You must have heard that one tile is grade 1 and another is grade 2, 3 or 4. These grades indicate the quality, quality and flawlessness of the tile. Also, it is common to use tiles and ceramics from grade 1 to grade 4, and it is not like you think that grade 1 has more sales because of the high quality. To find out the type of grade and production date, just look at the box of tiles. Find out the tile grading, production date, permeability, etc. and make a better and more accurate choice in this way. The following contents will help you to understand the grades of ceramic tiles better and more accurately.

Grading method: After the tiles leave the furnace line and are transferred to the pallet, they are then transported to the grading department by a device such as TGV or LGV. The tiles are removed from the pallet by a schematic device and placed on the grading line. They become In general, the tiles are graded based on the appearance level, arch and size. The appearance level grading work is done by the operators.
There should not be more than one or two spots, with a maximum diameter of half a millimeter, at a distance of two centimeters from all the sides of their glazed surface.
Tiles that have only 2 or 3 spots with a maximum diameter of half a millimeter on their glazed surface.
Tiles that have only one unglazed on one of their 4 edges, with a maximum dimension of 10×3 mm. Tiles that have only two unglazed edges on the side of their glazed surface, with a maximum size of 2×5 mm.
Tiles that have only one edge in one of their four corners, with a maximum dimension of 3×5 mm.
Tiles that have only one edge in one of their corners, the maximum size of 2×2, and a spot on the glazed surface, the maximum diameter of half a millimeter.
On all the sides of their glazed surface, there should be only one unglazed spot, with a maximum size of 2×3 mm.
The operators grade the tiles based on the defects in the tiles, such as crack back glaze, welding, print quality, color, chipping, etc. In the grading part of the apparent surface, the operators determine its grade by means of magic on the tile.

After the surface part of the tiles, it reaches the arch part (Blanner). In this part, there are 5 sensors that are located along each other, and each sensor has two electronic eyes.

In this part, the sensors grade the tile according to the arc based on the information given to the device.

Convex tiles:

If the tile has 8.8% error (grade 1)

If the tile has 0.1% error (grade 2)

If the tile has 1.3% error (grade 3)

If the tile has 1.3% error (grade 4)

Concave tiles:

If there is a 5.5% error (grade 1)

If there is a 7.7% error (grade 2)

If there is a 9.9% error (grade 3)

After the tiles pass through this part, it reaches the calibration (sizer) part, where the tiles are graded in terms of size. In this part, the tile passes through the sensors, which are responsible for measuring the tiles of these sizes. The standard is measured based on a tile, this tile is called (model or sample), which is a normal tile, and the tiles on the line are compared with this tile.

After this part of the tile, they will reach two infrared sensors, which are responsible for the overall grading work of these two sensors.

Example: When the tile is grade 1 in appearance, it is grade 2 in terms of arch, and grade 3 in terms of size. These two sensors always choose the largest number, and this tile is grade 3 because it causes the least defects. May our grade be different.

After these sensors, the tiles reach the sorting section. In this section, there are 9 stickers (STAKER). In this part, the tiles are separated in different degrees, and then transfer the separated tiles to be made into cartons

How to understand the grading of ceramic tiles at a glance?
First class ceramic tiles
Tiles and ceramics are said to be completely healthy and without any defects on their glazed surface and sides.

Second grade tile
There are ceramics and tiles that have one of the following disadvantages in terms of appearance:

The cardboard of grade 4 tiles is usually white and it is written on the white cardboard that this product is not subject to the 25th standard of Iran. Grade 4 quality is usually a chance. Maybe 5 truckloads of 4th grade would be satisfactory, but the 6th truckload of waste tiles and ceramics would be unusable

Third grade tile
There are tiles that have only one spot on their glazed surface, with a maximum diameter of 3 mm.

Grade four tile

Grade 4 tiles and ceramics have the following characteristics:

Classification of export tiles
Export tiles are a mixture of first grade and second grade tiles.

Grading instead of grading
For some time now, to justify the low price of goods, it has been mentioned that the producer usually packs grades 1, 2, and 3 in grade B. Of course, grading is different in different factories. For example, one factory’s best product is grade A and another factory’s best product is grade C.