| Physical Properties Of Clay Face Bricks |
All clay facings are classified into one of the following three classifications to aid in the selection of the product which best suits the application.
FBX - Face Brick Extra
Durable face brick possessing the highest degree of size, shape and colour uniformity.
FBS - Face Brick Standard
These are clay face bricks that are durable,uniform in size and shape.
FBA - Face Brick Aesthetic
These are durable clay face bricks selected or produced for a highly individual aesthetic look derived from deliberate non-uniformity of shape and colour.
Work Size
Standard nominal work sizes are 222mm long x 106mm wide x 73mm high.
Efflorescence
Should range from nil to moderate, dependent upon the product.
Average Water Absorption
Depending on the product, will range from 5% to 15%. (24 hour soak test).
Initial Suction Rate
Facings generally fall in the range of 0,8kg/m2 min. to 2,0kg/m2 min., which is the optimum range to develop good brick mortar bonding.
Mass
The average mass of products will normally vary in the range of 2,3kg to 3,4kg per masonry unit.
BOS 28/ SABS 227 specification
| |
FBA |
FBS |
FBX |
Tolerance on Work sizes*
(1) Individual units
(2) Average dimensions (of 32 units)
|
No requirements
No requirements |
(L) (W) (H)
7mm 4mm 4mm
3,5mm 2mm 2mm
|
(L) (W) (H)
5mm 3mm 3mm
2,5mm 1,5mm 1,5mm |
| Warpage |
No requirements |
No individual unit to exceed 5mm warpage |
90% of the units to have
warpages of 3mm or less.
No unit to exceed 5mm warpage. |
| Efflorescence |
Not more than 50% of the samples to display more than slight efflorescence when tested in accordance with SABS 227/BOS28 |
Not more than 15% of the samples to display more than slight efflorescence when tested in accordance with SABS 227/BOS28 |
| Average Compressive Strengths |
Range from 17MPa to a practical upper limit of 70 MPa |
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