MC-Bauchemie Centripor SK 120-150
A chloride-free, precision-metered foaming concentrate that turns ordinary cement mortar into engineered, closed-cell foam concrete — repeatable density, batch after batch.
What is it?
A concentrated, chloride-free synthetic foaming agent supplied as a yellow-brown liquid. On its own it isn’t a foam — it has to be run through a mechanical foam generator (MC-Foam Generator II or III) where it’s diluted and whipped into a stable pre-foam, which is then folded into a pre-mixed cement slurry to produce foam concrete or insulating mortar.
Where is it used?
Roof and terrace insulation screeds, void filling of abandoned tanks/culverts/utility trenches, lightweight fill under flooring, precast lightweight block and panel units, polystyrene (EPS) bead concrete, and general trowel-applied insulation mortars.
Why use it?
It gives site teams a repeatable way to hit a target fresh density instead of guessing — the closed, stable pore structure resists collapsing or bleeding before the mortar sets, it’s chloride-free so it won’t threaten embedded rebar or buried pipework, and it improves the workability and homogeneity of the base mix.
How is it applied?
Dilute the concentrate with water and pump it through an MC-Foam Generator to produce a stable pre-foam of set density. Separately pre-mix cement, water, and any fine aggregate to a consistency toward the upper end of the F2 flow class, then fold the pre-foam into this slurry until fully homogeneous. Dosage is adjusted in grams per kilogram of cement to hit the target wet density — always via a trial batch first.
About MC-Bauchemie Centripor SK 120-150
Foam concrete has become a familiar sight on Indian rooftops and infrastructure sites over the last decade — that lightweight, air-cellular grey fill you see going down as a sloping insulation screed before waterproofing, or being pumped into an old tank to backfill it without excavation. What most site engineers don’t see is the foaming agent that makes it possible, and Centripor SK 120-150 is MC-Bauchemie’s entry in that category. It isn’t a bag of cement or a ready mix; it’s the concentrated liquid that a foam generator whips into a stable pre-foam, which then gets folded into an ordinary cement slurry to give you a controllable, engineered lightweight material instead of a lucky-dip mix.
What earns it a place on a technical data sheet rather than being sold as a generic “foaming liquid” is the paperwork behind it: it’s classified under EN 934-3 as a plasticising/air-entraining admixture for masonry mortar production (Type T2), independently checked by the Karlsruhe Institute of Technology’s materials-testing authority, and manufactured under ISO 9001 and EN 934-2/6 quality control. On the technical side it’s a low-viscosity, yellow-brown liquid with a density of 1.05 kg/dm³, dosed at roughly 0.1 to 5 grams per kilogram of cement depending on the target density of the finished mix, with chloride content held below 0.1% by mass — a detail that matters directly if you’re backfilling around reinforcement steel or buried services. For MC-Bauchemie’s India range, it’s listed and sold as “Centripor SK 120-150,” grouping the foaming-concentrate family that pairs with the brand’s MC-Foam Generator equipment for site or plant use.
The technical insight
Centripor SK 120-150 is classified under EN 934-3 as a plasticising/air-entraining admixture for masonry mortar production (Type T2), with third-party surveillance by the Karlsruhe Institute of Technology’s materials-testing body (MPA Karlsruhe, Notified Body 0754) and manufactured under ISO 9001 and EN 934-2/6 quality control. The concentrate carries a density of 1.05 kg/dm³, a recommended dosage window of roughly 0.1-5 g per kg of cement — the actual figure depends entirely on the target finished density of your mix — chloride content held below 0.1% by mass, and alkali content capped at 5.5% by mass, figures that matter directly if the foam concrete will sit near reinforcement, embedded services, or alkali-sensitive substrates. GISCODE BZM10 places it in the standard hazard-labelling class for building-chemical admixtures, which is routine for this product category and not a red flag.
