2.5L
Covers
70–110 sq ft
2 coats, absorbent mineral
Best For
Single feature wall, damp room, or accent area.
SILICATE INTERIOR WALL PAINT · ART. 690
The silicate wall paint that bonds into the plaster — and keeps it breathing.
LEINOS 690 — a dispersion-silicate interior wall paint. Potassium water-glass fuses chemically with the mineral wall (silicification), not a film on top. Highly vapour-permeable (Sd ≈ 0.01 m); its alkaline surface (pH ≈ 11) prevents mould without biocides; scrub-resistant Class 2. For heritage conservation and modern mineral architecture. Made in Germany by Reincke Naturfarben since 1985.
Silicification bondHighly vapour-permeable (Sd ≈ 0.01 m)Mould-preventing · no biocideScrub-resistant Class 2
Mechanism & Use
How 690 silicate paint works.
Potassium water-glass reacts with the silicates already in the mineral wall — the paint becomes part of the substrate, stays vapour-open, and denies mould a foothold. A mineral layer, not a polymer film.
01
Silicification fuses the paint into the wall
Potassium water-glass (potassium silicate) reacts with the silicates in lime plaster, cement, and mineral render — chemical bonding, not adhesion. As the water leaves, what remains is a silicate network continuous with the wall itself. The coat becomes a mineral layer of the wall, not a film on top of it.
02
Extremely vapour-permeable — Sd ≈ 0.01 m
The cured silicate layer is open-pore. Water vapour passes freely in both directions — monsoon humidity absorbed and released seasonally, no trapped film, no bubbling, no delamination. The wall behaves as a mineral wall should.
03
Mould-preventing alkaline surface — no biocide
Alkaline pH approx. 11 plus silicification leave no organic food source for mould, algae, or fungi. The protection is the chemistry of the coat itself — not a leaching biocide additive that washes out over time.
04
Mineral matt finish, scrub-resistant Class 2
A deep, non-reflective mineral natural-white that reads flat under interior light. Wet-scrub resistant to DIN EN 13300 Class 2 and washfast — durable enough for kitchens, corridors, and high-traffic interiors.
Where It Lives
Where 690 Lives
Rajasthani & Lucknow heritage interiors
Jaipur, Udaipur, Jodhpur, Lucknow heritage residences and hotels. Original lime-plastered walls that reject modern emulsion films. 690 fuses into the wall’s own mineral matrix by silicification — conservation-grade, breathable, and always recoatable.
Modern mineral-architecture interiors
Cement- and lime-plastered contemporary homes and studios (Studio-Lotus / AD-India register). A deep matt mineral white with a chemically bonded, biocide-free surface — the texture and depth conventional emulsion cannot produce.
Coastal-humidity damp rooms, kitchens & bathrooms
Mumbai, Goa, Kochi, Chennai. Where standard emulsion bubbles and peels under steam and monsoon humidity, the vapour-open silicate coat (Sd ≈ 0.01 m) and its mould-preventing alkaline surface handle the wall stress — and its Class 2 scrub resistance takes wiping down.
Wellness studios, ayurvedic spas, yoga shalas
Health-led interiors where solvent-free, breathable, biocide-free mineral coatings are part of the air-quality story. No off-gassing, no leaching additive, and no plastic film between occupant and substrate.
High-traffic corridors, stairwells & hospitality
Hotels, clinics, schools, and offices where walls are wiped often. The scrub-resistant Class 2 mineral surface stays washfast and matt, while the silicification bond resists the flaking that defeats softer heritage limewashes.
Restored heritage hotels, museums & conservation interiors
Where the specification requires traditional mineral materials with documented German manufacturing rigour. LEINOS as the bridge between Indian heritage craft and EU compliance documentation.
Compliance · Natural Ingredients · EU
Documented silicate chemistry. No film-forming polymers, no biocides.
Three anchors that let architects specify 690 for heritage-conservation and modern mineral projects without disclaimers.
EU Compliance
VOC 1 g/l
EU limit 30 g/l · Cat. a interior matt walls (water-borne) · Directive 2004/42/EC.
Institutional Pledge
InVeNa Member
Reincke Naturfarben — full-ingredient-disclosure pledge for natural building products.
The TDS is downloadable below. Where you need a written specification packet — full ingredient declaration, VOC compliance letter for an architect’s submittal, or a silicate-system compatibility statement for a heritage-conservation project — it is available to architects and contractors on request. The safety data sheet is supplied on request. Use Get Expert Advice above.
Read The Full TDSStep by Step
How to Apply
Substrate + primer. The wall must be dry, sound, load-bearing, and clean. Prime raw plaster, gypsum plaster, and gypsum board with LEINOS 621 Silicate Primer; also prime patchy or repaired areas so absorbency is even. Test substrates with water-soluble, discolouring content by misting a small area first. Note: on smooth substrates the primer leaves a slightly grainy texture — this is expected.
