Discover how Pendulum Slip Testing measures real-world floor safety – and what your PTV score actually means.
The Pendulum Slip Test (also known as the British Pendulum Test) is the UK’s HSE-preferred method for measuring slip resistance under wet or dry conditions. It provides a precise Pendulum Test Value (PTV) that tells you whether a floor surface meets accepted safety standards.
Used in workplaces, public buildings, and legal investigations, it’s the only test recognised by HSE guidance, UK Slip Resistance Group (UKSRG), and BS 7976-2 / BS EN 16165.
Quick Answer: What is pendulum slip testing?Pendulum slip testing is an on-site floor safety test used to measure slip resistance. A calibrated pendulum tester swings a rubber slider across the floor surface to produce a Pendulum Test Value, or PTV. In the UK, a wet PTV of 36 or above is generally treated as low slip risk.
🔑 Key Takeaways
- Pendulum Slip Testing measures floor slip resistance using a calibrated swinging arm and rubber slider.
- The result is a PTV (Pendulum Test Value) – 36 or higher = low risk, 25–35 = moderate, below 24 = high risk.
- Recognised by the HSE, UKSRG and BS 7976-2 / BS EN 16165 as the definitive test for UK slip safety.
- Used for compliance audits, insurance claims and duty-of-care evidence under the Health & Safety at Work Act 1974.
Jump to:
What is Pendulum Slip Testing?
Pendulum slip testing is also commonly called the British Pendulum Test, pendulum test, PTV test or floor slip test. These terms usually refer to the same method of measuring slip resistance using a pendulum tester.
Pendulum testing uses a swinging arm fitted with a rubber slider (Slider 96 for footwear, Slider 55 for barefoot) to simulate a heel striking the floor.
As the slider contacts the surface, it loses momentum – the distance travelled after impact determines the Pendulum Test Value (PTV).
This method is:
- Accepted by the HSE and UK Slip Resistance Group (UKSRG)
- Reliable in both wet and dry conditions
- Admissible in court to demonstrate duty of care and risk mitigation
Pendulum testing is used in:
- Workplaces, retail, and commercial environments
- Public buildings and leisure centres
- Insurance claims and post-incident investigations
How Does the Test Work?
Pendulum testing is carried out using a Pendulum Skid Resistance Tester, a precise mechanical device approved by the HSE. The process simulates a heel strike under realistic walking conditions.
Here’s a quick overview of how the test is performed:
- A Pendulum Tester is set up on-site with a calibrated slider
- The slider swings down and strikes the surface
- The arm continues moving and stops – a needle records the PTV
- Tests are carried out:
- Wet and dry
- With and across foot traffic direction
- In multiple zones where relevant
To ensure results are accurate and representative, testing is conducted:
- In multiple directions (with/across/diagonal to foot traffic)
- On both dry and wet surfaces
- Using a certified and calibrated device operated by trained technicians
When performed correctly, pendulum testing offers a highly repeatable, legally defensible measure of slip resistance – suitable for use in court, insurance claims, or compliance audits.
What is a Good PTV Score?
After a pendulum test, you’ll receive a Pendulum Test Value (PTV) — this number indicates how slippery a surface is. The HSE and UKSRG classify these scores into three risk bands:
| PTV Score |
Slip Risk |
Typical Interpretation |
| 0–24 |
🔴 High risk |
Likely to fail safety requirements |
| 25–35 |
🟠 Moderate risk |
Caution required; may need mitigation |
| 36+ |
🟢 Low risk |
Meets HSE guidance for safe flooring |
A PTV of 36 or higher is considered the UK benchmark for low slip risk, even in wet conditions. Surfaces scoring below 24 are regarded as high risk, especially when exposed to contaminants like water, oil, or food – and are often referenced in legal claims as evidence of foreseeable hazard.
These thresholds are not arbitrary; they are standard across HSE guidance, UKSRG testing protocols, and civil litigation.
