U.S. Standard Sieve Number 



Passing Retained Qn Passing Retained On Passing Retained On 



10 20 30 40 50 70 



20 30 40 50 70 100 



10.0 120 



The cloth shall be affixed to a standard sieve having openings larger than 

 the coarsest sand used, in such a manner that no sand can pass between the 

 cloth and the sieve wall. The sand shall he oven dried. Shaking shall be 

 accomplished as described in EM 1110-2-1906, Appendix V, paragraph 2d(l)(g), 

 except shaking shall be continued for 20 minutes. Determine by sieving 

 (using successively coarser fractions) that fraction of sand of which 5 

 percent or less by weight passes the cloth; the equivalent opening size of 

 the cloth sample is the "retained on" U.S. Standard Sieve number of this 

 fraction. 



b. Corps of Engineers 1977 Guide Specification Method . Five unaged 

 fabric samples shall be tested. Obtain 50 grams of each of the following 

 fractions of standard glass beads: 



U.S. Standard Sieve Number 



Designated Designated 



EOS Passing Retained On EOS Passing Retained On 



20 18 20 70 60 70 



30 25 30 100 80 100 



40 35 40 120 100 120 



50 45 50 



Suitable glass beads can be obtained from: 



Cataphote Division 



Ferro Corporation 



P.O. Box 2369 



Jackson, Mississippi 39205 



Telephone: (601) 939-4631 



Within each size range, 98 percent of the beads should be within the 

 specified range. The fabric shall be affixed to a standard sieve 8 inches 

 in diameter having openings larger than the largest beads to be used in the 

 test. The fabric shall be attached to the sieve in such a manner that no 

 beads can pass between the fabric and the sieve wall. Shaking shall be 

 accomplished as described in paragraph 2d(l)(g), Appendix V, EM 1110-2- 

 1906, except the times for shaking shall be 20 minutes. Determine by 

 sieving (using successively coarser fractions) that size of beads of which 

 5 percent or less by weight passes through the fabric; the equivalent 

 opening size, EOS of the fabric sample is the "retained on" U.S. Standard 

 Sieve number of this fraction. 



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