Product specification
Flexible clay sheets: the full specification
Everything needed to specify, quantify and detail the material — thickness, weight, bend radius, fire rating, substrates and coverage.
A flexible clay sheet is a 3mm mineral panel that carries the colour and texture of fired clay or quarried stone and bends cold around a radius. It is the finished form of Modified Clay Material, or MCM — the material page covers how it is made and why it flexes.
This page is the specification. If you are writing it into a schedule, everything below belongs in the clause.
Physical
Physical properties.
| Sheet sizes | 595 × 1195 mm · 595 × 2395 mm · 1195 × 2395 mmThree standard formats. The 2395mm lengths run floor to ceiling in one piece |
|---|---|
| Thickness | 2.5–3.5 mmVaries with collection; deep-relief faces sit at the upper end |
| Weight | Approx. 4.5 kg/m²Against 55–65 kg/m² for a 25mm natural stone slab |
| Minimum bend diameter | 381 mm (15 in)Cold, without scoring, heating or relief cuts. Equivalent to a 190 mm radius — the smallest circular column the sheet will wrap |
| Body | Inorganic mineral, polymer-modifiedPigment through the body, not a surface coating |
| Surface | Moulded physical reliefNot a print — the texture survives raking light |
| Translucency | TranslucentLight passes through the body, so backlit panels glow rather than staying flat |
Performance
Performance and durability.
| Fire classification | Level A1Highest non-combustible rating; usable on high-rise and escape routes |
|---|---|
| Water | Waterproof, water resistantNo efflorescence, capillary staining or salt bloom |
| Biological | Fungus and algae resistantHolds up on a shaded north wall through the monsoon |
| UV | Anti-UV, non-fadingMineral pigment, so a west elevation keeps its shade |
| Freeze-thaw | ResistantSuitable for hill-station and high-altitude projects |
| Emissions | No toxic releaseWater-based polymer modifier; nothing off-gasses |
Application
Substrates, fixing and handling.
| Substrates | Cement plaster, concrete, gypsum board, plywood, AAC block, brickwork, existing tileMust be sound, dry, dust-free and level |
|---|---|
| Fixing | Polymer-modified adhesive, notched trowelNo mechanical fixing, no support frame |
| Cutting | Knife or shears, on siteNo diamond blade, no water feed, no slurry |
| Pattern variants | Regular and RandomSpecify at order stage — it changes how the wall reads |
| Maintenance | Wash down with waterNo sealing cycle, no re-grouting |
The full method — substrate preparation, adhesive, application and curing — is on the installation page.
Quantifying
How to work out what to order.
Four things decide the quantity, and only the first is obvious.
1. Net wall area
Measure the actual clad area, deducting openings over about 0.5m². Small openings are not worth deducting because the offcuts around them rarely come back into use.
2. Wastage allowance
Allow 8–10% on a plain rectangular wall and 12–15% where there are many openings, changes of plane, or a strong directional pattern that has to align. Fine linear collections like Liner Stone want the higher figure, because a sheet cut across the run cannot be used elsewhere.
3. Returns and reveals
This is the one that gets missed. Window reveals, door jambs, column returns and the sides of any nib all take material and none of it shows on the elevation drawing. On a facade with punched windows the reveals can add 10% to the order on their own — measure them separately rather than folding them into the wastage figure.
4. Pattern variant
Regular pattern repeats the same face on every sheet; Random varies it so nothing repeats. Above roughly six square metres, Random is normally the right call — but it has to be decided at order stage, because the sheets are selected differently. Changing your mind later means a second order that will not match the first.
Attic stock
Order a little over and keep the remainder. A damaged sheet can be cut out and replaced without touching the ones around it, but only if you still have material from the same batch — and on a Random-pattern wall a later batch will not blend invisibly.
23 collections · 139 shades
Every property, on every sheet.
These are properties of the mineral body itself, so they hold across the whole range regardless of which face you specify.
- Light weight
- About 4.5 kg per square metre against 55–65 kg for a 25mm stone slab. No structural allowance, no backing frame.
- Thin
- 2.5–3.5mm finished thickness, so it lands flush with adjacent finishes instead of standing proud of them.
