Any powder, when moved, is subjected to attrition phenomena, leading to undesirable fines formation. Measuring attrition resistance is therefore essential, in particular for powders used as catalysts in fluidized bed and slurry reactors.
ATTRI-AS/MFC is an instrument for measuring the attrition resistance of any type of powder. It is based on the air jet principle and strictly complies with the ASTM standard method ASTM D5757. However, it can also be used following different procedures. Typical powders to be measured are in the range of 10 – 180 micrometers.
A special stainless steel attrition tube stresses the powder by high-speed air jets, coming from precision-drilled sub-millimeter nozzles, providing an accelerated simulation of the attrition phenomenon occurring in reality during a period of months.
Glass-made Settling Chamber
Ahead of the attrition tube, a glass-made settling chamber allows to see the powder during treatment. Both the air pressure and the flow rate measurement instruments are located before the attrition tube.
Fines Collection Filter
Located on top of the glass settling chamber, the disposable filtering unit retains the finer dusts. The percentage loss of fines after a specified time of treatment gives measurement of the attrition resistance.
Mass Flow Controller (MFC)
Accurate measurement of the air flow, compliant with CE specifications and ASTM D5757.
Located ahead of the attrition tube, the air flow can be humidified through a water saturator.
The ASTM standard method ASTM D5757 has been primary designed for catalysts, but can also be effectively applied to other powdered materials in the 10- 180 micrometers size range. The standard amount of material to be tested is 50 grams and the standard air flow rate to be used is 600 l/h.
The official text describing the method can be found at www.astm.org
MaTec specialists are able to supply alternative testing procedures
- Excessive catalyst consumption in fluid bed reactors.
- Difficult catalyst filtration in slurry reactors.
- Loss of powder after pneumatic conveying (any type of powder).
Size (W x H x D)
450 x 1900 x 500 mm
Timer with Alarm
Powder Size Range
10 - 180 micrometers
Flow rate meter
Mass flow controller
110V/60Hz version available on request