General Quality
- Bricks shall be free from cracks and flaws and nodules of free lime.
- Bricks shall have smooth rectangular faces with sharp corners
- Bricks shall be of uniform in colour and texture.
- The area of perforation shall be in between 30% to 45% of the total area of the corresponding face of the bricks.
- The shorter side of the perforation shall be less than 20 mm in case of rectangular perforations and less than 25 mm diameter in case of circular perforations.
- Area of each perforation shall not exceed 500 mm2.
- Thickness of any shell shall not be less than 15 mm and that of any web not less than 10 mm.
Dimensional Specification
|
Brick Type |
Length (L), mm |
Width (W), mm |
Height (H), mm |
|
Modular |
190 |
90 |
90 |
|
Non-Modular |
230 |
110 |
70 |
Physical Requirements
| Compressive Strength |
Average compressive strength shall not be less than 7 N/mm2 on net area. |
| Water Absorption |
Shall not be more than 20% by weight |
| Efflorescence |
Shall have a rating of efflorescence not more than ‘slight’ |
| Warpage |
Average warpage shall not exceed 3% |