[en] The measurement of crystallinity of thermoplastic natural rubber (TPNR) of NR:HDPE blends have been made at various compositions of liquid natural rubber (LNR) using x-ray and thermal analysis methods. The results show that the crystallinity of the blends increase significantly with the addition of LNR into the blends. The data indicates a good agreement between the two methods. The tensile properties, stress and strain of the blend improved significantly with addition of LNR. SEM micrographs of the samples also indicates an increase in homogeneity of the blends with addition of LNR. (Author)