The Bundesmann water repellency tester is used to determine resistance to wetting and resistance to penetration by water of water repellent fabrics which are permeable to air.

In this test, four test specimens taken from the fabric under test are simultaneously exposed to a simulated heavy shower of controlled intensity while the lower surface of each specimen is subjected to a rubbing action. The increase in mass of the specimen during exposure to the shower is determined and any water passing through the fabric collected and its volume determined. 

Technical details