Particle Size Distribution (Rotap) Test

Price of the test:

Up to 6 sieves: $62 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:

7-9 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