Technical · glazed ceramic · GlassProtect
Sealing a vitrified glaze.
The specifier's version. What a glazed ceramic surface actually is, how a sol-gel nano layer bonds to it, the four resistances that decide real-world durability with their honest bounds, and the test standards behind the numbers. GlassProtect is the one and only next-generation sol-gel surface coating in Australia, and this is why it works on a glaze.
The substrate
A glaze is a fired glass.
A glazed ceramic tile is a porous clay body finished with a thin fired glassy layer. That glaze is a vitrified silicate: chemically it's a glass, and its surface carries the silanol (Si-OH) sites that matter. The clay body underneath is porous, but it's sealed off by the glaze, so for sealing purposes the surface we're treating is the glass layer, not the body.
A fired glassy silicate layer over a porous clay body.
The coating built for glass and vitrified surfaces.
The glaze is silanol-rich: our best-case bonding surface.
A clear nano-thin bonded network, optically invisible.
Splashbacks, subway tile, wet areas, bathroom and kitchen.
On the repellency function, remedy is re-treatment.
The mechanism
A glaze is our best-case surface.
The shared chemistry is the same on any glassy surface: GlassProtect condenses covalent Si-O-Si bonds to the surface silanols and lowers the surface energy, so water sheets off and mineral scum and lime can no longer grip. We walk through that in full in how glass coating works. What is specific to a glaze is why the bond is optimal, and what that means for spotting and etching on a tile.
Silanol-rich, so the bond is optimal
A fired glaze is a vitrified silicate, chemically a glass, and its surface is dense with silanol (Si-OH) sites. Our sol's own silanols condense straight against them into a continuous Si-O-Si network roughly 75 to 100 nm thick, chemically continuous with the glassy surface, not a film resting on top. It is optically clear at around 99% clarity and non-pigmenting, so the tile keeps its exact colour, gloss and feel. This is the same bonding chemistry that makes glass our best-case surface, and a glaze hands it to us on a tile.
No pores, so there is nowhere for a sealer to hide
On porous stone a penetrating sealer builds its repellency down the pore, out of reach of the cleaning. A glaze has no open pores, so that route is off the table entirely: the only ways to treat it are a film resting on top, which chalks and peels, or a network bonded to the glassy surface, which holds where the cleaning and wear actually happen. The full three-way comparison of film, pore sealer and bonded network is in sealer types compared.
Spotting and etching, the vitrified truth
On a coated glaze, water sheets off with far less dwell, so fewer minerals are left behind, and what does land does not bond, so it lifts with a quick wipe or squeegee. On bare glaze, hard water scale bonds on and eventually etches the glass for good. That is the vitrified difference: far less spotting, and the spotting you do get wipes away instead of etching in. GlassProtect resists the mineral etching that permanently ruins bare glass by keeping hard water from dwelling long enough to attack.
GlassProtect does not make a glaze that never needs a wipe. It makes one where a wipe is all it ever takes: minerals and soap scum can no longer bond, so what lands lifts with a quick wipe or squeegee instead of etching in for good. It does not stop physical scratching or every chemical.
Why it lasts
Built for cream cleanser and scum.
A tile in service is scrubbed, sprayed with cleaner and, on a wall or facade, hit by sun. Those loads all act at the surface, in the top sub-millimetre, which is exactly where the bonded network sits. The shared story, cleaning, chemical and UV resistance with their honest bounds, is set out in the four real-world resistances. In short: the inorganic backbone survives routine alkaline cleaning without oxidising, it does not yellow or chalk like an organic film, and none of it is stated as immunity. On a glaze, two of the four decide it.
Oil is the resistance that decides a glaze
A glaze does not cloud from water, it clouds from oil. Soap scum is an oily calcium-stearate film, and kitchen grime is airborne cooking oil, and a water-repellent-only coating gets wetted and fouled by both, which is why glass can bead beautifully and still haze over with scum. GlassProtect starts higher on oil, an oil contact angle around 84 degrees initially, so it lifts the oily film off a shower screen or a splashback that a water-only coating cannot shift. Bound: that oil figure is initial-only, never a retention or head-to-head claim, and no fluorine-free coating matches fluoropolymer oil repellency.
