MC-Bauchemie Centripor SK 106
A chloride-free liquid foam concentrate that turns ordinary cement mortar into lightweight, insulating foamed concrete, dosed through MC-Bauchemie’s MC-Foam Generator II for consistent, stable density on site.
What is it?
A liquid foam concentrate, whipped into a stable, fine-pored foam and blended into cement mortar to make lightweight, cellular foamed concrete.
Where is it used?
Sloped roof insulation screeds, void and trench backfilling, insulation renders, filling and levelling grouts, and lightweight block or polystyrene-concrete manufacture.
Why use it?
Cuts dead load and improves insulation versus normal-density concrete, is chloride-free so it adds no corrosion risk near reinforcement, and lets one concentrate dial density up or down to suit the job.
How is it applied?
Whipped into stable foam using the MC-Foam Generator II (direct dosing possible for specific applications), then folded into a premixed mortar or grout at an upper-F2 consistency, roughly 40 cm flow spread, until evenly distributed.
About MC-Bauchemie Centripor SK 106
Centripor SK 106 is MC-Bauchemie’s foam concentrate for the foamed-concrete and insulation-mortar segment of its admixtures range, a liquid, chloride-free additive that turns normal cement mortar into a stable, air-entrained, low-density mix. In Indian construction it is behind sloped terrace insulation screeds that fall correctly to the outlet without overloading the RCC slab beneath, void fills for disused tanks and ducts on redevelopment sites, and lightweight cellular blocks used to cut dead load in high-rise partition work. It sits in MC-Bauchemie’s dedicated foaming-agents family alongside siblings such as Centripor SK 120, so specifiers on one Centripor grade have a known route to a different dosage or foam-stability profile without switching brands.
What separates a foam concentrate from a plain air-entrainer is control. Centripor SK 106 is normally whipped into foam through the purpose-built MC-Foam Generator II, producing foam stable enough to survive being folded into pre-mixed mortar without collapsing; direct dosing is possible but flagged for specific applications rather than the default route. Because resulting density is governed almost entirely by how much foam goes in, one concentrate can be dosed light for maximum insulation or heavier for a firmer screed, and the data sheet is explicit that lower specific gravity buys better insulation at the cost of compressive strength. That lever, plus an EN 934-3: T2 classification and Notified Body oversight from KIT-MPA Karlsruhe, is why it gets specified for engineered insulation systems as much as straightforward void-filling.
The technical insight
The data sheet classes Centripor SK 106 as an air-entraining agent / concrete plasticiser for masonry-mortar production under EN 934-3: T2, with a recommended dosage of 0.1 to 5 g per kg of cement and a concentrate density of 1.05 ± 0.02 kg/dm³, a wide band because foamed concrete is a family of mixes ranging from dense, load-tolerant screeds to very light, highly insulating fills. Chloride content is capped under 0.1% and alkaline content under 5.0% (both mass fraction), keeping it usable in reinforced work without chloride-related durability caveats. The manufacturer’s own advice matters: base mortar should sit at an upper-F2 consistency, roughly 40 cm flow spread, before foam goes in, since a stiff mix won’t take foam evenly and a fluid one risks collapse and density drift, which is why a wet-density check and trial cubes should fix the final mix.
