Acid-Resistant Bricks: Properties, Types, Tests, and Advantages

Acid-resistant bricks play a crucial role in protecting surfaces from the harmful effects of acids. These bricks are specially designed to withstand corrosive environments and are used in various applications such as chemical plants, pickling tanks, storage tanks, and sewer linings.

In this blog post, we will explore the properties, types, tests, and advantages of acid-resistant bricks.

Acid-Resistant Bricks Properties, Types, Tests, and Advantages

Properties of Acid-Resistant Bricks:

  1. Dimensions: Acid-resistant bricks come in standard dimensions of 230 x 114 x 64 mm. It is essential to adhere to the permissible tolerances to ensure consistency and quality.
  2. Finish: The finished acid-resistant brick should exhibit a fine-grained texture, density, and homogeneity. It should be free from flaws, defects, and deviations that may affect its performance and durability.

Types of Acid-Resistant Bricks:

  1. Class I Bricks: Class I acid-resistant bricks are recommended for severe corrosive conditions. They are commonly used in pickling tanks, storage tanks, and heavy-duty floors that are frequently exposed to corrosive liquids.
  2. Class II Bricks: Class II acid-resistant bricks are suitable for working areas and floors with occasional exposure to fumes, acids, and pith dry chemicals. These bricks are commonly used in fertilizer silos, skirting, and lining applications.

Tests for Acid-Resistant Bricks:

Several tests are conducted to assess the quality and suitability of acid-resistant bricks. These tests include:

  1. Water Absorption Test: This test determines the amount of water absorbed by the brick. Low water absorption is desirable as it indicates higher resistance to acid penetration.
  2. Flexural Strength Test: The flexural strength test measures the ability of the brick to withstand bending forces. A high flexural strength ensures durability and resistance to mechanical stress.
  3. Compressive Strength Test: The compressive strength test evaluates the brick’s ability to withstand crushing forces. It is essential for acid-resistant bricks to have high compressive strength to resist deformation and structural failure.
  4. Acid Resistance Test: The acid resistance test determines the brick’s resistance to acid attack. It involves subjecting the brick to a specific acid solution and measuring the weight loss. A lower weight loss indicates better acid resistance.

Advantages of Acid-Resistant Bricks:

  1. High Acid Resistance: Acid-resistant bricks exhibit excellent resistance to various acids, ensuring long-term protection for surfaces in corrosive environments.
  2. Low Water Absorption Rate: These bricks have low water absorption rates, reducing the chances of acid penetration and minimizing damage to underlying structures.
  3. Resistance to Oxidation: Acid-resistant bricks are not easily oxidized under room temperature conditions, enhancing their durability and longevity.
  4. Cost-Effective Solution: In situations where special metals and alloys are rendered uneconomical due to chemical attacks at high temperatures, acid-resistant bricks provide a cost-saving alternative.
  5. Compatibility with Less Expensive Alloys: By using acid-resistant brick liners, concentration and temperature levels can be lowered, making it feasible to utilize less expensive alloys, thereby reducing overall costs.


Acid-resistant bricks are indispensable in industries where protection against acid corrosion is paramount. Their unique properties, such as high acid resistance and low water absorption, make them an ideal choice for various applications.

By adhering to standard testing procedures and understanding the advantages of acid-resistant bricks, industries can ensure the longevity and safety of their structures in corrosive environments.

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