The apparent densities of powdered, granular of flaked materials are 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 tap density increases.
Under controlled conditions of tapping rate, tap force drop and cylinder diameter, this condition of maximum packing efficiency is highly reproducible. Tap density measurement is formalized in a number of international standards to which both Autotap models conform.
Standards Suitability_________
ASTM B527 |
(metallic powders) |
ASTM D4164 |
(Formed Catalysts) |
ASTM D4781 |
(fine catalysts) |
IDF 134 |
(dried milk) |
ISO 787-11 |
(pigments) |
ISO 3953 |
(metallic powders) |
ISO 8460 |
(instant coffee) |
ISO 8967 |
(dried milk) |
ISO 9161 |
(uranium dioxide powder) |
JIS K5101-12-2 |
(pigments) |
JIS Z 2512 |
(metallic powders) |
MPIF 46 |
(metal powders) |
USP<616>Part II |
(pharmaceutical powders) |
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Available Options
The Autotaps are normally supplied with 250ml cylinders, but you may request 10ml, 25ml, 50ml, 100ml or 50ml 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. If you need to ensure the same fixed number of taps for all analyses, an optional special lockout feature is also available which prevents unauthorized changes to the counter. (more)
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