Should You Test with TRL or 4S Rubber?
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Wet pendulum results depend on one critical variable: the slider rubber. Under AS 4586–2013, you must choose either:
4S (Slider 96):
- General footwear simulation
- Used for most indoor and outdoor commercial settings
TRL (Slider 55):
- Softer compound, simulates bare feet or soft soles
- Used for ramps, pools, wet barefoot zones, and some external paths
Some surfaces test well under one but fail the other. For example:
- A P4 result with 4S may only be P2 with TRL
- A tile near a pool may need both ratings to satisfy NCC or HB 198-2014
Zerofal advises on the correct slider based on:
- NCC Table D2.14 or site-specific specs
- Intended installation zone
- Market expectations for use cases
Don’t guess - ask.
Zerofal will help you choose the correct slider and ensure your AS 4586–2013 test is valid for its application.
4S (Slider 96) simulates standard footwear for most commercial settings. TRL (Slider 55) simulates barefoot or soft soles and is used for ramps, pools, and wet barefoot areas.
Slip ratings can shift dramatically between sliders. A surface that passes with 4S may fail with TRL in barefoot zones.
TRL is required for wet barefoot areas like pools, showers, ramps, and some outdoor paths.
Yes. In some areas—like pool surrounds—both 4S and TRL tests may be needed for NCC or HB198 compliance.
Check NCC Table D2.14 or consult Zerofal. We advise on the correct slider based on standards, site use, and safety obligations.
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