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The sodium silicate, however, is the high-temperature adhesive; the kaolin serves simply as a compatible high-temperature coloring agent. Some of these repair compounds also contain glass fibres to enhance their gap-filling abilities and reduce brittleness. Sodium silicate can be used to fill gaps in the head gasket of an engine.
Precipitated silica. Precipitated silica is an amorphous form of silica (silicon dioxide, SiO 2); it is a white, powdery material. Precipitated silica is produced by precipitation from a solution containing silicate salts. The three main classes of amorphous silica are pyrogenic silica, precipitated silica and silica gel.
Contents. Molecular sieve. Typical molecular sieves are of the LTA type. They feature sodium aluminosilicates cages (sodium not shown) that have high affinity for water. A molecular sieve is a material with pores (molecule-sized holes) of uniform size which link the interior of the solid to its exterior. These materials embody the molecular ...
Sodium metasilicate is the chemical substance with formula Na. 2SiO. 3, which is the main component of commercial sodium silicate solutions. It is an ionic compound consisting of sodium cations Na+. and the polymeric metasilicate anions [– SiO2−. 3 –] n. It is a colorless crystalline hygroscopic and deliquescent solid, soluble in water ...
The subunits of colloidal silica particles are typically in the range of 1 to 5 nm. Whether or not these subunits are joined depends on the conditions of polymerization. Initial acidification of a water-glass (sodium silicate) solution yields Si(OH) 4. If the pH is reduced below 7 or if salt is added, then the units tend to fuse together in chains.
Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10 −6 K −1 at 20 °C), making them more resistant to thermal shock than any other common glass. Such glass is subjected to less thermal ...
Appearance. hide. A geopolymer is an inorganic, typically ceramic -like material that forms covalently bonded, non-crystalline (amorphous) networks. Many geopolymers may also be classified as alkali-activated cements or acid-activated binders. They are mainly produced by a chemical reaction between a chemically reactive aluminosilicate powder e ...
Vermiculite is a 2:1 clay, meaning it has two tetrahedral sheets for every one octahedral sheet. It is a limited-expansion clay with a medium shrink–swell capacity. Vermiculite has a high cation-exchange capacity (CEC) at 100–150 meq /100 g. Vermiculite clays are weathered micas in which the potassium ions between the molecular sheets are ...