Where it is used
- Foamed (cellular lightweight) concrete for sloped roof insulation screeds
- Insulation mortar and trowel-applied insulating renders
- Void filling of disused tanks, ducts, culverts and abandoned pipelines
- Filling and levelling grouts under floors or behind panels
- Lightweight block, panel and polystyrene (EPS) concrete manufacture
- Utility trench reinstatement with self-levelling, low-density backfill
- Lightweight partition concrete in high-rise construction
- Thermal and acoustic insulation over ageing roof decks in retrofit work
Key advantages
- Chloride-free, so no added corrosion risk near reinforcement
- Stable, fine, uniform pore structure gives consistent batch-to-batch density
- Mix density adjustable simply by varying the amount of foam dosed
- Improves workability and homogeneity of the base mortar or concrete
- Good water retention helps limit early plastic shrinkage
- EN 934-3: T2 certified, made under EN ISO 9001 / EN 934-2/6 with Notified Body oversight
- Works via the MC-Foam Generator II for volume consistency, or direct dosing for specific jobs
- Liquid concentrate is easy to store, meter and handle on site
Limitations & considerations
- Best results depend on the MC-Foam Generator II; direct dosing suits smaller, specific applications and needs closer operator control
- Foamed concrete trades strength for density, so the mix must be trial-tested against the actual target, not assumed from the dosage range
- It is an insulation, void-fill and lightweight-fill material, not a structural substitute, and is not intended for load-bearing elements
- The data sheet is written to EN 934-3 with no quoted IS/BIS equivalence, so mix designs should be validated locally against Indian codes
- Foam stability and final density are sensitive to temperature, mixing time and base-mortar consistency, making site trials essential
- The dosage window is wide (0.1 to 5 g per kg cement); skipping a trial batch can leave poured density off target
Selection & best practice
Run a trial batch before any full-scale pour: calibrate the MC-Foam Generator II output, keep the base mortar at an upper-F2 consistency (about 40 cm flow spread) so it takes foam evenly, and weigh dosage rather than estimating by volume. Check wet density right after mixing with a known-volume container, and cast trial cubes to confirm the density-to-strength relationship for the actual use before fixing the mix design. Store the concentrate away from frost and direct heat, and keep placement conditions close to the 21°C ± 2°C, 50% relative humidity the manufacturer’s lab values assume, wherever practical.
Specifications
| Product type | Foam concentrate / air-entraining admixture, EN 934-3: T2 |
| Form | Liquid |
| Colour | Yellowish brown |
| Density | 1.05 ± 0.02 kg/dm³ |
| Recommended dosage | 0.1–5 g per kg of cement |
| Chloride content (max) | < 0.1% (mass fraction) |
| Alkaline content (max) | < 5.0% (mass fraction) |
| Pack sizes | 30 kg canister; 200 kg drum |
| Quality / compliance | EN ISO 9001, EN 934-2/6; Notified Body KIT-MPA Karlsruhe (0754); GISCODE BZM10 |
Industry use cases
Residential and commercial roofing
Sloped terrace insulation screeds that fall correctly to the outlet with minimal added dead load on the RCC slab, a common Delhi NCR terrace package.
Infrastructure and utilities
Void filling of abandoned service ducts, basements or disused tanks and pipelines during metro corridor and road-widening works.
Precast and block manufacturing
Lightweight cellular concrete blocks and panels for partition walls, cutting dead load versus solid block.
Utility and sub-base works
Trench reinstatement after underground utility works, where self-levelling, low-density backfill limits later settlement.
Renovation and retrofit
Insulating trowel-applied mortar over ageing roof decks for a thermal upgrade without a major structural review.
Frequently asked questions
What does Centripor SK 106 actually do in a mix?
Is it safe near reinforcement steel?
Can I dose it by hand, or do I need the foam generator?
How do I decide how much foam to add?
What pack sizes does Space Arc supply?
Is there a comparable Fosroc product?
How we position MC-Bauchemie Centripor SK 106
Centripor SK 106 belongs to MC-Bauchemie’s dedicated foaming-agents family; projects already running Centripor SK 120 or the fresh-mortar additive Centripor-Murapor can standardise on Centripor across their lightweight-concrete needs. Space Arc supplies it alongside the same MC-Bauchemie admixtures range used for structural concrete elsewhere on a project, useful when a specifier wants one accountable brand across structural and insulation scopes. Fosroc’s standard Indian admixture catalogue carries no comparable dedicated foam concentrate, so a single-brand Fosroc programme would typically need a specialist foaming agent sourced separately, which is where Centripor SK 106 remains the more direct fit.
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