Stir thoroughly and sieve. Silicate paint settles in the pail — stir the LEINOS 690 tin well and sieve the paint to remove any dried skin from the rim or lid before use. This is a material-typical step for silicate paints and gives an even, blemish-free coat.
First coat — brush, roller, or airless. Apply the first coat evenly by brush, roller, or airless spray; it may be diluted with up to 10% water if needed. For airless, work at approx. 100 bar with a 0.25 mm nozzle, no gun filter, 50° spray angle, and sieve the paint first. Work in overlapping strokes so the silicate penetrates uniformly.
Final coat — undiluted, after approx. 4 hours. Once the first coat is dust-dry (about 3 hours) and recoatable (about 4 hours) at 20°C / 50% RH, apply the final coat undiluted. Two coats bring the wall to uniform matt mineral opacity. Ensure good ventilation throughout.
Optional glaze / on-site tint. After 24 hours of full cure the wall can be decorated with a translucent glaze: thin LEINOS 621 Silicate Primer with water 1:3 to 1:5 and add the alkali-resistant LEINOS 668 Pigment Concentrate. For a solid custom colour, tint the paint on site with 668. Only alkali-resistant pigments survive the silicate chemistry.
Cured mineral finish + cleaning. The finished wall is a deep matt mineral natural-white, scrub-resistant and washfast. Clean tools immediately with water and LEINOS 930 Plant Soap. The alkaline paint is only a hazard while wet — the cured mineral surface is inert.
Application Conditions
- Ambient and surface temperature above 5°C; substrate fully dry.
- Product is alkaline — mask and protect glass, natural stone, aluminium, wood, and lacquered surfaces; wash any splashes off immediately with plenty of water.
- Ensure good ventilation during application and the first 24 hours of cure.
- On smooth substrates the 621 primer leaves a slightly grainy texture — this is expected.
Coats & Recoating
- 2 coats (first coat may be diluted up to 10% with water; final coat undiluted).
- Recoatable after approx. 4 hours (at 20°C / 50% RH).
Cleaning & Storage
- Clean tools immediately with water; LEINOS Plant Soap 930 for hardened residues. Do not use solvents.
- Store cool, dry, sealed, and frost-free. Shelf life (unopened): at least 12 months. Opened or diluted material is not storable.
Airless Spray
Nozzle: 0.25 mm. Gun filter: none. Working pressure: approx. 100 bar. Spray angle: 50°. Sieve the paint before spraying.
First time with Silicate Paint? Our technical team runs complimentary on-site walkthroughs for contractors — full application protocol, start to finish.
System & Substrates
The silicate topcoat for interior mineral walls.
Two coats of 690 over sound mineral plaster — with 621 Silicate Primer first on raw plaster, gypsum, or patchy absorbency. Silicate paint behaves as a chemically continuous mineral layer, not a coating film.
The Coating System
Primer plus topcoat — the full chain.
Silicate Paint Topcoat690Silicate Paint
Tinting On Site
Mix your own custom shade at the site with LEINOS pigments.
Substrate Fit
690 works on — and what it doesn’t.
Suitable
Recommended substrates
- Lime plaster + lime rendering (heritage interiors, conservation surfaces)
- Cement plaster + mineral render (modern residential, commercial)
- Gypsum plaster + gypsum board (primed with 621 Silicate Primer)
- Sound, load-bearing existing mineral coatings
Honest Limits
Where to use a different product
- Lacquer and latex coatings — silicate cannot silicify a non-mineral film. Strip back to the mineral substrate first.
- Gypsum plaster + gypsum board without primer — always prime first with LEINOS 621 Silicate Primer
- Wood substrates — the alkaline silicate stains raw wood. Use the LEINOS wood-finish line instead, starting with LEINOS 290 Interior Hardwax Oil
- Metal — alkalinity attacks aluminium and zinc on contact. Mask and protect, or use a different coating.
- Glazed ceramic tile and non-absorbent surfaces — silicate needs a porous mineral substrate to fuse with.
- Exterior surfaces — use LEINOS exterior-mineral facade paints.
Use With Care
Working safely with 690
- The product is alkaline (pH approx. 11). Protect eyes and skin from splashes — wear safety goggles and chemical-resistant gloves during application. Wash any splashes off skin with plenty of water immediately.
- Mask and protect adjacent glass, natural stone, aluminium, wood, and lacquered surfaces — the alkaline paint attacks and stains them. Wash off splashes at once with plenty of water.
- When airless-spraying, wear a P2 or P3 respirator and ventilate strongly — droplet mist of an alkaline mineral paint is a respiratory irritant.
- Keep away from children during application and cure. The cured mineral surface is inert and safe; wet paint is not.
- Ensure good ventilation during application and the first 24 hours of cure.
- Store the sealed pail cool, dry, and frost-free. Shelf life approximately 12 months unopened. Opened or diluted material is not storable; dispose of dried residues with household waste, liquid residues per local regulations.
