There are five different test methods approved by ASNZS 4586 for measuring slip resistance. All provide relative measurements only and there is no direct correlation between test results except to say that generally more slip resistant surfaces will score generally higher ratings across most tests. The most basic test is the Tortus or floor friction tester. As this test is essentially only suitable for dry applications and does not respond to profiled surfaces, Metz generally do not deal with these results in our area of specialty tiles for slip resistant applications. Of the other four tests each has benefits and disadvantages as follows :

The Oil Ramp test is the most commonly used test for slip resistance due to its European origins. Expresses results as R ratings—lowest R9, through to R13 (highest). The main benefits are its widespread usage, while its major drawback is that test scores are obtained by using heavily profiled industrial work-boots—other types of shoes provide huge variations in test scores.

Wet Pendulum test results are carried out on a ‘portable’ testing machine that unlike the ramp test can be used on site. Also known as the BPN or British Pendulum Test the pendulum consists of a swinging foot (pendulum) that is released in the horizontal position and swings through an arc until the base of the foot contacts the tile. The amount of follow through after contact with the tile is measured—the less the foot follows through the greater the slip resistance of the tile.

Wet Barefoot slip resistance testing is used for applications where it is expected that the majority of users will be in barefeet. This test is carried out on the same ramp apparatus as the oil ramp test except the tile panel is coated with water (not oil) and with the test operator not wearing any shoes. More profiled tiles generally score well as the human foot responds well to these.

The surface profile V test (Volume displacement) measures the amount of profile on the surface (peaks & troughs) of a tile and classifies it as V4, V6, V8 or V10 maximum. Tiles that achieve a particular V rating are felt to be of benefit for certain applications, such as where solid contaminants may be dropped onto the floor (items such as meat, fish, fruit or vegetables may be squashed below the raised profiles of surface.)