Interior wall tiles are a type of ceramic tiles, primarily used for interior wall decoration. They consist of three parts: the body, the underglaze layer, and the glaze layer. The water absorption rate of the body is generally around 10-18%. The weight of the underglaze is 40-60 grams, while the glaze is 90-160 grams. In general, the higher the firing temperature, the greater the glaze weight, resulting in better brightness and a smoother surface of the tile. Of course, the quality of the glaze material also has a significant impact.

Inspection Standards: 1. For wall tiles, it is not permitted to have hollow spots in any area. Hollow spots are allowed at the edges of tiles, but the total number of hollow spots in a single room should not exceed three. You can use this standard to inspect the wall tiles in our indoor kitchen and bathroom.

2. The standard for verticality is that the tiles' facades must be within 3mm of vertical alignment; otherwise, they are not qualified.

3. The standard requirement for flatness is that the tile flatness error should not exceed 2mm. Additionally, the height difference between adjacent tiles should not exceed 0.5mm. Tiles exceeding the error are considered substandard, and we can request their removal and re-laying.

4. Tile grout alignment errors, whether horizontal or vertical, must not exceed 0.5mm. In fact, any error over 0.5mm is visible to the naked eye. Additionally, measure the tile grout's vertical and horizontal alignment before applying the sealant, as the sealant can conceal imperfections, making it difficult to measure later.