What do you mean by coarse powder sieve?
What do you mean by coarse powder sieve?
A) Coarse Powder: A powder, all the particles of which pass through a sieve with nominal mesh aperture of 1.70 mm (Sieve No. 10 ) and not more than 40% pass through nominal mesh aperture of 355 µm (Sieve No. 44) is called a Coarse Powder.
What is the size of coarse powder?
mesh aperture of 1.7 mm (No. 10 sieve) and not more than 40.0 per cent through a sieve with nominal mesh aperture of 355 µm (No. 44 sieve) is called coarse powder.
What is the reason for using coarse powder?
This coarse powder had pockets of air between grains, allowing fire to travel through and ignite the entire charge quickly and uniformly. The high active surface area of nanopowders results in lowering sintering temperature relative to coarser powders.
What are the different grades of powder?
Powder Fineness (Types of Powder)
- Coarse powder.
- Moderately coarse powder.
- Moderately fine powder.
- Fine powder.
- Very fine powder.
- Microfine powder.
- Superfine powder.
- Sieves.
Which one is called as fine powder?
Fine powder (180):- A powder of which all the particles pass through a No. 180 sieve. Very fine powder (125):- A powder of which all the particles pass through a No. 125 sieve.
What is divided powder?
A divided powder or chart is a single dose of powdered medicines in one or more individual packages, such as cellophane, metallic foil, or paper. The patient does not participate in the measurement process of powder divided into smaller dosage units, which makes them a more accurate dosage form than bulk powder.
What are the grades of powder in pharmaceutical engineering?
Official Standard for Powder: IP (Indian Pharmacopoeia)
| S. No. | Grade of powder | Sieve through which 40% of the particles pass/ Nominal mesh aperture |
|---|---|---|
| 1 | Coarse powder | 44 /(355 µm) |
| 2 | Moderately coarse powder | 60/ (250 µm) |
| 3 | Moderately fine powder | 85/(180 µm) |
| 4 | Fine powder | Not specified |
Which one is coarse powder?
Answer: mesh aperture of 1.7 mm (No. 10 sieve) and not more than 40.0 per cent through a sieve with nominal mesh aperture of 355 µm (No. 44 sieve) is called coarse powder. …
What is the difference between powder and granules?
A powder has a smaller grain size and granular probably consists of bigger grains. So, your surface to volume ratio will be different. You will have different behaviour of adsorption or diffusion due to the presence of pores in granules (if the granules are porous).
What is powder and its types?
Types. Many manufactured goods come in powder form, such as flour, sugar, ground coffee, powdered milk, copy machine toner, gunpowder, cosmetic powders, and some pharmaceuticals. In nature, dust, fine sand and snow, volcanic ash, and the top layer of the lunar regolith are also examples.
What are the different types of powder in pharmacy?
Classification of powders
- Bulk powders. As bulk powders are non-potent and can be dosed accurately and safely with measuring devices such as teaspoons, cups, and insufflators, they are non-potent.
- Dusting powders.
- Douche powders.
- Insufflations.
- Powder sprays.
- Divided powders.
What is standard powder?
Standards for powders for pharmaceutical purposes are laid down principally in the Indian Pharmacopoeia which states, that the degree of coarseness or fineness of a powder is differentiated and expressed by the size of the mesh of the sieve through which the powder is able to pass.
