GB/T 13835.5-2009 "Rabbit hair fiber test method, Part 5: single fiber breaking strength and breaking elongation" standard specifies the method of determining the rabbit hair single fiber breaking strength and breaking elongation. Suitable for fine and coarse hair rabbit hair fibers. Through the isokinetic elongation test, record the maximum tensile force and elongation of a single fiber at breaking to calculate the breaking strength and breaking elongation. The standard includes the sample pretreatment, test conditions, instrument requirements and data processing. The experiment should be carried out under the specified environment conditions, and the results need to report the mean value, standard deviation and coefficient of variation, etc.