Fiber cement flat sheets emerge from a mix of inorganic hydraulic or calcium silicate binders, spurred by the chemical interplay of calcareous and siliceous materials, woven together with both organic and inorganic synthetic fibers.
Primarily designed for outdoor use, where exposure to elements like sun, rain, and snow is inevitable. These sheets may come coated or uncoated.
Tailored for indoor applications and outdoor use shielded from direct exposure to sun, rain, and snow.
Nominal lengths can extend up to 3000 mm, and nominal widths up to 1240 mm.
Usually available in thickness ranging from 3 to 9 mm, with preferred options being 3, 4, 4.5, 5, 6, and 9 mm.
6 mm: ±10%
Conducted under equilibrium and wet conditions, with minimum modulus of rupture values specified for different categories (External Sheet, Internal Sheet) as detailed in Table 1.
| Category | Modulus of Rupture, min (Mpa) |
|---|---|
| 1 | – |
| 2 | – |
| 3 | 7 (External), 10 (Internal) |
| 4 | 13 (External), 16 (Internal) |
| 5 | 18 (External), 2 (Internal) |
The mean modulus of rupture under wet conditions should not fall below 50% of the mean modulus under equilibrium conditions.
For the complete bending strength test procedure, refer to the article: “Acceptance Tests on Fiber Cement Flat Sheets– Part-1 of 2.”
Moisture traces may appear underneath during the test, but no water drops should form.
Procedure detailed in: “Acceptance Tests on Fiber Cement Flat Sheets– Part-1 of 2.”
After 50 freeze-thaw cycles, the average ratio (r) should not be less than 0.75.
Procedure detailed in the associated article.
Limit (L) should surpass 0.75.
Procedure detailed in the companion article.
Limit (L) should surpass 0.75.
Procedure detailed in the second part of the testing series.
Conducted on finished products; visible defects shouldn’t impact performance.
Procedure detailed in the corresponding article.