About MC-Bauchemie MC-Floor Screed 25

MC-Floor Screed 25 is the workhorse binder in MC-Bauchemie’s weekend industrial-floor repair system, sitting alongside the MC-Floor Screed BS bond coat and the self-levelling MC-Floor Screed 10 topping. Where Screed 10 is built for thin, self-flowing overlays of 10-30mm, Screed 25 is the trowel-and-screed-applied member of the family, designed to be gauged with ordinary 0-8mm building sand and hand- or machine-finished into layers from 25mm up to about 70mm in a single pass. That makes it the product a site team reaches for when a genuine chunk of an industrial floor – not just its surface – has broken up: spalled dock aprons, screed that has delaminated around embedded rails or foundations, or bays gouged out by years of forklift and pallet-truck traffic. For Indian factories and warehouses, where a production line standing idle costs far more than the material itself, the appeal is less about the chemistry and more about the calendar: cut, prime, relay and reopen the bay before the next shift.

Underneath that promise is a genuinely fast-reacting special cement, low in chromate and free of chlorides, so it is safe to place directly against reinforcement and doesn’t carry the handling cautions of older rapid-set systems. Mixed to the earth-damp consistency called for in the datasheet, it develops compressive strength past 36 N/mm² within 72 hours and beyond 55 N/mm² at 28 days, with flexural strength climbing past 7 N/mm² over the same period – comfortably inside the CT-C50-F7-A9 bracket of EN 13813, the European standard specifiers use to classify bonded cement screeds. Shrinkage is held to a modest 0.11mm/m at 28 days, which matters more than it sounds: a screed that shrinks unevenly against an old substrate is a screed that debonds or cracks along the repair line within a season, undoing the whole point of a fast repair.

The technical insight

The speed comes from cement chemistry, not from added accelerators dosed on site – MC-Floor Screed 25 is a factory-blended special binder engineered for rapid early hydration, which is why it can be smoothed in roughly 4 hours yet still needs a full 45-minute-or-so working window to place before that reaction takes hold. The tight water/cement ratio (0.4 maximum) that the datasheet insists on is doing double duty: it’s what gets the mortar to >36 N/mm² by 72 hours, and it’s what keeps residual moisture under the 4 CM% ceiling MC-Bauchemie sets before a resin coating can go over the top at 48 hours. Push more water in for easier troweling and both numbers slip – the floor stays wet longer and the epoxy or PU system applied on schedule is the one that blisters. The system’s other quiet detail is the dedicated MC-Floor Screed BS bond coat: it has to be applied fresh-in-fresh, in a quantity that can be covered within 30 minutes, because the mechanical bond between old and new screed is what the whole rapid-turnaround claim depends on – skip it or let it skin over and you have a fast-setting mortar sitting unbonded on top of the old floor.

Where it is used

• Rebuilding worn, spalled or delaminated sections of RCC industrial floor slabs in factories and warehouses
• Fast-track weekend repair of forklift and pallet-truck traffic lanes without stopping production for a full shutdown
• Reinstating screed after floor-mounted machinery, racking or foundations are removed or relocated
• Levelling and building up worn or low areas ahead of epoxy or PU resin flooring systems
• Rapid screed repair in cold-storage and food-processing units where downtime windows are short
• Screed laid on a separating/isolation layer where the existing base cannot be bonded to directly
• Loading bay aprons and dock-leveller approach ramps subject to constant wheel traffic
• Localised patch repair of impact-damaged or chemically attacked industrial floor areas

Key advantages

• Smoothable in around 4 hours, so trades can walk the bay and keep working the same day
• Overcoatable with resin flooring systems in 48 hours against weeks for a conventional screed
• High early and late strength (>36 N/mm² at 72h, >55 N/mm² at 28d) suited to forklift-trafficked floors
• Low shrinkage (0.11mm/m at 28 days) reduces the cracking and debonding risk that plagues fast repairs
• Chloride-free, low-chromate formulation (GISCODE ZP1) is safer to handle and place near reinforcement
• Verifiable EN 13813 CT-C50-F7-A9 classification gives consultants a standard to specify and check against
• A matched system – dedicated MC-Floor Screed BS bond coat removes the guesswork of picking a compatible primer
• Backed by MC-Bauchemie’s technical documentation and Space Arc’s on-ground application experience in NCR

Limitations & considerations

• Minimum layer thickness of 25mm rules it out for thin overlays or feather-edge repairs – use MC-Floor Screed 10 for 10-30mm work instead
• A working time of only about 45 minutes at 20°C demands a trained crew and mechanical mixing on site; this is not a DIY patching compound
• Depends on correct substrate preparation and the matching MC-Floor Screed BS bond coat for adhesion – it is not designed to be used standalone
• Needs curing protection (waterproof sheeting for the first 12 hours) – hot, windy Indian sites in summer need real curing discipline or the fast-set advantage is lost to premature drying
• A specialty imported binder priced above ordinary PCC or screed repair mortar, best justified where the cost of downtime outweighs the material premium
• As a distributor-stocked specialty cement, pack availability and lead time should be confirmed before locking in a weekend shutdown window

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Floor Screed 25

MC-Floor Screed 25 is best specified as part of its own system rather than in isolation – always with the MC-Floor Screed BS bond coat, and alongside MC-Floor Screed 10 where a project needs both a thick structural patch and a thinner self-levelling finish in different zones of the same floor. Space Arc stocks and applies the full MC-Floor Screed range together for this reason. Against the wider market, Fosroc’s rapid-strength repair mortars (the Renderoc and Patchroc ranges) cover adjacent ground – fast trafficable strength gain for concrete patch repair – but they are formulated and marketed as structural/vertical repair mortars rather than as a sand-gauged, trowel-applied industrial screed system with a matched bond coat, so there isn’t a like-for-like Fosroc screed product to name here; a specifier choosing between the two is really choosing between a full MC-Bauchemie screed rehabilitation system and a Fosroc structural-repair-plus-separate-flooring-topping approach assembled from different product lines.

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