Method for preparing self lubricating, asbestos containing stuffing box packings

Claim 1

A METHOD OF PRODUCING A SELF-LUBRICATING PACKING, COMPRISING THE STEPS OF AGITATING BETWEEN 20 AND 60 PARTS OF FIBROUS ASBESTOS IN CONTACT WITH BETWEEN 5 AND 15 PARTS OF A FINELY DIVIDED SOLID ABRASIVE MATERIAL SO AS TO LOOSEN THE FIBERS OF SAID FIBROUS ASBESTOS AND INCREASE THE SURFACE CONTACT AREA THEREOF WHILE RETAINING ITS FIBROUS STRUCTURE; FORMING A MIXTURE OF THE THUS FIBERLOOSENED FIBROUS ASBESTOS, SAID FINELY DIVIDED SOLID ABRASIVE MATERIAL AND BETWEEN 30 AND 65 PARTS OF A DRY, FINELY DIVIDED SOLID MINERAL LUBRICATING MATERIAL, SAID FIBERLOOSENED FIBROUS ASBESTOS HOLDING SAID FINELY DIVIDED MINERAL LUBRICATING MATERIAL DUE TO THE LARGE CONTACT SURFACE AREA AND THE LOOSENING OF THE FIBERS OF SAID ASBESTOS BY SAID FINELY DIVIDED ABRASIVE MATERIAL; ADDING WATER GLASS TO SAID MIXTURE; AND MOLDING SAID WATER GLASS CONTAINING MIXTURE INTO SHAPED BODIES, WHEREBY A RESILIENT, SELFLUBRICATING PACKING, RESISTANT AGAINST TEMPERATURES UP TO 600* C. IS OBTAINED.