Make up five samples of impregnated mop strings, as specified in preceding paragraph, except that they not need undergo the final 48 hours at 50oC. Fluff the mop strings by shaking; they should weigh20 to 30 g and be 6-7 cm long. Fasten them securely to the center of the lid of a 454 ml(1-pt) Mason jar or equal, so that about 3 cm of mop strings are hanging loose on either side of the fastening and place 20g of the synthetic soil in the Mason jar. Place the lid on the jar, and place jar and lid on shaking machine and shake at 450-500 oscillation per minute for 10 minutes.
At the end of 10 minutes, unscrew the lid, and weigh the mop strings.
The average weight of the five samples shall be taken/ and the average weight of retained soil shall be not less than 22 percent of the weight of the impregnated mop strings.
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