Which one do you use?
Find out which of the two has the broadest scientific coverage across subject area’s and is used most outside the core area of insulating materials that is engineering.
You have found a large hole in your spaceship as a result from the crash.
On the planet temperatures drop below -40 degrees Celsius and it rains fire at night. You can either go out into the planet to look for a cave to live in until you get rescued or search the ship for materials to plug the hole.
In the storage area you find rigid boards of
Perlite and boards made out of Aerogel.
Hint