Wyzenbeek (Oscillatory Cylinder)

The ASTM D4157-07 is a test of the American Society of Testing and Materials. A Wyzenbeek
machine is used for this test allowing samples of the test fabric to be pulled tight in a frame
and held stationary. Individual test specimens cut from the warp and weft directions are then
rubbed back and forth using an ACT approved #10 cotton duck fabric as the abradant.

The end point is reached when two yarn breaks occur or when appreciable wear is reached or when
100,000 double rubs are reached. The samples should be checked every 5,000 double rubs,
and when an end point is reached because of failure, the rater should back up to the previous
5,000 double rub checkpoint as the test result of abrasion resistance. The test results are
therefore to be reported in 5,000 double rub increments.

Experience indicates that 100% olefin fabrics are best-tested using wire screen as
the abradant. The Wyzenbeek method tests flat abrasion resistance of a textile. This test method does not
evaluate edge abrasion or any of the other diverse factors that would determine the overall
durability of upholstery as used in variety of seating designs.

* For complete technical details about ASTM D4157-07: http://www.astm.org

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