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The five questions about tile water absorption, do you get it ?

- Jun 05, 2018 -

The water absorption rate of a tile refers to the ratio of the weight of the tile itself to the weight of the water after the suction, which reflects the adsorption and penetration ability of the tile. The water absorption rate is closely related to the strength of the tiles, and the water absorption rate is low, which indicates that the compactness of the tile is higher and the strength of the tiles is higher, and vice versa.

Water absorption is a key indicator of the quality of a tile, but it is not an absolute indicator. Pursuing a low water absorption rate may also cause problems. Different spaces have different requirements for water absorption, and the way of laying will be different.


1.Why the water absorption rate should not be too high?

In the quality sampling of ceramic tiles, water absorption is an important test index, which affects the properties of tile hardness, strength, and wear resistance to a large extent.
Within the standard range, the lower the water absorption rate, the higher the density of ceramic tiles, the better the hardness and strength of the product, and the higher inherent stability. If the water absorption rate is higher than the national standard, the ceramic tile absorbs too much water, and the quality defects such as discoloration, hollowing, falling off, and cracking easily occur after the tile is laid, thus causing consumer disputes.

2.The lower the water absorption, the better?

More and more consumers are concerned about the water absorption rate of tiles, and many manufacturers will also use low water absorption as a selling point. However, this does not mean that the lower the water absorption rate of all tiles, the better. On the contrary, some products and locations need a higher water absorption rate to ensure the quality of the paving.
In fact, ceramic tiles are still coated with cement mortar as the main binder. The way of laying is through the water contained in the cement slurry, which can be absorbed into the tile and solidified, thus forming the grip of the tiles on the wall. . Therefore, if the water absorption rate of the wall tiles is too low, they may miss one another, resulting in insufficient adhesion.


3.How much water absorption is acceptable?

According to the latest revised "ceramic tile" (GB/T 4100-2015) standard, ceramic tiles can be divided into:
Porcelain tiles (water absorption E ≤ 0.5%), tantalum tiles (water absorption 0.5% ≤ E ≤ 3%), enamel bricks (water absorption 6% ≤ E ≤ 10%), ceramic bricks (water absorption rate 10% the above).
It can be seen that there is no uniform water absorption standard for tiles. Different products have different standards depending on the applicable space. Generally speaking, the floor tiles are mostly porcelain or enamel. The national common standard is that 3% ≥ floor tiles have a water absorption rate of ≥0.5%. They are qualified; wall tiles are generally fine tannins, enamel bricks, or ceramic bricks. The national common standards are: 12% ≥ wall tile water absorption ≥ 3% is qualified.


4.Which space has sever  demanding on water absorption?

Bathrooms, showers, kitchens, balconies, etc., have high humidity, are easily dirty, and require frequent cleaning. Generally, it is recommended to select ceramic tiles with relatively low water absorption.

The toilet is in a wet state for a long time, and it is prone to water stains. If the water absorption rate of the tiles is too high, discoloration, mildew, empty drums, etc. may easily occur. Because the kitchen is affected by fumes, the tiles must be resistant to oil and scrub, as well as tiles with low water absorption.

When purchasing, you can check the instructions on the tile packaging to understand the product water absorption. A simple water absorption test can also be done by placing water droplets on the back of the ceramic tile and observing the diffusion of water. Faster diffusion bricks have higher water absorption, whereas water absorption is lower.


5.What should we watch out for when applying low water absorption tiles?

Before laying, ceramic tiles generally need to be treated with water soaking. If the water absorption rate is less than 0.5%, it will not affect the water before soaking. For ceramic tiles with low water absorption rate, you should choose to paste more strength materials. When laying porcelain tiles with low water absorption, tilelayers must know in advance the strength of pasting materials so as to avoid the situation caused by non-tile quality problems.

  • Bathroom Tiles 400x800mm
  • Bianco Carrara Floor Tiles
  • 900x1800mm/ 36x72'' Polished Tiles
  • 600x600mm/24x24'' Outdoor Tiles
  • 600x1200mm/24x48'' Fullbody Matte Floor Tile
  • High Gloss Floor Tile

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