Polymer/clay aerogels, produced using an environmentally-friendly freeze drying process are low density (typically 0.05 – 0.2 g/cm3) materials which avoid the large quantities of chemical by-products, use of organic solvents, and expensive supercritical extraction steps associated with the more common aerogel processes. In addition to the absence of by-products, these aerogels can be produced from a wide variety of bio-based polymer feedstocks, and by simple manipulation of polymer loadings and ion contents, can span at least six orders of magnitude in compressive moduli. The flammability of these aerogels is surprisingly low, a radical departure from analogous polymer foams of similar bulk densities. The effects of aerogel composition and density on flammability properties will be discussed.