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What is Aerogel? Aerogel is made from Silicon Dioxide, the same material as ordinary glass, only 1,000 times less dense. Developed by NASA, Aerogel is the lightest and lowest-density solid known to exist. A truly remarkable material, Aerogel holds an unbelievable 15 entries in the Guinness Book of World Records, including best insulator and lowest density solid. Aerogel is composed of amorphous Silicon Dioxide, and 99.8% Air. Its melting point is 2,200 degrees F (1,200 degrees C).