ANALYTICAL: BET surface area and porosity analysis - Tristar II Plus


The Tristar II Plus provides high-quality surface area and porosity measurements on solid materials by using the technique of gas adsorption. The TriStar II is a fully automated, three-station analyzer capable of increasing the speed and efficiency of quality control analyses, with the accuracy, resolution, and data reduction to meet most research needs. Note that this instrument does not quantify % porosity, a gas pycnometer is needed for such data.


  • surface area: minimum = 1 sq. meter, recommended = > 5 sq. meters*
  • pore size: minimum = 1.7 nanometers, recommended = 20-200 nanometers
  • pore volume: minimum = 4E-6 cubic centimeters per gram, recommended = 2E-5 cubic centimeters per gram

*Although 5 sq. meters is recommended, usable results have been obtained with as little as 0.2 sq. meters of material by the manufacturer and as little as 0.1 sq. meters by an ASU customer.

  • Surface area and porosity measurements on solids by gas adsorption
Documents and manuals
ASU Unit
Knowledge Enterprise
Service ASU rate Nonprofit/other academic rate Notes
Analysis $22.50/sample $61.50/sample  
Liquid nitrogen fill $22.50/fill $61.50/fill 3 samples per fill