Where it is used
- Lightweight foam concrete for terrace and roof thermal-insulation screeds
- Void filling of decommissioned tanks, culverts, and underground service voids
- Trench reinstatement after cable or pipeline laying
- Insulation and trowel-ready mortar production
- Filling and levelling grouts over uneven substrates
- Precast lightweight block and panel manufacture
- Polystyrene (EPS) bead lightweight concrete
- Non-structural fill for basement or pit backfilling
Key advantages
- Chloride-free formulation — safe for use around reinforcement steel and buried metal or plastic services
- Produces a stable, closed-cell foam that resists collapse or bleed-out before the mix sets
- Density is engineered, not guessed — dosage can be tuned to hit a specific target fresh density
- Improves workability and mix homogeneity of the base cement slurry
- Good water retention reduces early plastic-shrinkage cracking in the fresh mortar
- Designed to pair directly with MC-Foam Generator II/III for consistent, repeatable pre-foam quality
- Certified to EN 934-3 (T2) under independent third-party surveillance (KIT MPA Karlsruhe)
- Liquid concentrate is easy to dilute, meter, and dose accurately on site or at a batching plant
Limitations & considerations
- Not a structural concrete admixture — compressive strength falls sharply as density is reduced, so it has no place in load-bearing structural members
- Needs a dedicated mechanical foam generator and a trained operator; hand-dosing it straight into a mixer will not give reliable, repeatable results
- Achievable yield and pore stability are sensitive to water quality, cement fineness, and site temperature, so trial batches are essential before scaling to a full pour
- It is a foaming agent only — it does nothing for waterproofing, corrosion inhibition, or strength enhancement on its own
- As a specialised admixture rather than a mainstream plasticiser, India stock and lead times can run longer than commodity Conplast-type products
- The base mortar has to be conditioned to the right consistency (near upper F2) before foam is added — a mix that’s too stiff or too wet won’t take up foam evenly
Selection & best practice
Never scale straight from the TDS to a full pour — cast a small trial batch first, weigh a filled and levelled density cup or calibrated container to confirm actual wet density, and adjust dosage in grams per kilogram of cement rather than by volume, since foam yield varies with generator setting and water temperature. Pre-condition the base cement slurry to the specified consistency before folding in the pre-foam, and mix only long enough to homogenise — over-mixing breaks down the pore structure. In Indian site conditions, hot ambient temperatures and direct sun accelerate water loss from freshly placed foam concrete, so protect it with light curing (damp hessian or curing compound) for at least the first 24-48 hours, and keep the concentrate itself stored sealed in its original container, away from direct sun and freezing, until use.
Specifications
| Product type | Concentrated synthetic foaming agent (EN 934-3 admixture) for foam concrete / insulation mortar |
| Appearance | Yellow-brown liquid |
| Density (concentrate) | 1.05 kg/dm³ |
| Recommended dosage | 0.1-5 g per kg of cement (mix-design dependent) |
| Chloride content (max) | < 0.1% by mass |
| Alkali content (max) | < 5.5% by mass |
| Standard compliance | EN 934-3: T2 — plasticising/air-entraining admixture for masonry mortar production |
| Quality assurance | ISO 9001 & EN 934-2/6 production control; third-party surveillance by KIT — MPA Karlsruhe (Notified Body 0754) |
| Hazard classification | GISCODE BZM10 |
Industry use cases
Roofing & terrace waterproofing packages
Used as the sloping insulation-cum-screed layer over RCC roof slabs, ahead of the waterproofing membrane, to cut dead load and improve thermal performance.
Utility & infrastructure contractors
Foamed into low-strength mortar to backfill decommissioned tanks, culverts, and trenches after cable or pipeline work — flowable, self-levelling, and won’t corrode adjacent metalwork.
Precast & block manufacturing units
Batched into lightweight block and panel mixes where a controlled, repeatable density is needed to hit both weight and insulation targets.
General building contractors
Used for insulation mortars over metal decking or EPS-core panel systems, and for levelling layers under flooring where dead-load reduction matters.
Basement & pit reinstatement
Provides a pumpable, self-compacting non-structural fill for old basements, sumps, or pits being decommissioned, without the settlement risk of loose granular fill.
Frequently asked questions
Is this the same kind of admixture as the plasticisers we already dose into RMC?
What finished density can we achieve with this product?
Do we need special equipment to use it?
Will it corrode reinforcement or buried pipework if used for trench backfill?
What’s the shelf life and how should we store it?
What pack sizes and pricing does Space Arc offer?
How we position MC-Bauchemie Centripor SK 120-150
Centripor SK 120-150 sits within MC-Bauchemie’s Centripor foaming-agent range and is designed to be paired specifically with the brand’s own MC-Foam Generator II/III equipment — if you’re sourcing the concentrate from Space Arc, it’s worth sourcing (or confirming compatibility of) the foam generator from the same family to get the pore stability the TDS promises. It is not a substitute for MC-Bauchemie’s structural admixture lines (superplasticisers, retarders, and the like) used in normal RMC or precast concrete — those are separate product families for a separate job. For specifiers who want a well-established Indian-market alternative for the same foam-concrete application, Fosroc’s Conplast F292 is a genuine functional equivalent: a concentrated surfactant foaming agent run through a Fosroc Foam Generator to produce foamed mortar for void filling, trench reinstatement, and lightweight screeds. A specifier already standardised on Fosroc’s foam-generator hardware, or working on a project where Fosroc is the approved brand, would reasonably choose Conplast F292 over Centripor SK 120-150; where MC-Bauchemie is the approved system brand or the project already uses MC admixtures elsewhere, Centripor SK 120-150 is the natural fit.
Fosroc Conplast F292 — A specifier already standardised on Fosroc’s foam-generator equipment, or working on a project where Fosroc is the approved admixture brand, would reasonably choose Conplast F292 over Centripor SK 120-150 for the same foam-concrete application.
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