What Does PTV Mean?
PTV stands for Pendulum Test Value. It is the score recorded by the pendulum tester after the rubber slider passes across the floor surface.
The higher the PTV, the greater the slip resistance. A score of 36 or above is generally considered low slip risk in UK guidance. Scores between 25 and 35 indicate moderate risk, while scores below 24 indicate high slip risk.
Is Pendulum Testing a Legal Requirement?
The test itself is not named in law, but your legal duty to assess and control slip risks absolutely is.
Applicable legislation:
Under these laws, you must:
- Identify slip risks as part of your general risk assessment
- Take reasonably practicable steps to prevent them
- Maintain safe access and flooring
🧾 Pendulum testing is the most widely accepted way to demonstrate you’ve taken reasonable precautions – and is routinely used in court, insurance disputes, and HSE investigations.
How Often Should Pendulum Testing Be Carried Out?
The HSE doesn’t specify an exact interval, but floor surfaces should be re-tested whenever their condition changes or if a slip incident occurs. In most workplaces, annual testing is advised – more frequently for high-traffic or wet areas such as entrances, kitchens and pools.
- Every 12 months – routine verification for most floors
- Every 6 months – wet areas or where contaminants are common
- Immediately – after floor treatment, cleaning change or incident
Regular testing provides ongoing proof of due diligence and reduces liability in the event of a slip claim or audit.
HSE Standards & British Guidance
Pendulum testing is backed by:
🔎 HSE Quote: “The pendulum test is the HSE’s preferred method of assessing floor slipperiness.”
Source: HSE Slips & Trips Guidance
Compared to lab tests like the R-rating ramp test, pendulum testing:
- ✅ Is performed on-site, in real-world conditions
- ✅ Accounts for contaminants like water, oil, and food
- ✅ Is legally admissible in court
Wet vs Dry Testing Conditions
Floors must be safe under the conditions they are actually used in. The wet test is often the most critical, since most slips occur on contaminated or damp surfaces. Pendulum testing provides separate PTV scores for each condition.
| Condition |
Typical PTV Range |
Risk Rating |
Example Environments |
| Dry |
50–70+ |
🟢 Low risk |
Indoor corridors, offices, classrooms |
| Wet |
36–50 |
🟢 Acceptable (HSE benchmark ≥36) |
Entrances, kitchens, poolside walkways |
| Contaminated / Oily |
Below 24 |
🔴 High risk |
Industrial workshops, food prep areas |
Where floors regularly become wet or greasy, the wet PTV result is the benchmark for compliance. Regular re-testing helps ensure cleaning, maintenance and coatings continue to meet safety thresholds.
R Ratings vs PTV: What’s the Difference?
When assessing slip resistance, you may come across both PTV scores and R ratings. However, they are not interchangeable, and only one is recognised for legal compliance in the UK.
PTV (Pendulum Test Values) are measured using the pendulum device on real floors, under real-world conditions. In contrast, R ratings (e.g. R10, R11) are based on a German ramp test, conducted in a controlled lab.
Here’s how the two compare:
| Feature |
PTV (Pendulum Test) |
R Rating (Ramp Test) |
| 🇬🇧 Recognised in the UK? |
✅ Yes |
❌ No |
| Used by HSE? |
✅ Yes |
❌ No |
| Test location |
✅ On-site |
❌ Lab only |
| Legal admissibility |
✅ Yes |
⚠️ No |
In summary, while R ratings are commonly used in product brochures or by tile retailers, they do not meet UK legal requirements for assessing actual floor safety.
Only PTV values derived from pendulum testing are accepted by the HSE and UK courts.
