products and methods relating to composite materials and their use in coiled tubing is disclosed . the composite tubing is a pressurized means of conveying fluids downhole in a wellbore . it includes a multilayered laminate that resists buckling within the wellbore and is fabricated into a hollow tube . the fibers are oriented in angular relationship to the longitudinal direction of the coiled tubing such as to provide appropriate strength and buckling characteristics to the coiled tubing . further , the coiled tubing layered laminate may transmit signals representing data from downhole to the surface . in some embodiments , a composite disconnecting device which includes a blend of fibers of different types or orientations is shown . the disconnecting device shows a failure load range corresponding to the failure characteristics of the fiber blend , the fiber blend having a predetermined failure limit .