Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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Etching the inner surface of a restoration with Hydrofluoric acid(HF), followed by the application of a silane coupling agent, is a well-known and recommended method to increase bond strength, these two mechanisms are responsible for micro-mechanical attachment and chemical bonding, respectively.

Hydrofluoric acid selectively dissolves glassy or crystalline components of the ceramic and produces a more porous, rougher surface that facilitates the penetration of the resin into the microretentions of the etched ceramic surfaces. Such microretentions are considered to be crucial for the rheological interlocking of composite resin to ceramic. Furthermore, etching is generally followed by the application of a silane coupling agent. In addition to enhancing the wettability of the surface, the silane provides a chemical bond to the silica-based ceramic surface. Silane coupling agents are predominantly used as mediators, binding organic materials to inorganic ones. Being composed of bifunctional molecules, the silane will attach to both an organic resin and an inor-ganic material or substrate to achieve a “coupling” effect. The inorganic group of silane molecules hydrolyzes to produce silanol, which forms a metal hydroxide or siloxane bond with the inorganic material. The organic group of silane molecule reacts with the organic material to produce a covalent bond.  

Efficient solid acid catalyst are very important both for existing industrial production, or from environmental considerations. Especially for those using a liquid acid such as H2SO4, Hydrofluoric acid and AlCl3 as the process liquid acid catalyst. In recent years, taking into account both homogeneous and heterogeneous acid-catalyzed reactions play a decisive role in acid site (center) of the similarities between, according to the theory of modern homogeneous acid catalysis by different acid sites (L acid, B acid, super acid ) analysis of the nature of a strong acid catalyst presents a unified acid structure model. On this basis, a number of strong acid catalyst can be tailored.