More complex composition of silicate scale, the scale of silica (SiO2) content of up to 20%. Silicate scale, mostly gray-brown, there are gray, scale barbed surface, it is a very hard scale. Such scale easily in the highest parts of the boiler temperature Junction students, its main ingredient is not xonotlite mouth (2SiO2 * 2H2O). In the heat of this scale is difficult to dissolve in hydrochloric acid, slightly soluble after remaining debris such as sand, can be dissolved in hydrofluoric acid.
The main chemical components of CaO and SiO2 (SiO2≥20% -25%), in compound form with CaSiO3 (wollastonite) and 5CaO * 5SiO2 * H2O (zeolite) -based, MgSiO3 (forsterite) is also present in small amounts. This scale the hardest, thermal conductivity is also the worst. Usually in the boiler heating strongest parts (such as water wall, boiling furnace pipe) is formed.
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