Wet Pendulum Test
The Wet Pendulum Tester works by detecting the wet dynamic friction between the specimen and the slider of a pendulum swinging in a vertical plane to measure the friction properties of each specimen.
In the laboratory, portable equipment is used to classify the wet slip resistance of new flooring (pedestrian surfaces) materials. On-site, it is also used to evaluate the slip resistance of existing floors and pavings.
A spring-loaded foot at the end of a pendulum arm is coupled to a rubber slider (leg). The pendulum arm is let go, allowing it to swing so that the slider hits the wet pedestrian surface over a 126mm distance. Before each test, the device’s slider rubber surface must be conditioned. This is done with abrasive paper of grade P400.
The slip resistance is measured by the amount to which the pendulum fails to reach its release height on the overswing.
Four S rubber (Simulated Standard Shoe Sole) and TRL rubber (Transport Research Laboratory) are the two types of slider materials used. The Four S rubber is the most often utilised of the two.
The surface is tested by the appropriate standard standards once the device is ready for testing. The results are documented, and a certificate of slip resistance is produced.