Asbestos ban


ASBESTOS FIBER

Fiber-cement asbestos based products had been widely used in the world due to their versatility as corrugated and flat roofing materials, cladding panels presented in large number of building and agriculture applications.


Following the worldwide tendency for replacing asbestos, manufactures started to look for new alternatives for fiber reinforcement which comply with Hatschek machines and provides good performance and high functional durability products. In addition to long term durability, compatibility to Portland cement matrix, process ability, availability and cost, alternative fibers for reinforcement must have high mechanical properties. High tenacity, high modulus and reduced elongation at rupture are considered key attributes.

PVA FIBER AS AN ALTERNATIVE

It is apparent that the long-term durability under hostile environments is required for a reinforcement material used in roofing. PVA fiber have been used as a reinforcement material of cement for more than 25 years because they have high alkaline resistance and high tensile strength. In fact, it was confirmed that the tensile strength of the fiber in cement sheet has kept their original levels after about 20 years outdoors exposure test. The change of tensile strength of the fiber with time is generally very small.

Testing of Kuralon (PVA filament yarn manufactured by Kuraray, JAPAN):
Yarn count and number of filament:    2000 dtex / 1000 filaments
Tensile strength :                                  196 N
Elongation at break :                            6.7%
Elastic modulus :                                  4060 N(26.4 GPa)
Loss on boiling for 30 minutes :          less than 1%

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