What are geopolymers?
Geopolymer Chemistry: an overview

The discovery of geopolymers stemmed from a desire to develop carbon-free, fire- and heat-resistant plastic materials. These are mineral materials, obtained by chemical geosynthesis processes, which do not burn and do not give off toxic gases or fumes. They are also low in CO₂ greenhouse gas emissions. What's more, like rocks and other geological materials, these mineral polymers are resistant to chemical attack, whether basic or acidic, as well as to organic solvents.