04/05/2026
Things they don’t like you knowing: A wall made of h**p was exposed to a flame of 650 °C (1200°F) for four hours without catching fire or yielding. On the reverse side, the temperature remained constant at just 2 °C.
This impressive result confirms what laboratory tests have also shown: h**pcrete is naturally fire-resistant.
In ASTM-E119 tests, h**p-lime walls withstood temperatures of up to 925 °C (1697° F) for one hour, while the unexposed side stayed close to room temperature.
Further studies demonstrate that h**p blocks maintain their structure even after prolonged exposure and do not ignite - lasting up to two hours under fire conditions. Thus, h**p in construction not only provides ecological benefits but also makes a decisive contribution to safety.
Sources:
H**pBuildMag. (2023). ASTM E119 Americhanvre Fire Test. H**pBuild Magazine.
ScienceDirect. (2023). Fire behavior of h**p blocks:
A biomass-based construction material. Construction and Building Materials.
**pCrete