- Bendable
- Wraps a column down to 381mm (15in) diameter cold — a 190mm radius — with no CNC-cut curved sections.
- Level A1 fire retardant
- The highest non-combustible classification. Usable on high-rise elevations and escape routes.
- Waterproof
- The face sheds water rather than absorbing it, so it holds up in wet areas and on exposed elevations.
- Water resistant
- No efflorescence, no capillary staining and no salt bloom coming back through the finish.
- Freeze-thaw resistant
- Survives repeated freeze-thaw cycling without spalling — relevant for hill-station and high-altitude projects.
- Anti-UV, never fades
- Mineral pigment through the body, not a surface print, so a south elevation holds its colour.
- Translucent
- Light passes through the body, so a panel lit from behind glows rather than staying flat. Backlit façades and bar fronts become possible.
- Natural colour
- Colour comes from inorganic mineral powder, which is why it reads as fired clay rather than as paint.
- Paintable
- The surface takes mineral paint, so a colour can be changed later without stripping the cladding off.
- Low maintenance
- Wash down with water. No sealing cycle, no annual oiling, no re-grouting.
- No toxic release
- Inorganic mineral body with a water-based polymer modifier. Nothing off-gasses into the room.
- Fungus and algae resistant
- Holds up through a Bengaluru monsoon on a north wall without going green.
- Faster application
- Goes on with a notched trowel and adhesive. A team covers ground several times faster than with stone.
- Easy to install
- Cut with a knife or shears on site. No wet cutting, no diamond blade, no slurry.
- Recyclable
- No quarrying, no deforestation, and offcuts can be returned into the material stream.
FAQ
Specification questions
How thick and how heavy is flexible clay cladding?
Finished thickness is 2.5–3.5mm depending on the collection, and weight is approximately 4.5 kg per square metre. For comparison, a 25mm natural stone slab weighs roughly 55–65 kg per square metre, so the same elevation carries under a tenth of the dead load.
What substrates can it be applied to?
Any sound, dry, level substrate: cement plaster, concrete, gypsum board, plywood, AAC block, brickwork and existing tile. The substrate needs to be free of loose material and dust, and level enough that undulation will not show through — deep-relief collections are less forgiving here than flat ones.
What is the difference between Regular and Random pattern?
Regular pattern repeats a uniform face across every sheet, so veining and coursing align tile to tile — useful for book-matched effects and for tight, controlled walls. Random pattern varies the face sheet to sheet so no repeat is visible, which is what makes a large wall read as genuinely quarried. Above roughly six square metres, Random is usually the better call.
What sheet sizes are available?
Three standard formats: 595 × 1195 mm, 595 × 2395 mm and 1195 × 2395 mm. The 2395mm lengths run floor to ceiling in a single piece on most Indian residential heights, which removes the horizontal joint entirely. Because the material cuts with a knife on site, sheet size mostly affects joint layout rather than what is buildable — send us the wall dimensions and we will advise the most efficient set-out.
Is the material translucent, and can it be backlit?
Yes. Light passes through the body, so a panel lit from behind glows rather than staying flat — the effect people associate with backlit onyx, at a fraction of the weight and cost. Mount an even LED panel or a diffused strip array behind it rather than point sources, which show as hot spots through a 3mm sheet. Pale shades transmit most; dark ones read as a subtle halo at the joints. It works on façades, bar and reception fronts, and printed feature panels.
Get a quote
Tell us about the wall.
Send us the wall dimensions, the openings and the substrate. We will come back with sheet quantities, a set-out suggestion and a written price.
Request a quote
Send us the area, the substrate and the finish you have in mind. We reply with shade options, a written price and a lead time — usually the same working day.
The enquiry form loads in a moment. If it does not, email us at enquiry@curvato.in and we will pick it up from there.
Get a quote
Need a specification clause or a data sheet?
Tell us the project and we will send the technical data sheet and a draft specification clause you can drop into the schedule.
- Thickness
- 2.5–3.5 mm
- Weight
- ~4.5 kg/m²
- Fire rating
- Level A1
- Min. bend dia.
- 381 mm (15 in)