Pendulum Testing vs Other Slip Resistance Methods
While the pendulum method is the UK’s gold standard, several other tests are sometimes used for product marketing or international comparison. Here’s how they differ:
| Test Method |
Also Known As |
Location |
Key Difference |
Legal Status in UK |
| Pendulum Test (BS 7976 / BS EN 16165) |
British Pendulum, PTV Test |
✅ On-site |
Simulates heel strike in wet/dry conditions |
HSE Preferred |
| Ramp Test (DIN 51130) |
R Rating Test (e.g. R9–R13) |
❌ Lab only |
Uses motor oil on an inclined ramp |
Not recognised by HSE |
| SlipAlert / Tribometer |
Dynamic CoF Test |
✅ Portable |
Measures coefficient of friction via slider speed |
Accepted for internal QA, not legal proof |
| Surface Roughness (Ra) |
Profilometer Test |
✅ On-site |
Measures texture only – no slip simulation |
Used as supporting evidence |
Only the Pendulum Test provides a result (PTV) recognised by the HSE, UKSRG, and UK courts as a true indicator of slip risk.
Where Pendulum Slip Testing Is Required
The HSE recommends Pendulum Testing wherever the floor surface could become wet, worn, polished, contaminated or difficult to manage safely. This can include public buildings, sports stadiums, railway stations, airports, schools, hospitals, commercial kitchens, leisure centres and industrial workplaces.
- Public buildings – schools, hospitals, libraries, and council facilities
- Commercial areas – shops, restaurants, offices, and supermarkets
- Leisure and sports venues – swimming pools, gyms, and stadiums
- Industrial workplaces – factories, warehouses, and vehicle workshops
- Outdoor walkways and ramps – especially where surface water collects
Routine slip resistance testing in these areas helps prove due diligence under the Health and Safety at Work Act 1974 and the Workplace (Health, Safety and Welfare) Regulations 1992.
How to Book a Slip Test
Need to arrange testing? Learn more about our Pendulum Slip Testing services, including what’s covered, how results are reported, and where we operate.
- ✔️ Certified, calibrated equipment
- ✔️ Wet and dry testing
- ✔️ PTV reporting with clear risk ratings
- ✔️ Optional surface roughness measurements
- ✔️ Legally defensible PDF reports
📞 Call: 01254 933 486
📩 Email: info@velocitysafety.co.uk
🌐 Or visit our website to book or request a quote.
FAQs
Here are the most common questions about pendulum slip testing, PTV values, wet testing, legal use and floor safety reports.
What is a Pendulum Slip Test?
A Pendulum Slip Test measures how slippery a floor is using a mechanical tester. It’s the UK’s legally preferred method for assessing real-world slip resistance, particularly in wet conditions.
Is Pendulum Testing a legal requirement?
Not by name – but UK law requires that slip risks be assessed and controlled. Pendulum testing is the most widely accepted method by the HSE, insurers, and courts.
What does PTV mean?
PTV stands for Pendulum Test Value – the number generated by the slip test. A PTV of 36 or higher is considered low slip risk according to HSE standards.
What is a wet pendulum test?
A wet pendulum test measures slip resistance after the surface has been wetted or contaminated to reflect realistic slip conditions. Wet PTV results are often more important than dry results for entrances, kitchens, pool surrounds, changing rooms and outdoor walkways.
What is the British Pendulum Test?
The British Pendulum Test is another name for pendulum slip testing. It uses a calibrated pendulum tester to measure floor slip resistance and produce a PTV score.
How long does a Pendulum Test take?
Testing one surface area takes about 30–60 minutes. Larger sites or multi-zone floors may take longer depending on layout.
Do I need to test wet and dry conditions?
Yes – especially if your floor may become wet. Wet PTV results are often more important for compliance and legal defensibility.
How often should floors be re-tested?
It depends on usage, surface changes, and exposure to contamination. Re-testing is usually advised every 12 months, or after any significant cleaning, wear, or slip incident.
Can I use R Ratings instead of a PTV?
No – R Ratings come from lab-based ramp tests and aren’t accepted in UK legal or compliance frameworks. Only PTV scores from Pendulum Testing meet HSE standards.
Resources & Further Guidance
