Mechanical properties of short fibre composites depend strongly on the fibre length. Therefore, in preparing short fibre composites, processing conditions are of great importance as they affect the final fibre length. In this study 50 mm glass fibres were used to prepare acrylonitrile butadiene rubber (NBR) phenolic-glass fibre composites by two-roll mill method. Fibre breakage during processing was studied and the fibre critical length was calculated. On the basis of the critical length, the usefulness of the two-roll mill method for preparing glass-NBR-phenolic composites with the specified formulation was assessed.
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