Whether parquet flooring or wooden stairs, oiled wood surfaces with HS Professional Oil are in demand. No wonder: not only do they look naturally beautiful, they also feel pleasantly warm underfoot and can be re-oiled at any time. But the question occupying many professionals and developers is: Are oiled wood surfaces also slip-resistant - and where is this particularly important?When safety is involved, the authorities take a close look.
The German Workplace Ordinance (ArbStättV) and the Technical Rule ASR A1.5 “Floors” clearly stipulate: Wherever there is a risk of slipping, the floor must achieve a specific slip-resistance class (R class).
And how is it tested? Using the inclined-plane test: A wood sample is wetted with oil, placed on an inclined plane and slowly tilted. A tester wearing standardized shoes walks across it - until they slip. The angle of the first slip determines the class. It sounds like balance training in a laboratory - but it is a strictly standardized procedure according to EN 16165.
Whether wood floors or stairs, tested safety is important everywhere. Indoors, the following applies:
- R9: dry areas such as offices - this is the minimum level of safety.
- R10: schools, preschools or retail areas - anywhere many people are walking.
- R11: more heavily used or damp areas such as entrances, canteens or washrooms.
- R12/R13: the realm of commercial kitchens and slaughterhouses - wood prefers to say: “No, thank you.”
The accredited institute specializes in wood surfaces and tests strictly according to EN 16165. The result: an independent test certificate - instead of a nice self-certification.

With HS Professional Oil, your floors keep their look - and your steps keep their grip.
R10 as standard, R11 with the 2K version - tested and officially confirmed.
This combines a natural wood look with reliable slip resistance - whether at home, in commercial premises or even on the way to your next coffee break.
The OLI-NATURA HS Professional Oil is available from selected specialist retailers and online -
for commercial customers at b2b.oli-lacke.de
and for private customers at oulinaturashop.com.
Our application team is available at any time to answer all your questions about the product - by phone or by email at faq@oli-lacke.de.