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Analytical Test Methods

Analytical Test Methods
Key	Method	More Information
66x/x100	Determination of specific surface area (DIN ISO 9277) This test method describes the determination of the total specific external and internal surface area of disperse or porous solids by measuring the amount of physically adsorbed gas according to the method of Brunauer, Emmett and Teller (BET method). The resulting specific surface area is a multipoint BET value and is expressed in m²/g.	PDF
66x/x200 66x/x210	Determination of pH-value (DIN ISO 787-9) AEROSIL^® is a highly dispersed colloidal silica powder which is produced by a "high-temperature hydrolysis process" and thus has a very high grade of purity. The gaseous hydrogen chloride can be separated from the stream of Si0₂. The pH-value is a measure for the degree of deacidification of AEROSIL^® and indicates physical-, chemical- and application specific properties of hydrophilic and hydrophobic AEROSIL^® products. This method can be applied to hydrophilic and hydrophobic AEROXIDE^® products and Special Oxides as well.	PDF
66x/x300	Determination of Loss on drying (DIN ISO 787-2) The determination of the amount of moisture or volatile compounds adsorbed by the surface of pyrogenic oxides is obtained by drying the sample in an oven for two hours at 105°C.	PDF
66x/x400	Determination of Loss on ignition (DIN ISO 3262-20) The loss on ignition is determined at 1000°C at which the chemically bonded water as well as the physically bonded water is lost.	PDF
66x/x0420	Determination of Methanol wettability acc. to Corning glass Pyrogenic oxides which surfaces have been modified with non-hydrolyzable organic molecules, cannot be wetted by water. However, these hydrophobic dispersed silicas and other fumed oxides can be wetted using a Methanol/Water mixture. The content of Methanol in such mixture - in weight-% - is a measure for the degree of hydrophobicity and uniformity of treatment of the modified fumed oxide.	PDF
66x/x501	Determination of SiO₂-content (DIN ISO 3262-20) As the silicon dioxide content of AEROSIL^® is very high, the impurities need not be removed beforehand. To determine the SiO₂-content, the sample is treated with a sulphuric acid/ hydrofluoric acid mixture. Where samples are older than 10 days or for hydrophobic AEROSIL^® in general, the samples are ignited and weighed beforehand and then treated with the sulphuric acid/hydrofluoric acid mixture. As the generated silicon tetrafluoride is volatile, the SiO₂ content can be determined by the loss in weight.	PDF
66x/x701	Determination of Tamped density (DIN ISO 787-11) The tamped density of powders (often called tapped density) depends upon density, particle shape, and particle size. It allows conclusions to be drawn on e.g. the required size of packaging and the regularity of deliveries. The tamped density is equal to the ratio between the mass and the volume of a powder after it has been tamped in the Tapping volumeter under stipulated conditions. The tamped density is specified in g/cm³ in compliance with ISO 787-11. However, we specify the value in g/l due to the often low tamped density of synthetic pyrogenic oxides.	PDF
66x/x600	Determination of Carbon Content (DIN ISO 3262-20) The Carbon Content in fumed silica and fumed oxides is obtained by the oxidation of Carbon in a sample through combustion and the resulting CO2 measured by infrared (IR) detectors.	PDF

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