The honeycomb core structure used for attenuating loud noises is subjected to high temperature ( up to 315 C), and I am trying to figure out which method of manufacturing to use. I have not decided which material to use yet for protecting the honeycomb core structure from the high heat, but I would like to know whether Resin Infusion Molding (RIM) is better than Resin Transfer Molding? Independent of the material chosen, I want to know if RTM presents a low cost manufacturing solution?  What the advantages and disadvantages of RIM and RTM are? Is RIM more or less practical than RTM for a part of this nature (thermal protection system for the honey comb acoustic wall?  Is RIM complexity affected by the choice of material? Can either of these processes be used successfully with a honeycomb core (attenuator)? What are the challenges?