FAQ · 26 answers
Flexible stone, answered straight
Everything buyers ask before the first order: what a flexible stone panel is made of, how thin it goes, where it fails, and what it costs to get on a wall. Where a supplier would normally hedge, we give you the number.
01 The material
What flexible stone actually is
01
What is flexible stone?
A 3 mm mineral sheet that looks like quarried stone and bends around a 200 mm pipe. It is clay and mineral aggregate, formed at low temperature and bound with an inorganic copolymer. There is no plastic core and no stone skin glued on top — the sheet is the same material all the way through, which is why a cut edge matches the face. The trade shorthand is MCM.
02
Is flexible stone veneer the same as soft stone or MCM?
Yes. Flexible stone veneer, flexible stone panel, flexible stone cladding, soft stone panel, bendable stone veneer and MCM all point at the same family. The words do not tell you what you are buying; thickness and binder do. Some suppliers ship 2–3 mm and call it 3 mm, which is where the quality difference actually lives.
03
What is it made of, and is there plastic in it?
Clay, mineral aggregate and an inorganic binder, cross-linked at low temperature. No PVC, no fibreglass mesh, no resin face. That is also why it passes A2-s1,d0 rather than landing in the B classes where resin-based panels sit. A flame test on a cut-off corner tells you more than any datasheet.
04
What does MCM stand for?
Two different things, and mixing them up is expensive. In this trade, modified clay material. In aluminium cladding, metal composite material — an aluminium-skinned panel with a polyethylene or mineral core, a completely different product at a different price. If a quote says MCM, ask whether the panel is mineral or metal before you compare anything else.
05
Does it look real up close?
The stone series is pressed from mineral aggregate, so the surface has depth and shifts from sheet to sheet. The printed series is flatter by nature — good at three metres, less convincing at thirty centimetres. Judge it under raking light with a physical sample. Photographs flatter every finish, ours included.
02 Numbers
Thickness, weight and the ratings that get checked
06
How thick is flexible stone?
3 ± 0.3 mm on 1200 × 600 mm sheets. Large-format panels start at 4 ± 0.5 mm, and 3D relief runs 5–15 mm. That puts it in the thinnest bracket of thin stone veneer products, where most of the alternatives are laminated sheets with a resin skin. The tolerance matters more than the number: a 2 mm sheet quoted as 3 mm chips at the edge in the carton and shows every knock once it is on the wall.
07
How much does it weigh?
6 kg per square metre, about 4.3 kg for a 1200 × 600 mm sheet. Thirty-millimetre granite cladding of the same area is roughly 80 kg. That ratio is the whole reason the product exists: it goes on upper floors, over old render and around columns without anchors, a crane or a structural survey.
08
What sizes do you make?
1200 × 600, 600 × 3000, 1200 × 2400, 1200 × 2800 and 1200 × 3000 mm. Smaller sizes are also cut from the big panels on request. Bear in mind that every joint is a line you will see, so the largest panel your access allows is usually the best drawing.
09
What fire rating does it have?
EN 13501-1 A2-s1,d0, tested to EN 13823. Limited combustibility with minimal smoke production — the class most commercial interiors and most European facades ask for. It is not A1, and any supplier claiming A1 for a polymer-bound panel is worth a second look.
10
Is flexible stone waterproof?
No. Water absorption is 5.41% by ASTM C97. That is low enough to sit on an exterior wall with a drained, sound substrate behind it, and nowhere near a waterproof membrane. Treat the panel as the finish, not the weatherproofing. If the wall is already letting water in, fix the wall first — the panel will not do it for you.
11
How far can it bend?
Around a 200 mm cylinder without cracking, tested to JG/T 311-2001. Tighter than that and you are segmenting the curve or moving to relief panels, which is a different conversation and a different price.
03 Where it goes
Surfaces it can and cannot take
12
Can flexible stone panels be used outdoors, or on a high-rise?
Yes to both, on a drained and sound substrate. Twenty freeze-thaw cycles came back with no cracks or bubbles, and the panels ran from −40 to 80 °C without change (ASTM C1026). The weight is what makes tall buildings practical: 6 kg per square metre does not need the support frame that 80 kg does.
13
Can I use it in a bathroom or a shower?
On the walls, yes. It is a finish, not a tank — waterproof the wet zone behind it exactly as you would for tile, then bond the panel to that. Constant spray and standing water are not what this material is for, and a supplier who says otherwise has not read the absorption figure.
