Is All Microcement the Same?
The chemistry that separates one system from another

So what actually differs between microcement systems?

The single most useful thing a buyer can learn is that the word "microcement" describes a format — a thin, seamless, trowel-applied mineral coating — not a formula. The format is shared. The binder chemistry holding it together is not, and that is where the performance lives.

There are three binder families you will run into:

Acrylic-cement microcement

An acrylic polymer mixed with cement. It is the most common entry-level system and the easiest to apply. It can look lovely on day one. The trade-offs show up over time: acrylic binders are more rigid, so they are less forgiving of substrate movement, and the budget acrylic topcoats often paired with them can dull or chalk after a few years in a sunlit room.

Epoxy-modified microcement

Here epoxy resin does the binding, or a clear epoxy is used as an aggressive topcoat. Epoxy is hard and chemically resistant — genuinely useful in industrial settings — but it tends to be brittle at the edges and is well known to amber under UV. These systems are real, and they are frequently sold under the same "microcement" label — which is exactly why reading the technical data sheet matters.

Polyurethane-mineral microcement

A modified polyurethane resin bound with a selected mineral aggregate. Polyurethane is the same elastomeric polymer used in running-shoe midsoles and automotive suspension bushings because it bonds tightly while still flexing with whatever it is bonded to. Paired with a hard mineral aggregate and a UV-stable polyurethane topcoat, this is the premium decorative tier — and it is the family our PURO system belongs to.

If you want the full chemistry deep-dive on why these three behave so differently, I wrote a separate piece on exactly that: the best polyurethane microcement — why formulation matters more than brand.

How do you tell them apart? Read the TDS, not the brochure

You do not need to be a chemist to sort this out. You need one document and one line on it.

Ask for the current technical data sheet (TDS) of any microcement you are considering, and find the "Chemical Nature" line for two layers: the decorative coat and the topcoat. That single line tells you which of the three families you are actually buying.

For our SuperTitanium BC, that line reads "modified polyurethane resins in aqueous emulsion." If the same line on another product reads "acrylic" or "epoxy resin," you are no longer comparing the same thing — and you now know which trade-offs come with it.

If the sheet is hard to get, ask again until you have it. Any established manufacturer publishes the binder chemistry of its own product — it is not a trade secret. For a structured, side-by-side method — including the exact questions to ask — see how to compare microcement systems by TDS and the ATRIA microcement system layers explained.

Where ATRIA's PURO system sits — and why I'll be specific

Now that the categories are clear, I can be precise about what we make.

ATRIA PURO is a polyurethane-mineral system, manufactured by Colorificio Atria in Partanna, Sicily, where the company has been making decorative finishes since 1968. The flagship decorative coat, SuperTitanium BC, is a two-component modified polyurethane resin in aqueous emulsion, bound with a quartz, marble sand, and Etna volcanic mineral blend. Each mineral earns its place: quartz brings hardness and abrasion resistance, marble sand adds brightness and a refined character, and the Etna volcanic mineral contributes density and mechanical interlock.

The numbers on the SuperTitanium BC technical data sheet are the part I am proudest of, because they are measured, not marketed:

• Compressive strength 32 ± 2 MPa at 28 days (EN 1015-11)
• Adhesion on concrete above 3–3.5 MPa after 7 days; ASTM D4541 adhesion above 2.5 N/mm²
• Shore D hardness above 65
• Service temperature −10°C to +120°C
• A hard-elastic, closed-pore cured film that limits dirt absorption and cleans easily

Over that decorative coat goes New Atriapol Antibacterial, a two-component polyurethane topcoat that is specified as non-yellowing and UV-resistant and is tested to ISO 22196:2011 for antibacterial performance (against E. coli and Staphylococcus aureus), with EN 1542 adhesion above 3.6 MPa.

Here is the distinction I will put my name to: ATRIA PURO carries polyurethane in the decorative microcement layer itself — not just in the topcoat — and no microcement system we have verified, TDS in hand, does the same. Many systems marketed as "polyurethane microcement" put the polyurethane only in the sealer on top. Ours runs through the finish. Ask any supplier to show you the same, layer by layer, in their TDS. That is the whole point of the system, and it is why I am happy to publish every number above.

What about wet areas and yellowing — the two questions that follow

Once people accept that microcement systems differ, two practical questions always come next.

Is microcement waterproof?

Installed correctly, an ATRIA microcement shower or wet room is a waterproof system. The build starts with a code-compliant waterproofing membrane or liquid-applied waterproofing layer; the microcement system — primer, reinforcement where needed, SuperTitanium BC decorative coats, and the closed-pore, anti-absorbent New Atriapol Antibacterial polyurethane topcoat — is installed over it. Built that way, the finished assembly is waterproof and fully suitable for showers, tub surrounds, spas, and steam rooms, with no grout lines to fail. The waterproofing is delivered by the membrane within the assembly — the decorative coating itself is not a standalone membrane, which is exactly why a proper waterproofing layer always goes underneath it. The full method is here: can microcement be used in showers?

Does it yellow?

Only if the topcoat chemistry invites it to. Epoxy and aromatic-polyurethane topcoats are more prone to ambering under UV; a UV-stable aliphatic polyurethane topcoat resists it. Our Atriapol topcoat is specified as non-yellowing and UV-resistant for exactly this reason. The chemistry behind that is its own article: does microcement yellow? the chemistry behind the answer.

So — is all microcement the same?

No. The word is a category, not a guarantee. Underneath it are three binder chemistries that age very differently, and the only reliable way to know which one you are buying is to read the technical data sheet and ask what chemistry lives in each layer.

That is not a reason to be nervous about microcement. It is a reason to choose a system that can show its paperwork. Ours can — from the quartz, marble sand, and Etna volcanic mineral in the decorative coat to the ISO-tested antibacterial topcoat sealing it.