"INSULATION ENCLOSED BOTH SIDES W/STEEL,AMS 5510; STEEL STOCK 0.005 IN. MAX THK; INSULATION SANDWICH 0.250 IN. THK; OPERATING TEMP 1000.0 DEG F; THERMAL CONDUCTIVITY 0.22 AT 500.0 DEG F AND 0.27 AT 1000.0 DEG F; TWO BREATHER VENTS 0.190 DIA HOLES W/VENT SHIELDS"