Abstract: A webbing useful for safety belts having an excellent impact energy absorption and a superior impact strength, comprises a webbing made by weaving warps and wefts, at least the warps consisting of polyester filaments which have an intrinsic viscosity of 0.7 or more, a birefringence of 0.08 to 0.15, a tensile strength of 4 g/denier or more, an ultimate elongation of from 50% to 80%, and an elongation value of 5% or less at a point A in a stress-strain curve of the filaments, which point A denotes an intersection point of an extension of a steeply sloped portion of the curve appearing at the initial stage of the elongation of the filaments with an extension of a substantially horizontal or gently sloped portion of the curve appearing at the middle stage of the elongation of the filaments.

Abstract: A tire cord fabric is provided, the weft of which is composed of thermally modified partially oriented polyester filaments overcoated with adhesive rubbery latex. The weft having a break elongation of at least 80%, a birefringence value of at least 0.03 and dry heat shrinkage of at most 5% at 150.degree. C. for 30 minutes. The fabric shows a superior dimensional stability during crazing process, eliminating undesirable displacement of the weft along the lengthwise of the warp. The wefts in the fabric are also able to expand without breakage during tire building step, enabling the warps to distribute evenly in a spaced relationship.