Bulk And Tapped Density

Question 1

What do bulk and tapped density help understand powders?

Answer 1

Assess the flowability

Question 2

Bulk density

Answer 2

The volume of the powder has not been affected by external forces or conditions. Accounting for void areas.

Question 3

Tapped density

Answer 3

• Is the bulk density of a powder after it has been tapped.
• void will be rid of
• Tapping helps to simulate the compaction that occurs during transportation or handling of powders.
• tap until volume doesn’t change anymore

Question 4

How do you calculate density and in what units?

Answer 4

D=M/V (mass/volume)
Units: g/ml

Question 5

Carr’s Index

Answer 5

Is a parameter used to assess the flowability of a powder and is calculated based on both density and tap density measurements

Question 6

How do you calculate carr’s index? 

Answer 6

(Ptapped - Pbulk)/(Ptapped) * 100
Gives percentage

Question 7

Lower Carr’s index indicates

Answer 7

Better flow properties, meaning the powder can easily move and fill containers

Question 8

Higher Carr’s index indicates

Answer 8

Poor flow properties, which may result in issues like arching or bridging during manufacturing 

Question 9

Hausner ratio

Answer 9

Another parameter, like Carr’s index, that assesses flowability

Question 10

Tapped powder has _________ density

Answer 10

Higher density

Question 11

Untapped powder has _________ density

Answer 11

Lower density

Question 12

The higher the bulk density, the ________ the % pore space

Answer 12

Lower

Question 13

What instrument do you use for bulk and tapped density?

Answer 13

Sotax TD1 (and also need VBSE hood)