Standard Conditions of Test
Reference: ASTM D751-19- Standard Test Methods for Coated Fabrics.
Physical tests may be made under prevailing atmospheric conditions except in the settlement of disputes. Unless otherwise specified, tests shall then be made upon material in standard conditions, i.e., the condition reached when the material is in moisture equilibrium with an atmosphere having a relative humidity of 65% and temperature of 70ยฐF (21ยฐC). A tolerance of +/- 2% is permitted in relative humidity and +/- 2ยฐF (1ยฐC) in temperature. Material shall be considered to be in equilibrium when it shows no progressive change in weight after free exposure to moving air.
Because of the labor involved in determining whether equilibrium has been reached, it is customary to condition the material for a minimum period of 15 hours at the temperature and relative humidity previously mentioned.
Note: These conditions are standard and will be used unless the test method requires special environmental conditioning.
CFFA-1: Abrasion Resistance Test
a. Wyzenbeek Method
Purpose: To determine the abrasion resistance of chemical coated fabrics under service conditions
Reference: ASTM D4157 โ Standard Test Method for Abrasion Resistance of Textile Fabrics (Oscillatory Cylinder Method)
Apparatus: Oscillatory Cylinder Type
To determine abrasion resistance of chemical coated fabrics, one specimen of each sample approximately 2 x 8 inches (5 x 20 cm) in size shall be cut with the long dimension parallel to the machine direction and tested for resistance to abrasion, using the Wyzenbeek abrasion wear tester, operating under the following conditions:
Abradent: #10 Cotton Duck (certified to meet the requirements of ASTM D4157)*** #220 Grit Silicon Carbide Sheet, Stainless Steel Screen (Surface Screen 50 x 70 Mesh, Support Screen 14-18 Mesh) or Abradents as specified
Speed, Double Rubs/Hour = > 5000
Temperature of Room => 70 - 90F (21 - 32C)
On stretchable fabrics such as knit, masking tape shall be used to reinforce backing to prevent elongation.
*Available from www.wyzenbeek.com.
**CFFA TM 1 cites settings of 2 lbf pressure, and 6 lbf tension. More common settings of 3 lbf and 4 lbf respectively are acceptable as there is little statistical difference in the test results.
***Available from Testfabrics, P. O. Box 26, 415 Delaware Avenue, West Pittston, PA 18643, www.testfabrics.com.
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