Precipitated silica

About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.

Cerium-containing precipitated silica, process for producing same and masses, hardenable to elastomers, containing same

Abstract: Cerhaltige Fallungskieselsaure gekennzeichnet durch die folgenden physikalisch-chemischen Kenndaten: Cerium-containing precipitated silica characterized by the following physicochemical characteristics: Sie wird hergestellt. It is produced. indem man der Origmalfallungssuspension einer Fallungskieselsaure eine Cer(IV)-Salzlosung zufugt by adding the Origmalfallungssuspension a precipitated silica, a cerium (IV) salt solution Die mit der cerhaltigen Fallungskieselsaure hergestellten. The products produced with the cerium-containing precipitated silica. zu Elastomeren hartbaren Massen auf Basis von Diorganopolysiloxanen weisen ausgezeichnete Warmestabilitat auf. to give elastomers, curable compositions based on diorganopolysiloxanes have excellent heat stability. Zusatzlich wirkt die cerhaltige Fallungskieselsaure als Flammschutzmittel In addition, the cerium-containing precipitated silica acts as a flame retardant

Soft sealing material, especially for manufacturing high-duty packings for cylinder heads in internal-combustion engines

Abstract: An asbestos-free soft fibre web material in particular for impregnated cylinder head gaskets and exhaust flange seals in internal combustion engines which is based on mixtures of fibres of organic and inorganic, synthetic and/or natural origin, binders and mineral fillers preferably contains as a filler from 30 to 40% by weight of a mixture of pyrogenic silica with feldspar, precipitated silica and/or dolomite in a preferred mixing ratio of from 10:3 to 1:3. Compared with conventional materials, the soft material gives appreciably improved and more uniform impregnant uptake, and the seals produced combine optimum functioning characteristics with a high yield limit and durability.

Air filtration media comprising metal-doped precipitated silica materials

Abstract: The present invention relates generally to an environmental control unit for use in air handling systems that provides highly effective filtration of noxious gases (such as ammonia). Such a filtration system utilizes novel metal-doped precipitated silica materials to trap and remove such undesirable gases from an enclosed environment. Such silicas exhibit specific porosity requirements and density measurements. Furthermore, in order for proper metal doping to take effect, such precipitated silicas must be treated while in a wet state. The combination of these particular properties and metal dopant permits highly effective noxious gas filtration such that uptake and breakthrough results are attained, particularly in comparison with prior precipitated silica filtration products. Methods of using and specific filter apparatuses are also encompassed within this invention.

Dentifrices comprising biogenic silica materials and at least one calcium phosphate

Abstract: Unique dentifrices comprising unique abrasive biogenic silica materials are provided. Such compositions exhibit excellent abrasive characteristics, either alone, or in combination with other types of abrasives. In such combinations (with precipitated silica materials, as one example), simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels are possible in order to accord the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces, even at low levels of such biogenic silica additives. Such biogenic silica particles thus surprisingly accord beneficial properties within dentifrice compositions. Encompassed within this invention is the method of utilizing such biogenic silica products within dentifrices, either as the majority abrasive component, or in combination with any other type of commonly used abrasive material.