Harbison-Walker Refractories Company has supplied high quality refractory materials to the oil refining industry since the 1940's. Harbison-Walker operates plants in the United States, UK, China and Indonesia and is the manufacturer of world leading refinery products such as KORUNDAL XD and GREENLITE 45-L GR. Register with Harbison-Walker to request HWR's renowned Handbook of Refractory Practice, information updates and special promotions A.P. Green, NARCO, and Harbison-Walker are part of the ANH Refractories family of companies