CONCRETAL® Pigmented Mineral Stain for Concrete


Innovative, Penetrating, and Translucent Mineral Stain
Unsurpassed Design Flexibility


Specifying Raw and Unfinished Concrete
Today, the use of architectural grade, raw and exposed concrete features is extremely popular with clients, architects, designers and specifiers. This creates the demand for high quality cast concrete columns, soffits and other surfaces to meet standards for both strength of concrete and visual finish and color. In addition to design aesthetics, the use of exposed concrete allows the thermal mass of the concrete to help control heating and cooling, making it both efficient and sustainable.

Of course, due to the inherent variable nature of concrete and the limitations of concrete construction practices, variations in texture, color and appearance often occur, despite effective specification, planning and execution. This can result in mechanical treatments, cleaning or blasting and needed repairs that may deliver an unacceptable final appearance.

Concretal® Pigmented Mineral Stain for Concrete
Concretal stain is the ideal solution for unifying uneven or variable concrete finishes and can be used to ensure that the required finish can be delivered to the client’s or specifier’s standard, without looking like a painted surface. The translucent mineral silicate stain’s remedial applications are only a small part of their design versatility, as it also offers a wide range of colors to decorate concrete, without changing the raw concrete’s texture and finish.

Think of this as a color wash specifically developed for concrete surfaces. It is diluted using a complementary Concretal Dilution, at different ratios, delivering a wide range of opacities to achieve the required color and coverage. All this is done without creating a “painted” appearance. The system can also be employed to minimize unsightly repairs, blemishes and color variations in the concrete itself in new installations or in renovated concrete.

Concretal stain penetrates and chemically bonds within the concrete surface creating a microcrystalline structure which allows the free passage of moisture vapor, and will not inhibit heat transfer for thermal mass purposes. It is highly light refractive, even a strongly diluted application will increase the light reflection of the concrete, brightening spaces using both natural and artificial light. Ideal for use in lower light spaces like garages, tunnels, below grade transit stations, etc.

And colors are completely lightfast, no matter how extreme the exposure. Engineered using only natural earthen oxide pigments, which are not affected by U.V. light, ensures color stability throughout its long lifetime. Concretal systems will never fade, peel or blister off the surface.

On-site Trials Ensure Results
In order to achieve the best individual result for any project, it is essential to conduct on-site trials and mock-ups to determine the correct color shades and opacities. This process ensures that each application is unique to the project and ensures the best possible results. It is sometimes necessary to install Concretal Stain at various opacities across large projects to achieve the most uniform overall appearance as the final color appearance is a combination of the stain’s impact and the surface color and texture.

Infinite Control of Color and Transperancy
Concretal Stain is supplied as completely opaque color. To determine how translucent the stain will be applied, a ratio of Concretal Stain is mixed with Concretal Clear Dilution. This ratio is expressed in terms of 1 part stain to “X” parts Dilution. See the image below for a demonstration of how the stain varies in transperancy at various dilution ratios.






Infinite range of colors and opacities Mix on-site, or pre-mixed from the factory, for any combination of color and amount of translucency—maximum design flexibility for bringing various colors, patches and repairs into harmony with overall concrete, or add dynamic, long-lasting color to concrete
Penetrates and leaves no texture behind Treated concrete looks and feels like raw, unpainted concrete—no change to surface texture
Penetrates and bonds chemically within concrete Petrifies and becomes part of the surface, will never peel or blister and wears for decades
Extremely vapor permeable Moisture inside concrete escapes unhindered, promotes ideal moisture balance in building structures
U.V. stable pigments and binders Sol and potassium silicate binder is naturally U.V. resistant and mineral earthen pigments will never fade
Water based, easy to apply Applies easily and requires minimal surface preparation and no special application skills
Non-combustible Won’t burn or contribute fuel or noxious odors in case of fire
Refracts light and U.V. Surfaces stay cooler as light and U.V. are diffused in all directions—darker areas such as parking garages, tunnels, etc. appear brighter
No static charge Inert surface will never attract dust or dirt particles—stays cleaner and looks better longer
High pH and dries out extremely fast Mold, mildew and other bio growth is reduced—surfaces stay fresh and clean



