GB/T 12829 - 2006 specifies the method for determining the Tear strength of vulcanized rubber or thermal plasticity rubber samples (Delft samples). The standard specifies the applicable rubber types, elaborates the prepative requirements for Delft samples, and specifies the specifications of instruments and equipment such as Tensile machines. Specifies the tearing test operation process, including tensile speed control, data recording, etc., and also explains the calculation and representation of the results. Tear strength is an important indicator to measure the performance of rubber materials. This standard provides a unified method for mass testing of rubber products, helps enterprises control product mass, and promotes the standardization development of the rubber industry.