AATCC 122 pdf free download

AATCC 122 pdf free download.Carpet Soiling: Service Soiling Method.
7. Arrangement and Rotation of Specimens
7.1 The requirements are related to tile dimensions and traffic pattern of the particular soiling area. Therefore, it is not possible to propose a procedure which will be universally applicable. Specimen rotation is necessary to achieve uniform soiling.
7.2 However, to illustrate the principies involved and to mccl the conditions of the most common situation, we propose to use tile case of the long, narrow corridor. In this illustrative case there are 24 specimens in the test and in such an area it is not usually feasible to use a greater width than 68.5 cm (27 in.). This would correspond to a 2 x 12 arrangement as shown in Table I. The numbers rcfir in this case to the various carpets (including control samples) and the letters refer to replicates so that specimen Ia is the first replicate of Carpet 1.
7.3 The procedure for moving and rotating the specimens shall be as follows:
7.3.1 For the first six days of the test move each adjacent set of specimens (Ia and 5b) two positions in a lengthwise direction.
7.3.2 After the sixth day and until the completion of the test, advance each set of specimens one position each day.
7.3.3 Each time the specimens are moved, rotate the individual specimens 900 in a clockwise direction.
7.3.4 Finally, and in addition to the above, move the lengthwise rows from left to right and vice versa with each successive rearrangement of the specimens.
8. Soiling Levels
8. 1 The standard levels of soiling must be predetermined prior to conducting the service soiling test. For general use of this test the soiling intervals may correspond to those required to obtain soiling levels of an arbitrarily selected carpet (control sample) exposed to give a light. medium and high degree of soil (see
13.2). Each laboratory should select and prepare control soiled samples consistent with the needs of the laboratory. If two or more laboratories are involved, identical control samples should be available for each laboratory.
8.2 Test and control specimens are removed from the test pattern at specified intervals corresponding to different degrees of soiling or exposure to soiling.
9. Specimen Removal at Predetermined Soiling Levels
9.1 Remove all the “a” specimens as the first group whenever the “a” control test specimen matches the soiled control sample (first soiling level). This is done regardless of the appearance of the “b” and “c” specimens at that time. A comparison within each set of “a,”“b” and “c” specimens is to be made, however, and recorded.
9.2 Remove the “b” and “c” specimens and control samples in a similar manner at the second and third soiling levels, respectively.
9.3 As each soiling level is reached, replace spaces left vacant by the removal of test and control specimens. Use portions of the bufThr carpet fbr this purpose.
9.4 Compare the control sample with the control soiled sample daily as soon as possible after vacuuming. Once the decision is made to remove a set of specimens, vacuum the set immediately before they are removed from the test area. Soiling continues with the specimens being advanced one position each day.
9.5 Records of the traffic count and the duration of the test may be maintained.AATCC 122 pdf download.