Back

Particle Size Distribution: Rotap

PDFdnwIcon Testing Service Catalog (PDF) Print Email

TECHNICAL DATA SHEET

Price of the test:

Up to 6 sieves:$60 per analysis

Acceptable Matrices:

Free-flowing powders and particulates

Unacceptable Matrices:

Liquids, particle sizes that are >25 mm


Limit of Detection:

A full range of sieves with openings from 0.037 to 25mm is available.


Sample Size Requirements:

100 grams


Equipment:

Rotap


Reportable Units:

% retained on each sieve


Turn Around Time:

10 Business Days


Is Rush Available?

Yes


Method Reference:

Internally Developed Method


Method Description:

Up to six sieves can be stacked on the Rotap in descending size order. The sample is placed on the top sieve and is sifted down via the shaking and tapping action of the instrument. Sample weights retained on the sieves are recorded. A full range of sieves with openings from 1 inch to 0.037 mm are available.


Information Required by Submitter:

We need to know the sieve sizes to be tested, either US Std. sieve numbers or particle size range to be covered (micrometers, millimeters, or inches). Use of flow agents or run times can be specified to meet method requirements.


Additional Information:

This method sizes particulate samples and powders by sieve separation. However, for sticky or high fat samples, the Alpine tester is more accurate.

Rotap Sieve Sizes
Sieve# Opening(")  Opening(µm)
1-inch  1.000   
3/4-inch  0.750   
 5/8-inch  0.625   
 1/2-inch  0.500  
 7/16-inch  0.438  
 3/8-inch  0.375  
 1/4-inch 0.250  
     
 #4  0.187  4750
 #5  0.157  4000
 #6  0.132  3350
 #7  0.111  2800
 #8  0.0937  2360
 #10  0.0787  2000
 #12  0.0661  1680
 #14  0.0555  1410
 #16  0.0469  1190
 #18  0.0394  1000
 #20  0.0331  840
 #25  0.0280  710
 #30  0.0232  590
 #35  0.0197  500
 #40  0.0165  420 
 #45  0.0138  350
 #50  0.0117  297
 #60  0.0098  250
 #70  0.0083  210
 #80  0.0070  177
 #100  0.0059  149
 #120  0.0049  120 
 #140  0.0041  105
 #170  0.0035   88
 #200  0.0029   74
 #230  0.0024  62
 #270  0.0021  53
 #325  0.0017  44
 #400  0.0014  37