Slip Ratings Explained: PTV and R Values (R9 to R13)

Choosing anti-slip flooring is much easier once you understand the two rating systems you will see quoted: Pendulum Test Values (PTV) and R ratings. They measure slip resistance in different ways, so it helps to know what each one tells you.

Pendulum Test Value (PTV)

The pendulum test is the British Standard method and the one the Health and Safety Executive prefers, because it can be used on site, wet or dry. The HSE guidance is:

• 0 to 24 PTV: high slip risk
• 25 to 35 PTV: moderate slip risk
• 36 PTV and above: low slip risk

A surface scoring 36 or more is considered to give roughly a one-in-a-million chance of slipping, which is why 36+ is the usual target for public areas in both wet and dry conditions.

R ratings (DIN 51130)

R ratings come from a German ramp test where an operator in oiled boots walks on a tilting surface. They run from R9 (least grip) to R13 (most grip). As a rough guide to the equivalent pendulum values:

• R9: around 11 to 18 PTV
• R10: around 18 to 34 PTV
• R11: around 34 to 54 PTV
• R12: around 51 to 70 PTV
• R13: 70+ PTV

The two systems are not directly interchangeable because they test differently, so treat any conversion as a guide rather than a precise match.

Which rating do I need?

For most internal commercial floors, aim for a PTV of 36 or more (broadly R11). Wet, greasy or external areas such as ramps, kitchens and walkways usually call for a coarser surface, often R12 or R13. When in doubt, choose more grip rather than less.

Reliable anti-slip products

All our GRP products are anti-slip by design. Browse GRP grating, anti-slip floor sheets and anti-slip decking strips, or contact us for slip ratings on a specific product.