Abstract
Factors which may influence the flexural strength of asbestos-reinforced phenolic composites were investigated. These are: fibre-to-resin adhesion, the degree of fibre dispersion, the relative fracture strains of the fibres and matrices, and voids. Fibre-to-resin adhesion was promoted by pre-coating asbestos fibres with phenol-formaldehyde in solution state throughin situ polymerization. Fibre dispersion was controlled by applying shear agitation to the mixture of fibres in solution duringin situ polymerization. The ratio of the fracture strain of the fibres to that of the matrix was varied by using resins having different fracture strains. Voids were found to be present in all cases. The size of voids was not significantly affected by different processing conditions.
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