Raeco R-25 is a two components, concrete repair and topping compund consisting of a uniform, premixed blend of portland cements and graded washed silica aggregates witha liquid latex modifier to promote lasting surface adhesion, for renovation and new construction. R-25 can be applied from feathered edge to any depth, for thickness greater than 1/2" (12.7mm) use appropriate aggregate. R-25 is a fine textured underlayment especially formulated for linoleum, vinyl, carpet and other finished floor products. R-25 is used for horizontal surfaces and can be sanded to a very smooth finish. R-25 contains no gypsum, chlorides, ferrous metals or corrosive agents.

PROPERTIES
COMPRESSIVE STRENGTH, PSI (ASTM C-1439)
7 Days: 3320
28 Days: 4045

TENSILE STRENGTH, PSI (ASTM C-190)
28 Days: 750

FLEXURAL STRENGTH, PSI (ASTM C-256)
28 Days: 1600

SHEAR BOND, PSI (DOW Chemical Test Method)
5 Days: 650+

Greater strength achieved with coarse aggregate

Flame Spread: 0

Fuel Contribution: 0

Smoke Development: 0

Compatible with most floor adhesives

Smooth or broom finish achievable

Fire Retardant

Non-toxic

Corrosion Resistant

U.S.D.A. approved

AREAS OF USE

Underlayment for all finished floor products

Horizontal applications

Filling holes, cracks and spalled areas

Elevation transitions

Freeze-thaw resistant

Leveling or creating pitch to drains

Rained out or freeze damaged slabs

Areas with varying weather cycle

PACKAGING

45 lb. bags (20.25 kg.)

(40 bags per pallet)

APPROXIMATE COVERAGE

45lb.bag: 45 sq.ft @ 1/8"

Bulked with #8 Silica sand:
45lb. bag: 16.88 sq.ft. @ 1/2"

Bulked with 3/8" pea gravel:
45lb. bag: 8.16 sq.ft. @ 1"

For Thickness:
1/2" to 1" use #8 silica sand @ 25lbs. per bag
1" & up use 3/8" pea gravel @ 25lbs. per bag

SURFACE PREPERATION
Surfaces to be covered must be structurally sound, clean and free of dust, oil, grease, sealers, curing compounds, laitance, release agents or other surface contaminants. For smooth surfaces, we recommend mechanical abrasion to achieve an acceptable surface profile. The cleaning and preparation method selected depends on both the sub-floor material and its condition. Acid etching is not recommended. For optimum adhesion, mix R-25 powder with the R-25 latex to a slurry consistency and brush thoroughly into the area to be covered. Raeco R-2000 may also be used as a bonding medium. DO NOT USE R-25 LATEX AS A BONDING AGENT.

MIXING
Raeco R-25 is mixed by adding R-25 latex binder at a rate of approximately .9 gallons (3.41 liters) of latex binder for each 45 lb. bag of dry powder. More or less latex binder may be added to obtain the desired consistency, but do not exceed 2 gallons (7.58 liters) of latex binder for each 45 lb. bag of R-25. The latex binder should be added to the mixing container first, then the R-25 powder, followed by the appropriate aggregate (when used).

Using a mixing paddle (a whip type is recommended) with a low speed drill (400 to 500 rpm), mix thoroughly (2 to 3 minutes) until the powder has been completely dispersed and the mix has acquired a smooth homogeneous texture. Do not add more latex binder once R-25 has started setting up. The pot life of the mix averages about 30 minutes and working time 30 to 45 minutes, depending on the temperature. It is recommended to mix only the amount of R-25 that can be applied within that amount of time.

APPLICATION
Apply the Raeco R-25 mixture with a trowel or straight edge, trowel to desired texture, on the prepared surface. Should a broom finish be desired, do so immediately after placement. Do not add or spray latex binder onto the surface for finishing - it may cause the surface to blister or spall. Rough spots or trowel marks may be sanded off the surface, using a medium to fine grit sandpaper after R-25 has set up. Sanding should be accomplished after the appropriate time of curing has occurred, normally over night. Allow an adequate curing time before applying a sealer, use a water based concrete sealer (surface or penetrating). Before installing any finished floor products, make sure to follow the adhesive manufacturer’s recommendations.

When R-25 is to be applied on surfaces other than concrete (i.e., wood, metal, terrazzo, gypsum underlayments, etc.), consult Raeco’s Technical Service Department for recommended preparation, bonding, and application procedures.

LIMITATIONS
Raeco R-25 should only be applied over substrates that are between 40° and 90° F. (4.4° and 32.2° C.) Do not apply in the rain, and do not allow to freeze before curing has taken place. When applying R-25 to thickness greater than 1/2" (12.7 mm.), bulk the mix with the appropriate type and amount of aggregate (refer to Coverage Section).

WARNING
Raeco R-25 contains Portland cement and silica sand. Use of a dust respirator, safety goggles and rubber gloves are recommended. In case of contact with eyes, immediately flush with water and consult a physician. Avoid hazards by following all precautions found in the Material Safety Data Sheet (MSDS), product labels and technical literature. Please read this information prior to using product.