MC-Bauchemie MC-RIM PW 101
A DVGW-tested mineral coating built for one job: keeping RCC reservoirs, water-treatment tanks and drinking-water infrastructure structurally sound and hygienically clean, layer after layer.
What is it?
MC-RIM PW 101 is a single-component, cement-bound mineral coating built on MC-Bauchemie’s DySC technology. It’s mixed with nothing but water and applied in two to three passes by hand or wet-spray to build a dense, low-porosity barrier directly on concrete.
Where is it used?
Internal wall and overhead (soffit) surfaces of drinking water reservoirs, clear-water and clarified-water tanks at treatment plants, and RCC structures inside notified drinking-water protection zones – on both new-build work and rehabilitation of ageing tanks.
Why use it?
It’s tested and approved to DVGW leaflet W347 Type 2, meets DVGW W270 and W300-5(A), and carries ÖVGW certification with external monitoring – the reference points consultants ask for when a coating will permanently touch potable water. It’s also rated EN 1504-3 Class R4, so it performs like a structural repair mortar, not a thin decorative seal.
How is it applied?
Powder goes into water at a fixed 100:13-14 ratio (roughly 3.25-3.5 litres per 25kg bag) in a forced or double mixer – mixing by hand isn’t permitted. It’s built up in 2-3 layers of 8-15mm each, the first worked in as a scratch coat, trowel-finished and sponge-rubbed on the last pass, then cured at 85-95% relative humidity for three times the normal DIN 1045-3 period.
About MC-Bauchemie MC-RIM PW 101
Coatings that touch drinking water sit in a narrow, compliance-heavy category of their own. It isn’t enough for a lining to keep water out or in – it also has to not leach anything, not feed microbial growth, and survive years of fill/empty cycling, chlorination and variable water chemistry without breaking down. MC-RIM PW 101 was built specifically for that brief. It’s a rigid, non-crack-bridging mineral coating – meaning it’s engineered for sound RCC water-retaining structures where movement is controlled through proper joints, not for substrates expected to keep cracking under it. In exchange for that constraint it delivers genuine structural-mortar performance: EN 1504-3 Class R4, compressive strength of 45 N/mm² or higher at 28 days, and a water penetration depth of just 1mm at 5 bar – while staying open to vapour diffusion so trapped moisture doesn’t build up and blister the surface when a tank is drained for inspection.
For the Indian market, that lands squarely on municipal ESR/GSR/UGR reservoirs, WTP clear-water and clarified-water tanks, and industrial captive water-treatment structures – the kind of assets where an ordinary waterproofing coating simply isn’t specified to touch potable water, and where a consultant will ask for DVGW- or equivalent-referenced documentation before sign-off. Space Arc supplies and applies MC-RIM PW 101 as an authorised MC-Bauchemie distributor across Delhi NCR and pan-India, and we’d flag this upfront: the product’s tolerances are tight by design – fixed mixing ratio, mandatory machine mixing, a defined working-time window, and an actively maintained high-humidity curing regime – so it rewards being installed by a trained crew rather than treated as an off-the-shelf paint-on coating.
The technical insight
The “rigid, non-crack-bridging” classification is the detail specifiers most often skip past, and it’s the one that matters most on site. MC-RIM PW 101 is certified under EN 1504-3 for both principle 3 (structural restoration) and principle 7 (preserving/restoring passivity against ingress), procedures 3.1, 3.3 and 7.1. That combination means it does two jobs at once: rebuilding surface profile and strength on a repaired substrate, and forming a low-permeability, chemically resistant skin over it. What it isn’t doing is bridging live cracks – if the underlying RCC has structural movement, that needs to be resolved with joint detailing or a flexible system before MC-RIM PW 101 goes on, not covered over by it. On the drinking-water side, DVGW W347 Type 2 testing and W270/W300-5(A) compliance are German technical-standard references rather than an Indian statutory approval, so on regulated municipal contracts we recommend treating them as strong supporting documentation and getting explicit sign-off from the client’s own water authority or consulting engineer, rather than assuming automatic acceptance.
