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Boron carbide/natural rubber latex (B4C/NRL)flexible films were prepared via dip-molding with B4C content in the range of 5-55 wt％ for thermal neutron (0.0253 eV) shielding.B4C was well dispersed in NRL according to microscopic observation.Both the inside and outside surfaces of the film were smooth.For B4C/NRL flexible films,the minimum elongation at break was greater than 600％,the minimum tensile strength was greater than 12 MPa,and the hardness was in the range of 35-55 HA,which were suitable for preparing flexible wearable products.The attenuation efficiencies of the B4C/NRL flexible films for thermal neutrons were also calculated.The B4C/NRL flexible films exhibit good attenuation effect for thermal neutrons.