Technical Specification Powder Sulphur
Sieve and table of analyze (PHA.CO) Powder Sulphur
|
Mesh |
µm |
Fraction |
Wight |
Over size |
Cumulative over size |
Cumulative passing (%) |
|
35 mesh |
500 µm |
+35 |
1.44 |
2.54 |
2.54 |
97.46 |
|
40 mesh |
425µm |
+40-35 |
1.04 |
1.83 |
4.37 |
95.63 |
|
60 mesh |
225 µm |
+60-40 |
7.89 |
13.91 |
1828 |
81.72 |
|
80 mesh |
180 µm |
+80-60 |
9.20 |
22.09 |
34.50 |
85.50 |
|
100 mesh |
150µm |
+100-80 |
12.53 |
13.73 |
56.59 |
43.41 |
|
180 mesh |
80 µm |
+180-100 |
7.79 |
14.77 |
70.33 |
29.67 |
|
200 mesh |
75 µm |
+200-180 |
8.38 |
12.85 |
85.10 |
14.90 |
|
325 mesh |
44 µm |
+325-200 |
7.29 |
2.05 |
97.95 |
2.05 |
|
RESULT |
ITEM (B.S.METHOD) |
|
99.98 PCT MIN |
PURITY (ON DRY BASIS) WT |
|
0.08 PCT MAX |
ASH CONTENT WT |
|
0.09 PCT MAX |
HYDROCARBONS WT |
|
0.03 PCT MAX |
ACIDITY (AS H2SO4) WT |
|
0.09 PCT MAX |
MOISTURE WY |
|
YELLOW / BRITH YELLOW |
COLOUR |
|
COMMERCIALLY FREE FROM ARSENIC. SELENDIUM AND TELLURIUM |
|
SIZE MESH :
|
% Retained (Cumulative) |
|
|
40 mesh |
<=3% |
|
100 mesh |
<=3% |
|
150 mesh |
<=3% |
|
200 mesh |
<=3% |
|
250 mesh |
<=3% |
|
325 mesh |
<=3% |
Sieving or screening is a method of categorizing a powder’s particle size by running the powder through a specific sized screen. A powder can be separated into two or more size fractions by stacking the screens, thereby determining the powder’s particle size distribution. Sieves and screens are usually used for larger particle sized materials, greater than 44 micron (325 Mesh).
Two scales are used to classify particle sizes; US Sieve Series and Tyler Mesh Size. A powder’s mesh size can at times be somewhat confusing. A -6 mesh powder contains particles that pass through a 6 mesh screen. A -6 mesh powder has particles that measure less than 3360 microns. A powder that is -325 mesh has particles that measure less than 44 micron. As you can see, the larger the mesh number the smaller the particle size of the powder.
Different Mesh Sizes and Mesh to Micron Conversion : Pharmaceutical, Industry and Agriculture Guidelines sizes-used-in-pharmaceuticals, Industry and Agriculture and-its-conversion Different Mesh Sizes and Mesh to Micron Conversion Different types of wire mesh, their size and its conversion from mesh to micron and micron to mesh using simple formula.
Sieves and screens are widely used in the pharmaceutical manufacturing as well as in the quality control to determine the particle size of the raw materials. Mesh is the most common measurement unit used for the sieves and screens. Generally, 40 to 400 mesh sieves are used in pharmaceutical manufacturing during shifting and milling of raw material. Mesh is the number of openings in one linear inch of any sieve or screen. A 10 mesh sieve will have 10 openings and a 400 mesh sieve will have 400 openings in one linear inch.
The fineness of any sieve or screen depends upon the width of the wire used. The wire used in 10 mesh sieve will be thicker than the wire used in60mesh sieve. A thick wire can't make a fine sieve and a thin wire can't make a thick sieve. Fine sieves above 400 mesh, the particle size is described in microns. For a material having fine particles, a fine sieve having a very small opening is used. The fineness of any sieve or screen increases when its mesh size increases and its pore size decreases.
Following is the conversion table for the mesh to micron and inch. There is no official formula to convert the mesh to micron and vice-versa. I have tried to develop a conversion formula that gives approximately correct conversion from mesh to micron and vice versa.
Mesh x Micron =14900 (Approx)
Micron = 14900/mesh, and
Mesh = 14900/micron
It has some error but it is still useful to get an approximate value while convert between 50 to 400 mesh. This variation is shown in the table. Mesh and inches conversion can be done using the following formula.
Inch= 0.6/mesh
Mesh= 0.6/inch
Determination of Mesh Size of any Screen:
It is a very simple method to determine the mesh size of any sieve or screen. Carefully mark the sieve for 1 inch using a permanent marker and
Scale. Measurement should be started from the center of the wire to make it more accurate. Count the number the holes in this area. The number of holes in one linear inch is known as th