14
Can it go behind a fireplace or on a ceiling?
Both, with the usual caveats. On a fireplace surround, keep the code clearance to the firebox and bond to a stable substrate — never inside the box itself. On a ceiling, the low weight is an advantage over stone, but add mechanical support to whatever the local code requires rather than relying on adhesive alone.
15
Can it wrap a column or a curved wall?
Columns, arched openings, curved reception desks and lift surrounds are ordinary work at a 200 mm radius or more. This is the one place the product beats stone outright: 30 mm stone cannot follow a curve at all, so the alternative is a specialist subcontract and a long lead time.
16
Can it go over existing tile, brick or render?
Yes, if the existing surface is sound, flat, clean and not about to fail. That is the renovation case the product was built for: no demolition, no skip, no strip-out, and the room stays usable. Test the old finish for adhesion first — a panel bonded to a loose tile is a panel that comes off with the tile.
04 Installation
Putting it on the wall
17
How is flexible stone installed?
Four steps. Clean, dry, flat substrate. Adhesive spread evenly across the back with a notched trowel. Press the sheet on while the adhesive is still open, adjust once, then leave it. Seal the edges and any joint that will see weather. There is no anchor, no rail and no cavity, which is why the wall behind matters more than the panel in front.
18
What adhesive should I use?
Standard construction adhesive or a polymer-modified tile adhesive, applied with a notched trowel so the whole back is covered. No specialist primer on a sound substrate. On a dusty, painted or sealed wall, sand or prime first — most callbacks trace back to the substrate, not the panel.
19
Can I cut it with a knife?
Score and snap for straight cuts. A fine-tooth saw or a grinder handles curves and tight openings. No wet saw, no dust extraction, no blade wear on mineral — on site that shows up as a faster programme and a cleaner handover. Cut outside the carton and keep the offcuts; they are the patch kit.
20
Does it need grout or movement joints?
No grout, and no movement joints on standard walls. Interior panels butt tight; exterior joints get a sealant that matches the face. The absence of grout lines is half the reason specifiers pick it over tile — the wall reads as one surface rather than a grid.
05 Cost & ordering
Price, samples and lead time
21
How much does flexible stone cost?
We quote by area and finish rather than publishing a list price, because freight moves the cost per square metre more than the panel does. What can be said plainly: a square metre of this weighs about one-thirteenth of 30 mm stone, so crating, shipping and site handling all drop sharply, and there is no anchor system to buy. Installation is adhesive and labour. Ask for a quote with the wall area and the market, and you will get a landed figure instead of a range.
22
Is there a minimum order quantity?
No minimum. Sample sets ship worldwide and production runs are priced by area. One caveat: single-style orders below 500 m² carry a plywood crate fee, because the export-grade crates are what keep the sheets flat and unbruised in transit.
23
Can I get a sample, and how long is the lead time?
Samples ship worldwide with the matching test reports attached, so the surface and the numbers arrive together. Stocked styles leave in about 14 days — most styles hold roughly 1,000 m². Custom colours and non-stock textures go into the production schedule, and the quote reply carries the exact date for your quantity.
06 Limits
Where it is the wrong material
24
What are the downsides of flexible stone?
Three worth knowing before you specify. The edge bruises — it is 3 mm of mineral, and a knocked corner shows at eye level, so handle and store it like glass. The pattern repeats every 1,200 mm, so on a long wall you plan the layout or you see the join. And it is not a membrane: 5.41% absorption means the wall behind it still has to do the waterproofing. It is also the wrong choice for floors, worktops and stair treads — 500 abrasion cycles cost the surface 0.0833 g (ASTM D1044), which is fine for a wall that gets brushed past and wrong for anything that takes foot traffic.
25
How long does flexible stone last?
The lab measures cycles, not years, so treat any lifespan figure with suspicion — including ours. Twenty freeze-thaw cycles and 500 abrasion cycles are the proxies we have. In service, what ends these panels early is a wet substrate and edge damage, not the material ageing.
26
Can it be repaired if it gets damaged?
Yes. Cut out the damaged area, bond a patch from the same batch, and the joint disappears into the texture. That is the practical reason to order 5–10% overage on any project — not waste, insurance. A different batch will not match, so keep the offcuts labelled.
Still not answered?
Send the wall, the market and the drawing. An engineer replies, not a bot — and if the answer is that this is the wrong product for your job, you will hear that too.