HH-I-561E, FEDERAL SPECIFICATION: INSULATION BLOCK AND SLEEVING, THERMAL (ASBESTOS-FOR TEMPERATURES UP TO 1200 DEG. (24 MAY 1967) [NO S/S DOCUMENT]

HH-I-561E, FEDERAL SPECIFICATION: INSULATION BLOCK AND SLEEVING, THERMAL (ASBESTOS-FOR TEMPERATURES UP TO 1200 DEG. (24 MAY 1967) [NO S/S DOCUMENT]., This specification covers asbestos block and pipe covering insulation for use on surfaces operating at temperature up to 1200 degrees F.