Question

according to ip/bp very fine powder is one of which-
a. all particle pass through 120#sieve
b. all partcle pass through 150#sieve
c. 90% particle pass through 350# sieve
d.90% particle of size > 10um​

Answer 1

According to IP/BP very fine powder is one of which all particles move through 120#sieve (option a).

• The pharmaceutical powders are categorized based on their size and are referenced from whether it filters down from the particular class of sieve.
• Very fine powder includes all the pharmaceutical grades of substances that fall in a particular range as described by Indian Pharmacopoeia and British Pharmacopoeia.
• The 120# sieve here refers to the aperture or size of one mesh of the sieve. It has a nominal aperture size of 125 micrometers.
• Hence, very fine powders are pharmaceutical powders in which all the particles move down through a 120# sieve.