Skid Resistance of a Tile is the measurement of the degree of slippage of the particular tile.
Intaglio Ceramica identifies tile in the following three categories:
- Slip Resistant: Coefficient of friction is 0.60 or greater (wet). Meets or exceeds general safety and health regulations.
- Conditionally Slip Resistant: Coefficient of friction is 0.50 to 0.59 (wet). Meets or exceed general safety and health regulations.
- Questionable: Coefficient of friction less than 0.50
There are various ratings for tile friction. In these ratings motor oil is spread across the tiles until the person just starts to slip. These ratings are
- Rating R9 – Suitable for a less than 10° slope (minimal friction)
- Rating R10 – Suitable for a 10° to 19° slope (normal friction)
- Rating R11 – Suitable for a 19° to 27° slope (normal friction)
- Rating R12 – Suitable for a 27° to 35° slope (high friction)
- Rating R13 – Suitable for slopes more than 35° (very high friction)
This test uses a soap solution instead of motor oil and participants are barefoot:
- Rating A – Suitable for slopes 12° to 17°
- Rating B – Suitable for slopes 18° to 23°
- Rating C – Suitable for slopes >24°
There is also the Pendulum Skid Resistance Test, which gives the following ratings for tiles:
- Rating <25 – Very slippery
- Rating 26-35 – Average
- Rating 35-65 – Good skid resistance
- Rating 66+ – Excellent skid resistance
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