Find this a bit strange.......

[Old Mod]

So it has nothing to do with the quality of the tiles, just you might slip on your arse if you're a clumsy prat...??

Yep that’s it Andy.

@3_fall - great bit of information.
Thank you.

Thank you John,
PTV tests are considered far more accurate, reason being the ramp test means exactly that.
A test subject is made to walk on a tiled board with bare feet and a soap contaminate and the R value is determined by the point at which the test subject slips as the board is raised at one end creating a ramp.
The other method the test subject wears work boots and the board is contaminated by motor oil.

Each method conforms to a different DIN standard.

DIN standards are a European thing from Germany.

 

[Tile Shop]

UKSRG have recently done comparisons to compare PTV and R ratings and found that the R ratings are very sporadic. Seen several cases of R9's (RAK Lounge Matt) being more anti-slip than a few R11's because of its micro-texture. If a slip case ever goes to court, R's are thrown out as being unreliable, and the HSE's recommended test results are used, which is the PTV.

We're in the slow process of phasing out R ratings as they are only reliable if someone is tiling a ramp that is likely to be covered in oil! We've even had to send a 1000 sqm order of 20mm external porcelain back to a factory as it wasn't suitable for external use, lol. Claimed it was R11 but only scored 18 in wet conditions (See 3_fall's table)..... in comparison, the Lounge scored 50.

 

[Old Mod]

UKSRG have recently done comparisons to compare PTV and R ratings and found that the R ratings are very sporadic. Seen several cases of R9's (RAK Lounge Matt) being more anti-slip than a few R11's because of its micro-texture. If a slip case ever goes to court, R's are thrown out as being unreliable, and the HSE's recommended test results are used, which is the PTV.

We're in the slow process of phasing out R ratings as they are only reliable if someone is tiling a ramp that is likely to be covered in oil! We've even had to send a 1000 sqm order of 20mm external porcelain back to a factory as it wasn't suitable for external use, lol. Claimed it was R11 but only scored 18 in wet conditions (See 3_fall's table)..... in comparison, the Lounge scored 50.

I did wonder if you wrote the article Paul.