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standard by International Organization for Standardization, 12/01/1988
This International Standard specifies a system of marking the working face of refractory bricks for use in rotary kilns.
The method is intended to provide a quick and easy way of checking that each brick has been installed with the taper in-the correct direction, and also to assist in brick identification for turning circles.
The sizes of the bricks are given in ISO 5417.