An easy sampling technique of wet-grinding has been devised to make KBr disks from insoluble crosslinked elastomers for transmission IR examinations. Satisfactory transmission IR spectra of some cured rubbers including that of high carbon black load obtained by using this method are reported. The fact that this sampling method can be applied to high resistant and tenacious rubbers suggests that transmission IR may directly be applied to most varieties of cured rubber and other tenacious polymers for their characterizations and chemical studies.