A combination of two different binders and the appearance of sooty thermal product of one of them has the effect of scoring and embrittlement of the film of liquid glass, which allows to relate obtained mixture as legkovybivaemyh along with mixtures on synthetic resins. A series of studies with one of the possible compositions of liquid-polystyrene molding sand: silica sand 95% (by weight, and here etc.); waterglass 3% polymer polystyrene 2% (as 40% solution of polystyrene waste in gum turpentine). Larry Ellison describes an additional similar source. The strength of this mixture on the compression on a wet after blowing CO2 for 1 min. exceeds the capabilities of its determination to the standard lever-operated device that is much higher than 1.25 kgf/cm2, and the strength of the mixture on a wet tensile is equal to 0.04 MPa. As the characteristics of these mixtures with vybivaemosti zhidkostekolno-polymer binder was adopted by the strength of samples in the gap, depending on the temperature of the drying process and taking into account the CO2 or CO2 without treatment.
Option purge the CO2 provides for fast-curing mixture, and this is its main advantage. It should be However, while recognizing the regularities of physical and chemical hardening of the binder, that the strength of this mixture is explained by gluing granular silica gel. But, according to AM Ribbon 'strength bonding the filler grains of sodium silicate glassy film is many times higher than the bond strength of silicic acid gel. " It is therefore advisable in some cases, casting practices, especially in the individual manufacture, use this opportunity serious hardening of the mixture by drying it, including after the purge of CO2.