Quality Standards for Metal Stone Display Frames

The production of metal stone display frames must follow precise technical and aesthetic standards to meet client expectations and ensure visual appeal for end-users.

First, the surface of the display frame must be smooth and uniform, without scratches or irregularities. The coating should be evenly colored, with no visible defects such as flaking, exposed substrate, or embedded particles. All edges and corners accessible to users must be rounded and free of sharp burrs.

Second, coating adhesion must achieve Grade 2 or higher according to GB/T 9286-1998. Welded joints must be strong, continuous, and reliable.

Third, all metal components require anti-corrosion treatment to ensure long-term durability, especially in varied environmental conditions.

Fourth, coating thickness on primary structural elements should not be less than 40μm for spray or powder coatings. Electro-galvanized layers must meet the specifications of Section 7.5 in GB/T 15675-2008, while hot-dip galvanized coatings must comply with Section 7.7 of GB/T 2518-2008.

Fifth, welds should be consistent and free of defects such as cracks, incomplete fusion, porosity, or slag inclusion.

Sixth, the hardness of sprayed finishes must satisfy Grade H or above as stipulated in GB/T 6739-2006.

These six criteria define essential quality benchmarks in the manufacturing of metal stone display racks. Specifications related to wooden display frames will be detailed separately in a subsequent guide.