- 22/01/2019 - CERTIFICATION ISO 14001
EDILFIBRO S.P.A. has recently obtained the certification for the Environmental ... more
- 08/01/2019 - FIGAN 2019 - ZARAGOZA - SPAIN
EDILFIBRO S.P.A. is going to participate to FIGAN 2019- ZARAGOZA, ... more
A modern material with significant properties and high quality performance.
The PVA in the fiber cement.
Resistant, durable, reliable and even environmentally friendly: fiber cement is one of the most advantageous solutions for the roofing of civil, industrial and agricultural buildings. The cement matrix reinforced with Poly Vinyl Alcohol (PVA) fibers results in a malleable product that meets modern construction requirements. In fact, the PVA fibers impart high resistance to tensile stresses, buckling and impact and ensure long product life. Like Edilfibro, all manufacturers in the EU use these reinforcing fibers because tests have proved them compliant with the current standards in force in Italy and Europe (UNI EN 494 for corrugated sheet; UNI EN 492 for flat sheet; UNI EN 10960 for reinforced fiber cement and finally UNI 10636 indicating the modes for installation of such sheet).
The positive features of fiber cement and PVA are not limited to mere compliance with the law.
This is one of the great assets of Edilfibro profiled sheets.
Light (13.5 kg/m2) and flexible, PVA CEMENT offers significant advantages for installation and maintenance thanks to the sturdiness and impact resistance
It is permeable to steam and helps ensure heat insulation. In particular, this material makes it possible to control condensation and drain off excess moisture.
It is resistant to the weather and chemicals such as sulphates and acid rain.
These products make the most of the remarkable sound-absorbent properties of PVA CEMENT.
This material does not oxidize and is not affected by microbial plants and animals (fungi, insects and rodents).
Round HATSCECK-type machinery
Given the fact that the cement matrix used in the fiber cement is rigid with low resistance to tensile stresses and low energy absorption, the presence of the PVA fibers compensates for this “drawback”: the tensile stresses are transferred from the matrix to the fibers. In this way, the item gains high resistance and malleability.
Fiber action mechanism.
Buckling behavior of matrix and composite, showing the great difference in the amount of energy absorbed.
The PVA fibers are hygroscopic and insoluble, they are resistant to chemicals in highly alkaline environments and for this reason are truly suited to use in cement pastes. The diameter of the filaments used to produce the fibers, 8-14 micron, is quite small and thus ensures that they are well distributed in the composite; the length, 6 mm, prevents them from being pulled out of the cement matrix when subject to stress.
After long periods of time in alkaline environments at high temperatures, PVA fibers have not shown any signs of decay but just an ever so slight decrease in their properties.
These are the main results of tests performed on the fibers drawn from items after up to 18 years of natural exposure and during tests running 200 alternating wet-dry cycles at temperatures of 60°.