Where it is used
- Elevated (ESR) and ground-level (GSR) service reservoirs for municipal water supply
- Underground water storage reservoirs (UGRs) and clear-water sumps at treatment plants
- Clarified/clear-water tanks and RCC process chambers inside water treatment plants (WTPs)
- RCC concrete structures within notified drinking-water catchment/protection zones
- Rehabilitation of ageing reservoirs showing leaching, honeycombing or carbonation before recommissioning
- New-build RCC water-retaining structures where a hygienic internal lining is specified at design stage
- Industrial captive water-treatment tanks in food, beverage and pharma facilities
- Wall and soffit (overhead) surface protection inside enclosed potable-water structures
Key advantages
- DVGW W347 Type 2 tested and W270/W300-5(A) compliant – built specifically not to leach substances into stored drinking water
- EN 1504-3 Class R4 rated – compressive strength ≥45 N/mm² and flexural strength ≥6.5 N/mm² at 28 days, so it structurally reinforces the substrate rather than just sealing it
- Water penetration of just 1mm at 5 bar, yet stays open to vapour diffusion – won’t trap moisture and blister when a tank is drained
- Highly resistant to chlorides and sulphates, relevant given how variable raw and ground water chemistry can be across Indian sites
- Cement-based, single-component system mixed only with water – simpler site QC than two-pack epoxy or PU systems, with no solvent/VOC handling
- Documented coverage rate (1.9 kg/m²/mm) makes BOQ quantity estimation straightforward
- ÖVGW-certified with external, third-party monitoring standing behind the manufacturer’s own quality claims
Limitations & considerations
- Rigid and non-crack-bridging – not suitable where the substrate has active or moving cracks; those need joint treatment or a flexible system first
- Application window is tight: air, substrate and material must all sit between 5°C and 30°C, which needs planning around peak summer surface temperatures
- Curing is demanding, not optional – 85-95% relative humidity has to be actively maintained (humidifiers, not just wet hessian) for three times the standard DIN 1045-3 period, and it’s the step site teams most often shortcut
- Minimum 8mm per pass means it’s a genuine coating build-up, not a thin skim – expect 2-3 work steps and more programme time than a roll-on liquid coating
- Comes only in 25kg bags with no small touch-up pack, so wastage needs planning on small repair jobs
Selection & best practice
Treat substrate prep as non-negotiable – follow MC-Bauchemie’s General Application Advice for Fine Fillers, and confirm the concrete is sound, laitance-free and in a saturated surface-dry condition before the first pass. Batch strictly to the 100:13-14 powder-to-water ratio in a forced or double mixer for a full 5 minutes minimum; hand-mixing or splitting partial batches isn’t permitted. Work the first layer in hard as a scratch coat rather than laying it over the surface, leave the second layer spray-rough if you’re doing a three-pass build, and pre-smooth the final layer with a steel trowel before sponge-finishing it for density and impermeability. Respect the overcoating windows – about 30 minutes between the first and second layer, then either within 4 hours or after at least 16 hours between the second and third. The moment finishing is done, start curing: 85-95% relative humidity, sustained with air humidifiers, for three times the DIN 1045-3 period – this is where reservoir linings most often fail early, not in the material itself. Keep movement and construction joints out of scope for this coating; they need to be detailed and treated separately with a flexible joint system, not coated over rigidly.
Specifications
| System / chemistry | Cement-bound mineral coating (DySC-technology), single-component, mixed with water only |
| Mixing ratio | 100 : 13–14 (powder : water, by weight); ≈3.25–3.50 L water per 25 kg bag |
| Coverage / consumption | 1.9 kg/m² per mm of layer thickness (factory-dried mortar) |
| Layer thickness | 8–15 mm per pass; 15 mm max total (may exceed locally by 25% on areas ≤5 m²) |
| Compressive strength (28 d) | ≥45 N/mm² |
| Flexural strength (28 d) | ≥6.5 N/mm² |
| Water penetration depth | 1 mm at 5 bar gauge pressure (EN 12390-8, 28-day test age) |
| Standards / approvals | EN 1504-3 Class R4 (principles 3 & 7, procedures 3.1/3.3/7.1); DVGW W347 Type 2, W270, W300-5(A); ÖVGW certified |
| Pack size / shelf life | 25 kg bag; 12 months in cool, dry, unopened storage |
Industry use cases
Municipal water utilities
Rehabilitating leaching or honeycombed ESR/GSR/UGR reservoirs so they can be recommissioned for potable supply
Water treatment plants
Lining clear-water and clarified-water tanks and RCC process chambers within the treatment train
Industrial captive water treatment
Protecting concrete process-water tanks in food, beverage and pharma plants where hygiene sign-off is required
PHED / state water board infrastructure
Refurbishing overhead and underground tanks under municipal supply-upgrade programmes
New-build reservoir construction
Specified at design stage by consulting engineers as the internal lining for new RCC water-retaining structures
Frequently asked questions
Is MC-RIM PW 101 actually safe for stored drinking water, or is that just marketing language?
Can it bridge cracks in an old reservoir wall?
How much do we need for a typical reservoir job?
Does it need a primer before application?
How is this different from a normal waterproofing coating we’d use on a terrace or basement?
Can our regular painting contractor apply it, or does it need a specialist crew?
How we position MC-Bauchemie MC-RIM PW 101
Within MC-Bauchemie’s own range, MC-RIM PW 101 sits in the rigid, non-crack-bridging bracket of the company’s DySC-technology surface-protection coatings, alongside the firm’s broader family of mineral repair mortars and waterproofing systems that Space Arc carries for RCC rehabilitation work generally – useful context if a reservoir job needs structural patch repair before this coating goes on, not just the coating itself. Where a project genuinely needs crack-bridging flexibility instead of a rigid mineral build – say, a tank with a documented history of movement – Fosroc’s Nitocote CM210, a two-component elastomeric cementitious coating approved for potable water contact, is a realistic alternative we also stock, and specifiers should choose between the two on that movement question rather than on brand alone.
Fosroc Nitocote CM210 — Specifiers who need crack-bridging flexibility from a two-component elastomeric cementitious coating – rather than MC-RIM PW 101’s rigid, DVGW-referenced mineral build – often turn to Nitocote CM210 instead, typically on tanks with a documented history of movement.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.