loop as appropriate roll compression is measured by compressing a roll under a 1500 g flat platen of a test apparatus sample rolls are conditioned and tested in an atmosphere of 23 0 u00b0 u00b1 1 0 u00b0 c 73 4 u00b0 u00b1 1 8 u00b0 f a suitable test apparatus with a movable 1500 g platen referred to as a height gauge is available from a raise the platen and position the roll to be tested on its side centered under the platen with the tail seal to the front of the gauge and the core parallel to the back of the gauge b slowly lower the platen until it rests on the roll c read the compressed roll diameter or sleeve height from the gauge pointer to the nearest 0 01 inch 0 254 mm d raise the platen and remove the roll e repeat for each roll or sleeve to be tested to calculate roll compression rc in percent the following formula is used rc u2062 u2062 100 u00d7 initial u2062 u2062 roll u2062 u2062 diameter compressed u2062 u2062 roll u2062 u2062 diameter initial u2062 u2062 roll u2062 u2062 diameter absorbency of the inventive products is measured with a simple absorbency tester the simple absorbency tester is a particularly useful apparatus for measuring the hydrophilicity and absorbency properties of a sample of tissue napkins or towel in this test a sample of tissue napkins or towel 2 0 inches in diameter is mounted between a top flat plastic cover and a bottom.