sentences:  This technology could be transferred and applied for the mass production of regular automobile parts (corrosion-resistant exhaust pipes and the like) as well as heat shields.A well-known motorcar manufacturer already developed a geopolymer-composite exhaust pipe system.Production of geopolymer cement requires an aluminosilicate precursor material such as metakaolin or fly ash, a user-friendly alkaline reagent (for example, sodium or potassium soluble silicates with a molar ratio MR SiO2