A brick having a low thermal conductivity and used as a backing for the more dense refractory brick.
NSN 7035-01-027-2259
NSN 5910-01-037-2529
NSN 6145-00-059-5345
NSN 2925-00-247-6248
NSN 6240-01-126-9167
NSN 6145-01-526-1651
NSN 5998-01-046-3788
NSN 2925-01-372-9455
NSN 6685-01-146-5249
NSN 6240-01-506-2059
NSN 5925-00-081-1170
NSN 5905-01-591-1605