What Does S2 Mean in Bricks?
In bricks, the S2 classification indicates a lower soluble salt content. This is a key rating used to assess the potential for efflorescence.
Bricks are tested for their soluble salt content, which is a significant factor in the formation of efflorescence. Efflorescence appears as a white, powdery deposit on the surface of masonry, caused by salts within the brick or mortar dissolving in water and then crystallizing on the surface as the water evaporates.
According to the provided reference:
"The categorised limits of this testing are S2 for lower salt content and S1 for higher."
S2 vs. S1 Salt Ratings
Brick salt content is typically categorized into two main levels:
- S1: Indicates a higher level of soluble salt content.
- S2: Indicates a lower level of soluble salt content.
Here's a simple comparison:
| Classification | Soluble Salt Content | Potential for Efflorescence |
|---|---|---|
| S1 | Higher | Higher |
| S2 | Lower | Lower |
Why Choose S2 Bricks?
Choosing bricks with an S2 rating offers a practical benefit, particularly in environments where efflorescence is a concern. As the reference states:
"Choosing bricks classified with S2 rating for soluble salt content can reduce the chance of efflorescence forming."
By using S2 rated bricks, you minimize the amount of salts available within the brick itself to migrate to the surface and cause unsightly deposits. While efflorescence can also be caused by salts in mortar or water, selecting S2 bricks addresses one significant source.
Selecting bricks with a low salt content rating like S2 is a proactive step in minimizing efflorescence and maintaining the aesthetic appearance of masonry over time.
