Understanding of Modified Clay Material (MCM) - Flexible/soft stone
MCM flexible/soft stone is a thin, lightweight mineral-based architectural surface engineered to reproduce the texture, depth and visual character of natural materials such as travertine, limestone, sandstone, brick, concrete, rammed earth and wood, while remaining flexible enough to bend around architectural forms and light enough to be installed with comparatively simple cladding systems.
It’s worth mentioning that there is another product category in the market sometimes called “flexible stone veneer” - a very thin layer of actual slate peeled from natural stone and bonded to resin backing. It falls into different product categories with distinctive product nature.
What MCM soft stone actually is
Conceptually, MCM soft stone sits somewhere between stone cladding, ceramic tile and architectural wallcovering. It contains a high proportion of natural mineral material - taking ingredients such as soil, stone offcuts, waste brick, ceramic material and sand, but unlike porcelain it is not vitrified in a high-temperature kiln. Instead, all the raw materials are modified with a relatively small binder/modifier system, then moulded and cured at much lower temperatures (around 90℃). This production process fundamentally changes the behaviour of the finished product: traditional ceramic firing converts clay into a hard, rigid body. Soft stone deliberately avoids that degree of vitrification, so the finished surface remains thin and has controlled flexibility.
So put it in simple, think of soft stone as: an engineered mineral surface rather than imitation plastic stone. This distinction matters architecturally because the objective is to retain the mineral tactility, matt finish, irregularity and depth associated with stone while removing much of the weight and rigidity.
The manufacturing process break down
1, Mineral raw materials are collected and selected. These can include clay, sand, stone powder, mineral tailings, stone-processing waste, recycled brick and ceramic residues.
2, ‘Micro-powder processing’ stage. The materials are crushed and refined into controlled micro-powders. Particle size and mineral composition matter because they affect texture, strength, colour and forming behaviour.
3, The mineral powder is modified. Water-based polymer modifiers/binders and other functional additives are introduced so the mineral body can hold together without conventional high-temperature ceramic vitrification. This is where the term Modified Clay Material (MCM) comes from.
4, Colour and mineral character are introduced. Colour may come from mineral pigments, the mineral body's inherent colour, printed layers, or a combination. Modern systems increasingly use digital or 3D printing to create more natural tonal variation.
5, The material is pressed against textured moulds. This is the stage that produces travertine pores, split stone, chiselled ridges, timber grain, rammed-earth layers, brick faces and all other textures.
6, The sheet undergoes low-temperature curing, activation, cross-linking. The material is formed at approximately 90°C. This is dramatically below traditional ceramic firing temperatures.
7, Surface finishing, printing and protection are applied as required. Depending on the surface profile, manufacturer now adds high-resolution colour, surface treatment, UV/weather resistance treatment or functional coatings at this stage.
8, Stone panels are trimmed, inspected and packed. The finished product may be a very thin flat sheet or a thicker deeply textured panel.
WRITTEN BY LANTERN SPACE