INDUSTRY (SRT & NTA 7909 & R BGR 181-ZH 1/571)

The Dutch Floor Testing Company conducts surface roughness measurements or slip resistance measurements on all hard floors, such as industrial floors. Upon request we will issue a certificate if the standard has been met.

Floors may cause nasty falls or slips with far-reaching medical and financial consequences. Often this is due to the fact that floors are too slippery, too rough, or they are wet or soiled. If you suspect that your floor is not safe, or if you want to be absolutely certain that your floor is safe enough: The Dutch Floor Testing Company measures the surface roughness or slip resistance of almost all floors.

For floor measurements in the wet industry we prefer the SRT method. 

SRT measuring method: NEN-EN 13036-4
Measuring instrument: Pendulum Skid Resistance Tester (SRT tester). Surface industrial floors (wet industry) slider: 96 or the Four S slider The measurements are carried out on a wet surface. This may be moisturised in advance. 
Type of surface: metal, synthetic, concrete, asphalt, tiles, wood, wearing courses.

At each location the instrument is checked by means of a zero measurement, and adjusted. Several measurements are carried out. As soon as the measured values are relatively constant, 5 measured values are recorded. In addition, the temperature and the type of surface are recorded. .
The average of the 5 measured values is the actual measured value. 


We follow the recommendation of the UK Slip Resistance Group.



Sometimes past R (BGR 181-ZH 1/571) values are requested. In that case we can also 
help you.

Measuring instrument: FSC 2011
Slider: leather, synthetic, rubber

Measuring method: NTA 7909:2003 – indicative conversion to R values.
Frictional properties of floors.
The NTA 7909:2003 does not apply any more, however, it is the only method which allows for an indicative comparison with R-values (This is based on our many years’ expertise and experience).
In 2015 the NTA 7909 was replaced by the NEN 7909.

Measurements are carried out both wet and dry.
Per measuring series 3 times wet and 3 times dry.
Measurements are carried out with 3 different sliders: leather, synthetic with profile, and rubber.
Per measuring location this therefore amounts to 18 measurements.
The average measuring values are conversed to R-values by way of indication.
Please note that for an exact R-value measurement according to the standard, the floor must be placed under a gradient. In the case of existing floors this is often impossible. In a laboratory it is possible, however, checking the floors on site may then cause problems.

As regards the R-value it is important to record whether a wet or a dry R-value is concerned.
We measure and record both wet and dry R-values.

Recommendation for testing:
For showers R 11 is often desirable.
For the wet industry or the industry with “powder”, R 11 – R 12 is often desirable.
For wet industry with an oil and grease load on the floor we recommend R 12 or R 13.