Anti-Slip Treatment for Porcelain Tiles: The Numbers Before and After

By Walkway Management South Florida

A tile manufacturer sent us a sample of smooth, silk-finish porcelain with a fair question: does an anti-slip treatment for porcelain tiles actually change anything, or does it just look like it should? We tested the sample wet, applied our T2 High-Traction Treatment, and tested it wet again with the same instruments, the same wet contaminant, and the same protocol both times. Photographed side by side, the two surfaces are indistinguishable. The test results are not.

That gap — identical to the eye, radically different underfoot — is the whole reason a claim like “this treatment works” has to be backed by a number instead of a glance.

The Porcelain Tile Before Any Anti-Slip Treatment

We started with a Pendulum Slip Tester test per ASTM E303-22, using a Knightcott Pendulum TRRL-type skid tester with two slider types: Hard Slider #96, which approximates a shod pedestrian, and Soft Slider #55, which approximates bare feet. Dry, the sample tested well: a Pendulum Test Value (PTV) of 67 with the hard slider and 101 with the soft slider, both comfortably inside the “low slip potential” band the standard sets at 36 PTV and above.

Wet, both numbers collapsed. The hard-slider PTV dropped to 14; the soft-slider PTV dropped to 11. Under ASTM E303-22’s classification, anything below 25 PTV is high slip potential. A companion wet DCOF reading on the BOT-3000E, run per ANSI A326.3, came back at 0.33 — well short of the 0.42 minimum that standard requires for a level interior-wet floor.

None of this is unusual for a smooth, polished finish. A silk finish leaves very little microscopic texture on the surface, and it’s that texture — the peaks and valleys a floor scientist calls asperities — that lets a shoe or a bare foot punch through a film of water and find real contact. Sand the texture away for the sake of a glossy look, and you sand away the floor’s ability to stay in contact once it’s wet.

What the Anti-Slip Treatment for Porcelain Tile Changed

We applied our T2 High-Traction Treatment to the same specimen and re-tested it wet, using the identical equipment and method as the baseline. The surface looked exactly as it had before treatment — no visible etching, no haze, no change in gloss.

The wet pendulum numbers moved substantially. The hard-slider PTV rose from 14 to 62, moving the sample from high slip potential all the way into low slip potential. The soft-slider PTV rose from 11 to 33 — a real improvement, though it landed in the “moderate” band (25–35 PTV), not low. The wet DCOF reading rose from 0.33 to 0.76 on the BOT-3000E — a result that clears not just the 0.42 minimum for a standard interior-wet floor, but the 0.55 minimum ANSI A326.3 sets for its toughest categories, exterior-wet and oils/greases.

Reading the Numbers Honestly

It would be easy to stop at “the treatment worked” and leave it there. The full picture is more useful than that.

The shod (hard-slider) result is the strongest evidence here: a floor that was high slip potential wet is now low slip potential wet, by both the pendulum and the DCOF method. For a walkway where people wear shoes, that’s a real, measurable improvement.

The barefoot (soft-slider) result improved just as sharply in relative terms — from 11 to 33 — but it stayed in the moderate band rather than reaching low. That distinction matters most in barefoot environments like pool decks and locker rooms, where the bar is often set higher. A wet PTV of 33 sits in the moderate band for a barefoot area like a pool deck, where our risk-based target is a wet PTV of 40 or higher with the barefoot slider. The wet DCOF of 0.76 clears the 0.42 wet DCOF that ANSI A326.3 references, and under the ISPSC a design professional may use either the pendulum classification or that DCOF alternate. Two methods, read together, give a fuller answer than either one alone — which is exactly why the pendulum test remains the reference method for assessing slip resistance directly, while a tool like the BOT-3000E is well suited to jobs like this one: confirming that a specific treatment changed a specific surface, and by how much.

Why a Wet Test Beats a Look

Slips almost never happen on a dry floor. They happen when a thin film of water, soap, or grease gets between a sole and the surface faster than the surface can squeeze it back out. A smooth, silk-finish tile gives that film nowhere to escape, so the shoe or foot rides on top of it instead of gripping through it. A traction treatment doesn’t need to change what a floor looks like to change that outcome — it only needs to restore enough microscopic texture at the surface to break the film. That’s exactly what this specimen’s numbers show: identical appearance, very different traction, because the property that matters here was never visible in the first place.

What This Means for Your Floor

One specimen is one specimen, not a universal promise. What it does prove is that an anti-slip treatment for porcelain tiles can move a floor from a documented, high-risk wet reading to a documented, passing one — and that the only honest way to know whether that happened, on this tile or any other, is to test the same surface the same way, wet, before and after. A treatment that isn’t verified is still just a claim. We’d rather hand a client a number.

If you’re specifying porcelain for a new project, maintaining a floor that’s gotten slicker over time, or considering a traction treatment and want to know whether it actually did anything, request a slip resistance test or a quote from Walkway Management South Florida at trustwalkway.com.