Specific Surface Area
The total surface area per unit mass of a material, with the unit m²/g. The microstructural characteristics of ultrafine powder particles not only exhibit irregular surface shapes but often include pore structures. The size, shape, and quantity of pores significantly influence specific surface area measurements, making the determination of pore volume and pore size distribution a critical field in powder material characterization.
- Testing Methods: Nitrogen Adsorption Method, Mercury Intrusion Porosimetry
Instrument Technical Parameters
- Porosity: 3.5–5000 Å
- Pore Size: 2 nm–200 nm
- Specific Surface Area: 0.1–3500 m²/g
- Measurement Repeatability: ≤±3%
Sample Submission Requirements and Precautions
- Solid samples: 200–1000 mg in a plastic centrifuge tube.
- Samples must be free of water and low-molecular-weight organic compounds; otherwise, test results may be abnormal.
- Samples must be stable and non-decomposable at the pretreatment temperature.
Testing Example
Reference Standards
- ISO 9277:2010: Determination of the Specific Surface Area of Solids by Gas Adsorption – BET Method
- ISO 18757:2003: Fine Ceramics (Advanced Ceramics, Advanced Technical Ceramics) – Determination of Specific Surface Area of Ceramic Powders by BET Gas Adsorption Method
- GB/T 19587—2017: Determination of the Specific Surface Area of Solids by Gas Adsorption – BET Method
- GB/T 39713—2020: Test Method for Specific Surface Area of Fine Ceramic Powders – Gas Adsorption BET Method
- GB/T 13390—2008: Determination of Specific Surface Area of Metal Powders – Nitrogen Adsorption Method
- GB/T 6609.35—2009: *Methods for Chemical Analysis and Determination of Physical Properties of Alumina *
- GB/T 10322.8—2009: Iron Ores – Single-Point Determination of Specific Surface Area – Nitrogen Adsorption Method
- ASTM C1069—09(2022): Standard Test Method for Specific Surface Area of Alumina or Quartz by Nitrogen Adsorption
- ASTM D4222—20: Standard Test Method for Nitrogen Adsorption and Desorption Isotherms of Catalysts and Catalyst Carriers by Static Volume Measurement
- ASTM D6556—2017: Standard Test Method for Total and External Surface Area of Carbon Black by Nitrogen Adsorption
- ASTM D1993: Standard Test Method for Specific Surface Area of Precipitated Silica by Multipoint BET Nitrogen Adsorption
- ASTM D5604—96(2017): Standard Test Method for Specific Surface Area of Precipitated Silica by Single-Point BET Nitrogen Adsorption
