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Standard Test Method for Precipitated Silica-Surface Area by Multipoint BET Nitrogen Adsorption (Includes all amendments And changes 7/23/2018).
Automatische name übersetzung:
Standardtestverfahren für gefällte Kieselsäure-Oberfläche, die durch Multipoint BET Stickstoffadsorption
NORM herausgegeben am 1.11.2013
Bezeichnung normen: ASTM D1993-03(2013)e1
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.11.2013
SKU: NS-631923
Zahl der Seiten: 3
Gewicht ca.: 9 g (0.02 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
nitrogen adsorption surface area, precipitated hydrated silica, silicas, surface area,, ICS Number Code 71.060.20 (Oxides)
Significance and Use | ||||||||
3.1 This test method is used to measure the surface area of precipitated, hydrated silicas that is available to the nitrogen molecule using the multipoint (B. E. T.) method. 3.2 Solids adsorb nitrogen and, under specific conditions, the adsorbed molecules approach a monomolecular layer. The quantity in this hypothetical monomolecular layer is calculated using the BET equation. Combining this with the area occupied by the nitrogen molecule yields the total surface area of the solid. 3.3 This test method measures the estimated quantity of nitrogen in the monomolecular layer by adsorption at liquid nitrogen temperature and at several (at least five) partial pressures of nitrogen. 3.4 Before a surface area determination can be made it is necessary that the silica be stripped of any material which may already be adsorbed on the surface. The stripping of adsorbed foreign material eliminates two potential errors. The first error is associated with the weight of the foreign material. The second error is associated with the surface area that the foreign material occupies. |
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1. Scope | ||||||||
1.1 This test method covers a procedure which is used to measure the surface area of precipitated hydrated silicas by the conventional Brunauer, Emmett, and Teller (BET)1.2 This test method is used to determine the nitrogen surface area of precipitated silicas with specific surface areas in the range of 1 to 50 hm2/kg (10 to 500 m2/g). 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not
purport to address all of the safety concerns, if any, associated
with its use. It is the responsibility of the user of this standard
to establish appropriate safety and health practices and determine
the applicability of regulatory limitations prior to use.
Standard Practice for Carbon
Black—Sampling Packaged Shipments Standard Practice for Evaluating
Precision for Test Method Standards in the Rubber and Carbon Black
Manufacturing Industries Standard Test Method for Carbon
Black—Total and External Surface Area by Nitrogen Adsorption Standard Practice for Carbon
Black—Sampling Bulk Shipments |
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