Cleaning is what wears a glaze coating out, not the water
The load-bearing Si-O-Si network sits right where cream cleanser and the scrub pad act, so durability comes from network density and crosslink redundancy, not hardness. It fades by slow nano-scale abrasion with no cliff-edge and no strip to renew. Retention datapoint: GlassProtect is still beading above 100 degrees at 3,000 cream-cleanser scrub cycles, roughly 3 times slower repellency loss than the leading brand. Bound: durable, not scratch-proof.
The principle in one line: we protect against the real-world use of a tile, the cleaning, the chemicals, the sun and above all the oil, because the protection sits at the surface where that use happens.
The evidence, and the limits
What we can stand behind.
The evidence
- Contact-angle retention is the accepted measure of durability on a glassy surface, run under recognised wet-scrub and abrasion standards: ISO 11998 wet-scrub, ASTM D2486, ASTM D4060 Taber, ASTM C813 and D8380.
- Still beading above 100 degrees at 3,000 cycles in cream-cleanser scrub testing, around 3 times slower repellency loss than the leading brand in comparable testing.
- Independently certified coating, through recognised labs including TÜV Rheinland, SGS, Intertek and REACH.
The honest limits
- It's a long-lasting treatment, not permanent, not maintenance-free, not waterproof. It degrades slowly and needs periodic reapplication, though it tops up without stripping.
- The oil contact angle is an initial figure, never a retention or head-to-head claim.
- Chemical stability is bounded to routine-cleaning pH and short contact. More resistant, not immune.
- The grout lines are a porous cementitious surface, a separate coating job, not covered by the glaze treatment.
Specifier questions
The detail, answered.
Why does GlassProtect bond to a glaze at all?
Because a fired glaze is a vitrified silicate, chemically a glass, and its surface carries silanol (Si-OH) groups. The sol-gel's own silanols condense against them into covalent Si-O-Si linkages and cross-link laterally into a dense network. It's the same bonding chemistry that makes glass our best-case surface.
How is durability actually measured here?
By contact-angle retention under wet-scrub and abrasion cycling, using standards like ISO 11998 and ASTM D2486. A glaze doesn't cloud from water, it clouds from dried mineral spots and oily scum that people attack with cream cleanser and a pad, so the meaningful test is how much water repellency survives that cycling. GlassProtect is still beading above 100 degrees at 3,000 cycles.
What does "3× more durable than the leading brand" mean precisely?
It's a bounded comparative: around 3 times slower loss of water repellency in comparable cream-cleanser abrasion testing. It names no specific brand and it's evidenced by the retention data.
Does it change slip, gloss or colour?
Colour and gloss, no, it's optically clear and non-pigmenting at around 99% clarity. On slip we make no rating and no safety claim; any comparison is only relative to a film, never an absolute figure.
Does a sealed glaze still need any upkeep?
Yes, and here is the honest version. The hard part is done: GlassProtect turns keeping a glaze clear from a job with a razor blade and a bottle of acid into a quick wipe or squeegee, because minerals and soap scum can no longer bond to the surface. Constant hard, bore or reticulation water left to dry with no upkeep can still leave spots, on any surface on earth, but on a coated glaze those spots wipe away, where on bare glass they bond on and etch in for good. You are not buying a surface that never needs a wipe. You are buying one where a wipe is all it ever takes.
What about the grout?
The glaze and the grout are two different surfaces. The glaze is vitrified and takes GlassProtect. The cementitious grout is a porous mineral surface that takes a different coating. On a real floor or wall we assess and quote both, so the whole surface is protected properly, not just the tile face.
Go deeper on the science
The shared chemistry, in full.
Pillar
How glass coating works
The full mechanism a glaze shares with glass: how the clear nano layer bonds, and the honest truth on spotting, scum and etching.
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, pore sealer and bonded sol-gel, side by side, so you can see why only a bonded network holds on a non-porous glaze.
Read the pillarPlain-English version
Sealing glazed ceramic tile
The homeowner's guide to this surface: the problem, the fix and the proof, no chemistry required.
Read itBrowse
The Sealing Library
Every common WA surface, by material, matched to how well our coating protects it.
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