Technical · GlassProtect on vitrified porcelain
The science of sealing polished porcelain.
The specifier-level version: why polished and lappato porcelain has an open surface at all, how a sol-gel nano layer works on a vitrified body, the four resistances that matter with their honest bounds, and the standards behind them.
Transparent inorganic nano layer, roughly 75 to 100 nm cured.
Condenses to the vitrified surface silanols. Colourless, non-pigmenting.
Vitrified body with an open, ground surface layer.
A best-fit surface for this coating.
Comparable cream-cleanser abrasion testing. Renews by top-up, not strip.
On the repellency function, per job. On top of your Consumer Law rights.
The substrate
A vitrified body with an open face.
Fired porcelain is a dense, vitrified ceramic with very low bulk water absorption. On its own it barely needs sealing. The complication is the finish. To produce a polished or lappato surface, the fired tile is mechanically ground and polished, and that process cuts through the sealed skin and exposes a shallow layer of open micro-porosity.
Vitrified, then ground open
The bulk body is glass-like and non-absorbent, but grinding for gloss opens surface micro-pores that were not there on the as-fired face. Lappato is the same story at a semi-polished level: part of the surface is ground, part left matte.
The pits are the fault line
Those open pits are where mop residue, body oil, food oil and cement grout haze lodge and dry. It presents as streaking, cloudiness and marks that survive normal mopping, on a tile marketed as low-maintenance.
Legacy sealers are the wrong tools
A penetrating stone impregnator relies on a porous mineral to key into and does effectively nothing on a vitrified body. A topical film covers the pits but lays an organic membrane over the gloss that hazes, scuffs and later has to be stripped.
The mechanism
Silanols like glass, plus the pits.
Porcelain is a vitrified silicate, so like glass it carries reactive silanol groups at the surface. That is the one place the porcelain story differs from plain glass: the coating gets two anchors at once, not just the glassy face.
Two anchors, not one
On the silanol-rich vitrified face the pre-hydrolysed sol condenses genuine Si-O-Si bonds continuous with the surface as it cures, and it also self-condenses into a dense network keyed into the open micro-pores left by polishing. So the bond is chemical at the face and mechanical into the pits, roughly 75 to 100 nm and optically clear, where a discrete film would just sit on top.
The rest is the glass mechanism
Once bonded, it behaves like GlassProtect on any vitrified surface. Surface energy drops, water sheets and rolls off with far less dwell, and the colour and gloss of the tile are unchanged. The full picture, roll-off versus beading, the contact angles and colourless by design, lives in the glass pillar.
The four resistances
All at the surface, where the floor works.
A floor in service meets mechanical, chemical, UV and oil loads, and all of them act in the top sub-millimetre. Because the coating lives at the surface rather than down a pore, it meets those loads together, each with an honest bound and none as immunity. On polished porcelain the one that bites is oil: foot oil and food oil that would otherwise key into the polishing pits sit on top and lift in cleaning instead, while the inorganic backbone shrugs off the repeated alkaline floor cleaning that consumes an organic film. The full four-resistance breakdown, with the pH, UV and abrasion bounds spelled out, is its own pillar.
Against the alternatives
Why the legacy tools miss this tile.
The category had two older ways to seal, and on a polished vitrified body both are the wrong tool. A penetrating impregnator is built to line the pores of a porous mineral, so on a vitrified porcelain body it has nothing to grip and does effectively nothing. A topical floor film does cover the polishing pits, but it lays an organic membrane over the gloss you paid for, then hazes, scuffs and later has to be stripped. A clear network bonded at the surface is the third way, and it is the only one that engages this tile without sitting on top of it. The full film versus impregnator versus bonded comparison, with the honest trade-offs of each, is its own pillar.
Honest limits
Where it stops.
A specifier deserves the boundaries in plain terms. Naming them is the point, not a footnote.
- It is not permanent and not maintenance-free. It is a long-lasting treatment that degrades slowly and predictably and needs periodic top-up. The guarantee runs on the repellency function, not on wear or physical damage.
- It is not scratch-proof. The win is chemical stability and surface energy, not mechanical hardness. Grit underfoot can still abrade a polished porcelain face.
