1. As a wood fire retardant, sodium silicate makes full use of its non-flammable and non-explosive physical properties, and sodium silicate itself will not burn. However, coating sodium silicate on the surface of wood will block the direct contact between wood and oxygen in the air, so that even if wood is burned, it will only turn black at most, and if it is at high temperature, it will only dry distillation, so sodium silicate can be used as a wood fire retardant.
2. The water glass solution can penetrate into the cracks and pores after brushing or impregnating the material, and the solidified silica gel can block the capillary channels, improve the density and strength of the material, thus improving the weathering resistance of the material. However, sodium silicate shall not be used to paint or impregnate gypsum products. Because sodium sulfate (Na2SO4) is generated by the reaction between sodium silicate and gypsum, it crystallizes and expands in the pores of the product, which leads to the cracking and damage of gypsum products.
3. The melting point is as high as 188℃.
to sum up, sodium silicate is a suitable material for wood fire retardant.
Extended information:
Other uses of sodium silicate:
(1) Brush the surface of the material to improve its weathering resistance with a density of 1.35g/cm? Soaking or brushing porous materials such as clay brick, cement concrete, silicate concrete and stone with sodium silicate can improve the compactness, strength, impermeability, frost resistance and water resistance of materials.
(2) Reinforcing the soil, sodium silicate and calcium chloride solution are alternately injected into the soil, and the generated silicic acid gel is in a swelling state due to absorbing water in the soil in a humid environment, so that the soil is consolidated.
(3) Prepare quick-setting waterproof agent.
(4) Repairing cracks in brick walls After mixing water glass, granulated blast furnace slag powder, sand and sodium fluorosilicate in a proper proportion, they are directly pressed into cracks in brick walls, which can play a role in bonding and reinforcing.
(5) Sodium silicate solution can be used as the external surface of fire doors.
(6) It can be used to make acid-resistant cement, which can be used for lining of furnaces and pits.
(7) preparing silica gel.
Baidu encyclopedia-sodium silicate