Final answer:
The type of aircraft soundproofing material with heat sealed edges is the intumescent epoxy material, which expands when exposed to heat. It was developed for the Apollo heat shield and has since been used in various applications.
Step-by-step explanation:
The type of aircraft soundproofing material that has heat sealed edges is the intumescent epoxy material. This material expands in volume when exposed to heat or flames, acting as an insulating barrier and dissipating heat through burn-off. It was originally developed as a heat shield for the Apollo spacecraft and has since been used in various applications, including aircraft soundproofing.