- We reserve the permanent-etching prevention claim for glass. On porcelain the benefit is easy-clean and mark resistance. We do not extend the glass etch claim to this surface.
- Grout is treated on its own terms. Cementitious grout is a porous mineral, so it protects by a different mechanism than the vitrified tile. We assess and treat it appropriately rather than assume one product does both.
Evidence and standards
How the durability is measured.
Durability on a vitrified surface is measured as contact-angle retention across recognised wet-scrub and abrasion cycles, not as a single hero number. The relevant standards for a coating on this substrate:
Film performance across repeated scrub cycles. GlassProtect still beads above 100 degrees at 3,000 cycles.
Companion scrub-cycle method for surface coatings.
Wettability of the treated vitrified surface.
Purpose-built for sub-100 nm coatings on glass. Advancing and static figures are not interchangeable.
Independently evaluated at recognised houses including TÜV Rheinland, SGS and Intertek, and REACH-compliant. Note that REACH compliance is a regulatory status, not a PFAS analysis. Full data sheets are available on request.
Specifier questions
The technical detail.
If porcelain is vitrified, what is the coating bonding to?
The vitrified surface is a silicate and carries reactive silanol groups, the same anchor glass provides. The sol condenses Si-O-Si to those silanols on cure, and it also self-condenses into a dense network keyed into the open micro-pores left by polishing. So the bond is chemical at the face, plus mechanical keying into the ground surface.
Does the coating fill the polishing pits or just coat over them?
Both effects matter. The thin sol wicks into the open micro-pores and condenses there, so it occupies the hiding places, and it lowers the surface energy across the whole face so contaminants cannot wet in. It is not a thick fill that would change the gloss. It is a nano-thin, conformal layer.
Why not just use a penetrating sealer like on stone?
A penetrating impregnator is designed to line the pore network of a porous mineral. A vitrified porcelain body has no such network for it to occupy, so it has nothing to grip and does effectively nothing. The right tool here engages the surface, not a pore system that is not there.
Will it change the slip characteristics of the floor?
The coating is thin and conformal and does not lay a film over the surface texture the way a topical sealer can. We do not publish a slip rating claim in either direction, and for a commercial or wet-area floor we will discuss the specifics with you rather than hand-wave it.
Does a sealed floor still need any upkeep?
The hard part is done. GlassProtect turns cleaning polished porcelain from scrubbing and chemicals into a routine wipe or mop, because oil, mop residue and dissolved minerals can no longer key into the open polishing pits. It is not maintenance-free. Constant heavy soiling left to dry can still leave marks on any floor on earth, but on a coated face those marks sit on top and lift in cleaning, where on a bare polished face they lodge in the pits and dry in. You are not buying a floor that never needs a wipe. You are buying a floor where a wipe is all it ever takes.
What is the renewal and guarantee position?
It renews with a top-up on a clean surface, with no strip and no cliff-edge failure. Each job is registered under a 10-year guarantee on the repellency function performing as described, which sits on top of your Australian Consumer Law rights.
Go deeper
Into the science.
Pillar
How glass coating works
The shared sol-gel mechanism in full: bonding to the silanols, roll-off versus beading, and colourless by design on any vitrified surface.
Read the pillarPillar
The four resistances
Cleaning, chemical, UV and oil, each with its honest bound, and why protection has to live at the surface where the wear lands.
Read the pillarPillar
Sealer types compared
Film, impregnator and bonded coating side by side, with the honest trade-offs of each and where the new class wins.
Read the pillarThe plain-English guide
Sealing polished porcelain
The same story without the chemistry: what goes wrong on a polished floor, how we fix it, and what it costs.
Read the plain versionRelated surface
Sintered stone slab
The same vitrified body as a benchtop slab, and how the coating handles it.
Read the guideThe whole library
The Sealing Library
Every surface and every pillar in one place, from stone and concrete to glass and porcelain.
Browse the libraryGet a quote
Specify it once.
We will prepare and seal your polished porcelain with GlassProtect, applied to a certified standard and registered under a 10-year guarantee. Confirmed price before you book.