LEED 09 NC Not applicable for exterior
LEED for Homes Not applicable for exterior
LEED 09 CS Not applicable for exterior
LEED 09 CL Not applicable for exterior
Environmental Product Declaration per ISO 14025 and EN 15804 Third-Party Certified



Concrete (standard and high performance) Precast Concrete
Autoclaved Cellular Concrete Tilt-up Concrete
Concrete Masonry Units (CMU) Concrete Fiber Board (siding)
Glass Fiber Reinforced Concrete CMU masonry construction
Portland Stucco Brick and Masonry
Lime Plaster/Stucco Historic Mineral/Masonry Surfaces

*Surfaces must absorb water and should not be previously painted.


Sol-silicate-based, thin layer coating for providing a low pigment finish when diluted with KEIM Concretal-Fixativ or for opaque thin layer protective coatings. Complies with DIN EN 1504-2/2.2 when using it together with KEIM Silan-100.


Concrete Coating and Staining, Concrete Repair, Painting/Coating Interior


For a two-coat opaque finish: approx. 0.25 l/m2 KEIM Concretal-Lasur and approx. 0.04 l KEIM Concretal-Fixativ
For a two-coat low-pigment finish: Depending on degree of dilution, determine by trial application
The stated consumption figures are guide values for a smooth substrate. Exact values can only be determined by painting trial areas on the structure to be coated.

Packaging & Sizes

Red bucket w/white lid - 1 liter, 5 liter and 15 liter containers
Stain: Plastic bucket with plastic lid - Quart, 1 Gallon, 2 Gallon, 4 Gallon
Dilution: Plastic Jerrican - 1.3 Gallon, 5.3 Gallon


For providing a low-pigment finish on fair-faced interior and exterior concrete surfaces, e.g. to retain the fair-faced appearance while concealing stains or repairs with a concrete color shade and for providing colour wash finishes when diluted as required with KEIM Concretal-Fixativ.
For opaque thin layer coatings retaining surface texture and providing a protective water and weather coating

