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

Inspection Standards: 1. For wall tiles, there should be no hollow spots on the surface. Hollow spots are permissible 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 perpendicularity is that the tile's face must be within 3mm of perpendicular. Otherwise, it is not qualified.

3. The standard requirement for flatness is that the tiles must not have an error of more than 2mm in flatness, and the height difference between adjacent tiles should not exceed 0.5mm. Tiles exceeding the error are considered不合格, and we can request their removal and re-laying.

4. Tile grout gaps must not exceed 0.5mm in either horizontal or vertical alignment. If over 0.5mm, it's visible to the naked eye. Additionally, measure the tile grout's horizontal and vertical alignment before applying the sealant, as the sealant can cover up discrepancies, making it difficult to measure later.