Can anyone help

[a_lost_packet_]

When you contact companies/agencies, focus on what solutions they turned to when it was found that cork insulation used prior to WWII was undesirable due to its flammable nature.&nbsp; Pressed/formed fiberglass type composites would have likely made entry into military aviation also at that time and it's likely that similar materials would have continued to be in use.&nbsp; You refit an aircraft with critical new tech, new gizmos, new materials but, you don't always rip its skin off and replace insulation.&nbsp; That's not always a critical component and unless a tremendous weight savings would be found refitting an aircraft AND replacing the structural support the formed fiberglass composites provided would not be lightly undertaken.&nbsp; That's like rebuilding an entire aircraft plus you have to tool for the deconstruction as well.&nbsp; It'd be cheaper to build new ones.<br /> <div class="Discussion_UserSignature"> <font size="1">I put on my robe and wizard hat...</font> </div>