Material Properties TENSILE STRENGTH The tensile strength of the plasticcoated fabric is determined by the properties of the basefabric ie the strength of the yarn and its elongation properties A 1 inch wide strip of material is pulled apart in a tensile testing machine until it fails whereupon the rupture force and elongation are read of f at the point at which the rupture occurred This test is conducted in the longitudinal warp and transverse weft direction TEAR STRENGTH The normal method of identifying the tear strength of a material involves taking a sample making a 5cm long slit and inserting it in the two clamps of a tensile testing machine SIS 25 12 31 The tear force that is required to reinitiate the tear is read of f T ests conducted in this manner often gives dif ferent values for tear strength in the longitudinal and transverse axis of the woven fabric Experience has shown that the elasticity of the yarn hardness of the coating and weave ef fect tear strength Elastic fabric with a coating that permits a limited amount of thread slip typically basketweave normally has the highest tear strength Tensile Tear ROCVENT INC MINE TUNNEL VENTILATION 10 wwwrocventcom