Reference Projects

Sydney Opera House
Sydney Opera House (Sydney, NSW)
Sydney Opera House
Gasson Hall
Gasson Hall (Boston, MA)
Gasson Hall- Boston University
Kindergarten in Vaduz
Kindergarten in Vaduz (VZ)
Bucerius Law School
Bucerius Law School (Hamburg, DE)
St Thomas Regional Library and Records Center
St Thomas Regional Library and Records Center (St Thomas, VI)
St Thomas Regional Library and Records Center,
Texas A & M University--Central Texas, Library
Texas A & M University--Central Texas, Library (Killeen, TX)
Exterior and interior cast concrete walls, columns and beams were discolored and required a transparent finish to help equalize color and appearance without changing bare concrete aesthetic.
University of Pennsylvania, Hamilton House
University of Pennsylvania, Hamilton House (Philadelphia, PA)
Concrete high rise residence for graduate housing at U of P built in early 70's
Columbia University, Alfred Lerner Hall
Columbia University, Alfred Lerner Hall (New York, NY)
Newly built in 1999, multipurpose unique concrete and glass structure serves as the new student center.
University of Pennsylvania, Hamilton Village
University of Pennsylvania, Hamilton Village (Philadelphia, PA)
A collection of three skyscraper and three low-rise residential buildings built in the 1970's.
Clarke County Jail
Clarke County Jail (Athens, GA)
Two separate additions to original facility constructed of precast concrete tilt-up panels.
Smithsonian National Zoo GSB Retaining Wall
Smithsonian National Zoo GSB Retaining Wall (Washington, DC)
New construction- large retaining wall with mural to match a stone affect
University of North Carolina Greensboro Soccer Stadium
University of North Carolina Greensboro Soccer Stadium (Greensboro, NC)
1990's concrete stadium was in need of renovation. Moisture was penetrating concrete and leaking into areas below stadium. Concrete was degrading and had become unsightly and rough.
Clarks America, 1265 Main St
Clarks America, 1265 Main St (Waltham, MA)
Adaptive reuse of abandoned former Polaroid campus building. Approximately 120,000 square foot 1950's era cast in place concrete structure will home to U.S. headquarters of Clarks Shoes.
California Memorial Stadium University of California at Berkeley
California Memorial Stadium University of California at Berkeley (Berkeley, CA)
On the National Register of Historic Places, the 2010-2012 California Memorial Stadium renovation included staining the historic concrete façade so the finish would retain the board-formed textures without loss of the historic repairs. Cracks developed in the façade from movement stress (the stadium is located over the Hayward Fault) were left as part of the historic fabric.
Giannini Hall
Giannini Hall (Berkeley, CA)
Exterior renovation of precast and board-formed concrete protected with water repellency and finished with a translucent mineral stain.
Athens Clarke County Jail Extension
Athens Clarke County Jail Extension (Athens, GA)
Addition to original jail building, precast concrete, tilt-up construction.
Kirche St. Hedwig
Kirche St. Hedwig (Karlsruhe, DE)
Cast concrete construction required decoration, color and protection.  
University of Philadelphia International House
University of Philadelphia International House (Philadelphia, PA)
Built in 1970, cast concrete structure with 15 floors. 
Beverly Gardens Park
Beverly Gardens Park (Beverly Hills, CA)
Resurfacing new cast-in-place concrete surface blemishes.
Iwo Jima Monument, Marine Corps Recruit Depot, Parris Island, SC
Iwo Jima Monument, Marine Corps Recruit Depot, Parris Island, SC (Parris Island, SC)
A 1/3 scale cement/plaster replica of the bronze monument at Arlington Cemetery, this monument sits on the Peatross Parade Deck at the USMC Recruit Depot at Parris Island, SC.  It was first dedicated in 1952 and has had several restorations, including a 1964 full repaint with an epoxy finish to protect the plaster from water and the elements.  
SUNY ALBANY Dormitory Quad Renovation
SUNY ALBANY Dormitory Quad Renovation (Albany, NY)
The uptown campus of The University at Albany, State University of New York bears the unique post-modernist design of Edward Durell Stone, replete with curving arches, slender modern columns open spaces and fountains.  Central to the design is raw concrete and its organic nature.  Composed of four dormitory quadrangles framing the center academic podium, each quad has its own 24 story tower surrounded by low-rise residence halls.  The residence halls and academic podium are protected by large concrete canopies, the towers are not protected and showed signs of wear after decades of exposure.  This renovation project will restore and repair the tower surfaces to ensure the continued long life of these important structures. Scope of the renovation included concrete repairs and to protect the concrete and steel structure while maintaining the original concrete color and finish.  When completed the towers will be much more uniform and not "blotchy", but more importantly the concrete surfaces will repel water and help ensure their long life.  

National Veterans Memorial and Museum
National Veterans Memorial and Museum (Columbus, OH)
Stunning new cast concrete design is home of the nation's National Veterans Memorial and Museum.  Designed by Allied Works, to flow from the landscape, the organic appearance of cast concrete was essential to the success of the design and execution.  White concrete was desired, but integrated color was outside budget parameters.  Raw concrete on interior and exterior was finished with Concretal Pigmented Sol Silicate Mineral Stain in a translucent white color for a natural appearance.  
Concrete House
Concrete House "Silent Rock" (Bammental, BAV)

Located on a gentle slope, with a charming view of the town of Bammental, a holiday home completely made of  concrete painted with KEIM Concretal® Sol Silicate Pigmented Stain in the color 9008, pure black.

Nobu Hotel, Warsaw Poland
Nobu Hotel, Warsaw Poland (Warsaw, PM)

Designed by Przemo Łukasik and Łukasz Zagała, the hotel at Koszykowa street in the center of Warsaw vis-a-vis the fashionable “Koszyki” Market Hall.  Interiors and common spaces were designed by the Medusa Group.  Exterior concrete facade is finished with Concretal Sol Silicate Pigmented Stain in color 9008, pure black.