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Determination of water repellency, resistance to wetting (in term of water absorb) and resistance to penetration (in term of water penetrated) of fabric done by an instrument known as bundasmann type apparatus.

The bundasmann type apparatus made of four specimen holders which hold four specimens of the fabrics under test the specimen holders are rotate at the fixed RPM by means of a worm reduction gear box and an electric motor. The four specimen holders are mounted on teh assembly so that the specimens are titled at specified angle to the horizontal. Each sample holder is provided with four wiper arms fixed at right angle to each other and rotating about the axis of the cup. There are two aluminum tanks one at the bottom where the sample holder assembly is fixed and the other is fitted at the tp of the instrument, where the brass jets are fitted.