- Author
-
Moran, H. E., Jr.
- Title
- Permeability and Elutriation Methods for Determining the Specific Surface of Dry Chemical fire Extinguishing Powders. Final Report.
- Coporate
- Naval Research Laboratory, Washington, DC
- Report
-
NRL Report 6499
January 20, 1967
26 p.
- Distribution
- Available from National Technical Information Service
- Keywords
-
powders
|
dry chemicals
|
permeability
|
extinguishing
|
effectiveness
|
fire extinguishers
- Identifiers
- surface area; specific surface; air elutriation method; extinguishant
- Abstract
- Two methods of measuring the specific surface of powders were examined for their suitability in characterizing dry chemical fire extinguishing powders. The air permeability (Blaine) method gives a direct measure of the total surface of a powder sample. The air elutriation (Roller) method gives the distribution of particle diameters in a sample, from which the surface can be found by numerical or graphical integration. Measurements of the specific surface by the permeability method of powders ranging from approximately 2600 to 5900 cm 2/g were reproducible to within +1.5% when the test was carried out in a preferred manner.