Coverage & Pack Sizes
Pick the right pack for the wall.
Two coats are the canonical specification, roughly 54–86 sq ft per litre per coat. Highly absorbent or heritage substrates use more; prime with 621 first to even the draw.
10L
Covers
270–430 sq ft
2 coats, absorbent mineral
Best For
Full room, multi-room project, or heritage conservation work.
sq ft
Enter your area to see how many litres — and the most efficient pack mix — you’ll need for 2 coats.
Documented Applications
See this product in real projects
Documented mineral surface projects. Captions show which LEINOS finish was used.
Full Declaration
Composition
Every ingredient declared on the label. The Trust Hub explains what each one does and the standards behind it.
Water
The carrier. Evaporates during cure — what remains is the silicate network bonded to the substrate. Solvent-free, water-borne formulation.
Potassium Water-Glass (Potassium Silicate)
The reactive binder. Reacts with the silicates in lime plaster, cement, and mineral render (silicification) — chemically fuses the paint into the wall rather than forming a film. The chemistry that defines silicate paint.
Mineral Pigments
Alkali-resistant mineral pigments carry the matt natural-white body and opacity (DIN EN 13300 contrast-ratio Class 2). On-site tinting uses the lime-fast pigments of 668 Pigment Concentrate.
Organic Binder
A small organic binder fraction (dispersion silicate) gives the paint single-pail workability and scrub resistance without compromising the mineral, vapour-open character of the coat.
Got Questions?
Frequently Asked
Quick answers on formulation, application and Indian-climate suitability. Pulled from our full FAQ and TDS library.
- It depends on the condition. Sound, non-chalking, well-bonded dispersion coatings can usually be primed with LEINOS Mineral Plaster Primer 622 first — the primer creates a uniform mineral base for the topcoat. Flaking, chalking, or oil-based finishes must be fully removed back to a sound mineral substrate.
- Yes. LEINOS mineral wall paints are fully breathable (vapour-permeable), allowing moisture to pass through the wall structure naturally.
- The surface must be clean, dry, and structurally sound. New plaster must be fully cured (typically 4 weeks). Prime with the recommended mineral primer.
- All three are breathable, solvent-free mineral paints, but they cure differently. 665 Lime Paint cures by carbonation into calcium carbonate — the softest, most heritage-authentic chalky finish. 660 Natural Resin Emulsion forms a plant-resin film, the most conventional and roller-friendly modern option. 690 Silicate Paint bonds by silicification, giving the most vapour-open surface (Sd ≈ 0.01 m) plus a scrub resistance to Class 2 that neither lime nor emulsion matches, so it spans century-old lime plaster and high-traffic modern interiors. Choose 690 when you need the mineral-bonded, biocide-free breathability of lime with more durability and washability.
- No. A silicate coat does not form a film — it forms a mineral layer, and it ages by an extremely slow reduction in layer thickness that the trade calls chalking (Kreiden). This is a material-typical property of every silicate paint, described in the technical literature, and is not a product defect. It is also why silicate is a conservation-grade finish: the wall can always be recoated without stripping.
- Yes. 690 is supplied natural white and is tintable on site with LEINOS 668 Pigment Concentrate. For a translucent glaze (lasur) effect, thin LEINOS 621 Silicate Primer with water 1:3 to 1:5 and add 668. The critical restriction: only the alkali-resistant pigments of the 668 range survive the silicate chemistry — pigments that are not alkali-fast will fade or shift. Each shade is marked for alkali-fastness in the 668 Pigment Concentrate range.
- The mould resistance comes from the chemistry of the coat itself, not from an added biocide. The alkaline surface (pH ≈ 11) combined with silicification leaves mould, algae, and fungi no organic food source. Because the protection is structural rather than a leaching additive, it does not wash out over time. This is a chemistry-driven property the manufacturer describes as mould-preventing — not an EN-tested antimicrobial specification, and we make no such claim.
- For raw (unpainted) plaster, gypsum plaster, and gypsum board, yes — prime with 621 Silicate Primer first. It is also worth priming patchy or repaired areas so the wall’s absorbency is even and the topcoat lays down uniformly. On sound, evenly absorbent mineral plaster you may be able to apply 690 directly, but 621 never hurts the system. Note that on smooth substrates the primer leaves a slightly grainy texture, which is expected.
- No. Silicate paint requires an absorbent mineral substrate to bond by silicification, and the TDS specifically excludes lacquer and latex coatings. Existing acrylic emulsion, latex, or lacquer films form a skin the silicate cannot fuse with. Strip the wall back to the mineral substrate, or re-plaster, before applying 621 and 690.
For Architects & Specifiers
Downloads
Technical and safety documents — citable in project specifications.
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Written by the LEINOS India technical team, in collaboration with
Reincke Naturfarben R&D, Lower Saxony.
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