公开(公告)号：US3682828A

公开(公告)日：1972-08-08

申请号：US3682828D

申请日：1970-06-22

Applicant: DYNAMIT NOBEL AG

Inventor： KEDDEINIS HEINRICH ,  LENZ ARNOLD ,  BLEH OTTO ,  TERMIN ERICH

IPC: C04B35/03 ,  H01B3/00 ,  H01B3/02 ,  H05B3/18 ,  H01B3/10 ,  H01B7/00 ,  H05B3/60

CPC classification number: H05B3/18 ,  C04B35/03 ,  H01B3/006 ,  H01B3/025

Abstract: AN ELECTRICAL INSULATING MATERIAL CONSISTS ESSENTIALLY OF: (1) A SINTERED MAGNESIA OF AT LEAST 94 WEIGHT PERCENT PURITY, AND (2) 0.1 TO 7 WEIGHT PERCENT OF A SILICA GEL HAVING A SPECIFIC SURFACE AREA IN THE RANGE OF 50 TO 1100 M.2/G., AND A SIZE LESS THAN 370U, PREFERABLY LESS THAN 70U. THIS INSULATING MATERIAL IS PARTICULARLY USEFUL IN THE MANUFACTURE OF TUBULAR HEATING COILS AND INSULATORS.