Understanding
Australian Slip Ratings
Understanding slip ratings is an important part of slip resistance testing in Australia, particularly when assessing compliance with the National Construction Code (NCC) and relevant Australian Standards. In residential buildings, slip-resistant surfaces are typically required only on stair nosings, landings, and ramps. However, in commercial and industrial environments, such as shopping centres, warehouses, and factories, slip resistance becomes significantly more important due to higher pedestrian traffic and operational conditions that increase the risk of slips and falls.
Factors such as walking speed, pedestrian movement patterns, and surface contamination from water, oil, or other substances can all influence slip resistance performance. These variables make accurate measurement essential when assessing floor safety in real-world conditions.
To evaluate new pedestrian surfaces, AS 4586:2013 and supporting guidance documents, including HB 197 and HB 198, are commonly used in slip resistance testing across Australia. These documents outline four primary test methods used to determine slip ratings, helping ensure surfaces meet safety requirements and comply with regulatory expectations.
This test involves a swinging pendulum arm with a spring-loaded rubber slider that moves across the test surface. The resistance measured during this interaction is recorded, resulting in a slip resistance value (SRV) classified into six levels from ‘P0’ (lowest slip resistance) to ‘P5’ (highest slip resistance).
This method uses a specialized machine equipped with a Slider 96 rubber slider to measure the Coefficient of Friction (CoF). The results are classified as ‘D1’ (CoF ≥ 0.4) or ‘D0’ (CoF < 0.4). While effective for quick assessments of dry surfaces, this test is not suitable for wet conditions. For surfaces that will remain wet, the wet pendulum test is preferred.
The Wet Barefoot Inclining Platform Slip Resistance Test
In this laboratory-based test, technicians walk barefoot on an inclined platform. The angle of the platform is gradually increased until a slip occurs. Results are categorized into four groups: ‘No Classification’, ‘A’, ‘B’, and ‘C’.
The Oil Wet Inclining Platform Slip Resistance Test
This test is similar to the previous one but involves standard-approved boots and oil. Technicians walk on an oiled surface while the incline increases until a slip happens. Results are classified from ‘No Classification’ to ‘R9’ to ‘R13’.
It’s important to note that these testing methods are independent and have different strengths and limitations. The Wet Pendulum test is often favored for its practicality, as it can be conducted both on-site and in the lab, making it more accessible than other laboratory tests.