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Particle analysis

Tapped Density Analzyers

Autotap and Dual Autotap

Dual Autotap

Instrument appearance and colors subject to change.


The tapped density of powdered, granular of flakey material is highly dependent on the manner in which the particles are packed together. During tapping, particles gradually pack more efficiently, the powder volume decreases and the tapped density increases. (more) .

Under controlled conditions of tapping rate, tap force (ie drop) and cylinder diameter, this condition of maximum packing efficiency is highly reproducible. Tapped density measurement (sometimes referred to as tapped bulk density, or just tap density) is formalized in a number of international standards to which both Autotap models conform. If you need to ensure the same fixed number of taps for all analyses, a special lockout feature is provided which prevents unauthorized changes to the counter.

Tapped Density Standards

ASTM B527  
(metallic powders)
ASTM D4164  
(Formed Catalysts)
ASTM D4781  
(fine catalysts)
 IDF 134  
(dried milk)
 ISO 787-11  
 ISO 3953  
(metallic powders)
 ISO 8460  
(instant coffee)
 ISO 8967  
(dried milk)
 ISO 9161  
(uranium dioxide powder)
JIS K5101-12-2  
 JIS Z 2512  
(metallic powders)
MPIF 46  
(metal powders)
USP<616>Method II   (preharmonization)  
(pharmaceutical powders)
USP<616> Method I (harmonized)  
(pharmaceutical powders)
JP 3.01 Part 2 Method I  
(pharmaceutical powders)
PH. Eur. 6.8 Method I (harmonized)  
(pharmaceutical powders)

Available Options

The Autotaps are normally supplied with 250ml cylinders, but you may request 10ml, 25ml, 50ml, 100ml or 500ml instead.  A larger optional platform is required to accommodate the largest cylinder we offer, the 1000ml.  But, of course, this platform does accommodate all the smaller cylinders too. more

Customer Testimonial
"...noticed immediately upon switching instruments how quickly and easily placing and removing the cylinder was in comparison to the other machine,..." : DiaPac LLC more...


Noise Reduction Cabinet

Noise Reduction Cabinet

A sound-insulated enclosure is available that accommodates either Autotap models. The noise from tapping can be reduced by up to 15 dBA (actual improvement depends on local factors such as bench material and ceiling height).