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Tensile strength
Tensile strength properties
ISO 1924-2 Determination of tensile properties based on constant elongation rate 20 mm/min and 180 mm clamping length. The method is intended for paper and cardboard and is the most common method.
ISO 1924-3 Determination of traction control characteristics based on constant extension rate 100 mm/min. This is a faster method compared to ISO 1924-2. It has a 100 mm clamping length. This method also includes tensile strength.
Paper qualities are sensitive to speed and the results from ISO 1924-2 and ISO 1924-3 cannot be compared.
Characteristics analyzed:
Tensile strength: Maximum tensile strength per unit width that can be sustained before failure. (Paper and cardboard)
Tensile index: Tensile strength divided by surface weight.
Elongation: Elongation of the test piece (mm).
Strain: The ratio of elongation of the test piece to the initial length of the test piece (%).
Elongation at break: The ratio of the elongation at break to the length of the initial test piece (%).
Work of breaking: The amount of energy per unit area during tension when the test strip has been pulled to the maximum.
Breakage index: Breakage divided by surface weight.
E-modulus: The maximum slope of the force-strain curve multiplied by the initial length, divided by the width and thickness of the test strip.
Preparatory work:
Before testing, sample handling takes place according to ISO 186 and conditioning according to ISO 187. Surface weight is measured according to ISO 536 and thickness, density and specific volume are measured according to ISO 534.
For tissue products, we refer to ISO 12625-4. For tensile strength testing on laboratory sheets, we refer to ISO 5270.
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