Published 2026-03-20 · Slip-Tests UK
What each standard actually is
The pendulum test (BS 7976 / BS EN 16165)
The pendulum test is the UK's preferred slip resistance method. An apparatus with a rubber slider swings against the floor and the deceleration is converted into a Pendulum Test Value (PTV) from 0 to 150. Higher means more slip resistant. The test is performed on-site with portable equipment or in a laboratory on samples.
The ramp test (DIN 51130)
DIN 51130 is a German standard for laboratory ramp testing. A technician wearing standard safety shoes walks up an oil-contaminated inclined platform holding a flooring sample. The angle at which the technician begins to slip determines the R-rating — R9 (lowest) through R13 (highest). The test is laboratory-only and uses a specific industrial contaminant.
The fundamental difference
The pendulum test measures slip resistance under defined conditions — wet, dry, slider type — at a specific location. It produces a numerical value with established thresholds and is traceable to specific real-world contamination scenarios.
The ramp test produces a single classification band (R9–R13) based on the angle at which a person walking on an oiled incline begins to slip. It is useful for categorising industrial flooring products sold into European markets but does not directly translate to UK compliance thresholds.
Which standard UK law and the HSE prefer
The HSE explicitly references the pendulum test (BS 7976 / BS EN 16165) in its guidance (HSG155). UK courts consistently give greater weight to pendulum test evidence. UKAS-accredited pendulum test reports are the practical gold standard for defending slip-and-fall personal injury claims in the UK.
R-ratings are not a UK regulatory requirement. They are a product classification commonly displayed on flooring datasheets, primarily because the products are manufactured to European standards that use the DIN ramp test as the reference method.
When R-ratings are useful
For specifiers comparing industrial flooring products — particularly for wash-down environments, food production, or commercial kitchens — R-ratings provide a useful high-level comparison. A resin floor rated R11 is more slip resistant than the same product rated R10, and substantially more than R9.
General UKSRG guidance suggests: R9 for general indoor use, R10 for moderate contamination, R11 for wet/contaminated commercial use, R12 for heavy contamination, R13 for severe contamination (e.g. food processing wet zones).
Why R-rating alone is not enough
Two problems with specifying by R-rating alone:
Test conditions differ from UK reality. DIN 51130 uses oil as the contaminant. Most UK commercial environments are contaminated by water, cleaning chemicals, food debris, grit, or organic matter. A product that performs well in oil may not perform equivalently in water.
R-rating does not translate to UKSRG PTV thresholds. R10 and R11 products can produce widely different PTV results when tested in-situ. Installation, grouting, sealing, wear, and cleaning regimes all influence installed PTV in ways the original R-rating cannot capture.
Which should you use?
For UK commercial specification and compliance — pendulum test (BS 7976 / BS EN 16165) with PTV values is the standard. Insurers, HSE enforcement, and UK courts all use PTV thresholds.
For manufacturer product selection and comparison — R-ratings provide a useful first filter when comparing flooring products, particularly for industrial applications. Use R-ratings to shortlist; use PTV to verify.
For verification of installed performance — only pendulum testing works. A product with an R11 rating tested in-situ may achieve PTV 22 (below the 25 "high slip potential" threshold) because of installation errors, grout effects, or cleaning residue. In-situ pendulum testing is the only way to know.
The practical workflow
For a new construction or refit project, the most robust approach is:
- Shortlist flooring products using R-ratings appropriate to the environment
- Obtain UKAS-accredited pendulum test certificates for the shortlisted products (laboratory testing)
- Verify installed performance post-installation with on-site pendulum testing
- Re-test annually to monitor PTV degradation over the floor's service life
This combination uses R-ratings where they are genuinely useful (product comparison) and pendulum testing where it is legally and practically authoritative (UK compliance and claims defence).