Abstract
The paper presents the results of tests carried out to establish the effect of synthetic fibres added in varying amounts to fibre cement boards made with lignocellulose fibres using a wet process. The results are compared with those of boards made without plastic fibres. The data show that the type of synthetic fibre, its amount and the type of cellulose fibre all have significant influence on the properties of the boards. The addition of polyvinyl alcohol fibres to thermo mechanical pulps not only increased the bending strength but also showed adequate durability in accelerated tests. Fibre cement boards made at a pilot plant using flax fibres alone exhibited good properties. Surface microcracking observed during accelerated weather tests can be contained by protective coatings.
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