The single fibre tensile strength was measured in zero-span experiments on never-dried dewatered pulp pads (unrefined pulp). The analysis of fibres morphological characteristics like fibre length, width, coarseness, curl, kink, flexibility, fines etc. analysis of fibres was performed on a MorFi® analyser (TECHPAP, Grenoble, France). 40 mg (air-dry basis) of the pulp sample is dispersed in 1 L tap water within a 1.5 L Erlenmeyer until suspension is clear (no visible flocculation). The sample is then poured in a 1 L plastic beaker of the MorFi device. Measurements were carried out in triplicates. More information about the use of MorFi is described by .