quality.
2: The circular plate is divided into three grades: superior product (a), first-class product (B) and qualified product (C) according to dimensional deviation, straightness tolerance, line profile tolerance and appearance quality.
3, mark
Marking order: place name, pattern tonal feature description, marble; number, category, size, grade, standard number.
Cross countersunk head bolts are applicable to situations where the head of the Screw is not allowed to be exposed, but the corresponding conical countersunk hole must be made on the surface of the part with through hole. Common in machinery, electrical appliances and buildings. It is used to connect two connected parts. One part is made into a through hole, and the other part is made into a threaded hole.
Hexagon Socket Head Cap Bolts,Hexagon Socket Head Cap Screws,M6 Hexagon Socket Head Cap Screws,Hexagon Socket Head Cap Bolt
Jiangsu Jiajie Special Screw Co., Ltd , https://www.jiajiescrewcompany.com