RMS Foundation
Bischmattstrasse 12
2544 Bettlach
Switzerland
Phone +41 32 644 2000
METHODS
Specific surface area of powders and porous solids
Determining the specific surface area of powders and solids is of great importance in various industries as it directly influences the reactivity, adsorption capacity and catalytic efficiency of the material. A larger specific surface area usually means more active sites for chemical reactions, which is important in areas such as pharmaceuticals, where the dissolution rate influences the effectiveness of drugs, or in catalysis, where the reaction rate depends on the available surface area. In addition, understanding the specific surface area helps with quality control and optimization of processing conditions in production, which improves the performance of the final product.
We determine the specific surface area using the 5-point BET method (Brunauer-Emmett-Teller) using nitrogen adsorption.
According to which standards do we test?
Whenever possible, we carry out our testing services in accordance with or based on these international standards:
- ISO 9277
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Which devices do we use?
- Micromeritics TriStar ll 3030 Plus Gas Adsorption Analyzer
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For which material tests do
do we use this method?
We mainly use the determination of the specific surface area for medically relevant powders such as calcium phosphate powder, e.g:
- Raw materials for hydraulic cements
- Calcium phosphate powder
- Calcium carbonate powder
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What you should know about this method?
What needs to be considered with this method and the samples?
We can test all powders and solids that meet the following sample specifications:
- Minimum 10 m² (e.g. 10 g of a powder with a specific surface area of 1 m²/g)
- Maximum particle size: 4 mm
- Samples must not be altered by sample preparation at 130°C
- Samples must not absorb the sample gas (N2).
What is the measuring range?
Our test method provides measured values from 0.5m2/g.
Are all tests carried out by RMS?
Yes, we can carry out all tests in our laboratories.
Are the analyses accredited?
Yes, the method is validated and accredited according to ISO/IEC 17025.
Who is your contact person?
Marc Bohner
Dr. h.c. Dr. Sc. Tech.
Head of Research & Knowledge Transfer
+41 32 644 2040