The reaction below 100 degrees C of a dehydroxylated clay (metakaolinite : (Al2O3)(SiO2)(2)(H2O)(0.05)) suspended in an alkaline sodium silicate solution ((Na2O)(SiO2)(1.4)(H2O)(x)) leads to an amorphous glassy aluminosilicate, called in this work "low-temperature inorganic polymer glass" (LTIPG or IPG). The IPG material is amorphous according to X-ray diffraction (XRD). Its molecular structure is determined by solid state Al and Si magic angle spinning nuclear magnetic resonance (Al-27 and Si-29 MAS NMR) spectroscopy. The polymer consists of SiO4 and AlO4 tetrahedra randomly distributed, with the restriction that no Al-O-Al bonds occur. The Al/Na ratio equals one, the overall cross-link density is almost four, and only few Si-OH groups are present. The reaction stoichiometry is deduced from differential scanning calorimetry(DSC) and Al-27 and Si-29 MAS NMR. The inorganic polymer glass is formed by the low-temperature reaction of silicate and metakaolinite in a one to one ratio, according to the following overall reaction equation [GRAPHICS] with z about 0.4. Mechanical testing shows that the ultimate compressive strength of the inorganic polymer glass corresponds with the stoichiometric silicate/metakaolinite one to one mixing ratio.