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Curing Compound

Product: Tech Sheet: MSDS Number: 3-Part Spec Section: Tech Bulletin:
Conspec #21 15240    


Cures, Hardens & Dustproofs


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PRODUCT DESCRIPTION:   A multi-use concrete curing compound. USDA accepted, chemically reactive, with a Five Year Dustproofing Guarantee. Enhances the abrasion, impact, and chemical resistance of concrete.

Conspec #21 is a water-soluble compound specifically formulated to maintain the natural appearance of concrete. The adhesion of secondary toppings, coatings, and final concrete finishes is not affected. It is odorless, non-flammable, and V.O.C. Compliant.

MANUFACTURER:   Conspec 4226 Kansas Avenue Kansas City, Kansas 66106 Customer Service: (800)348-7351 Technical Service: (877)266-7732 Fax: 913-371-3330

USE:   Freshly Placed Concrete: Conspec #21 is formulated for curing and dustproofing freshly cast concrete. Combines with the free lime and other chemicals in the concrete to form a moisture barrier that restricts moisture evaporation, assuring better hydration and a positive cure.

Conspec #21, when applied to concrete, forms an insoluble gel within the surface pores and capillaries. The concrete surface is dust-free and more resistant to cutting oils, salt, alcohol, weak citric acid, kerosene, gasoline, jet fuels and some solvents.

Conspec #21 is recommended for use on exterior concrete surfaces where the natural appearance of the concrete is to be pre-served and weather resistance improved.

  • Conspec #21, when applied as directed, does not affect the bonding characteristics of cement-type toppings, sealers, asphalt, cut-back adhesives, urethanes, epoxies or insulation adhesives.
  • Aged Concrete: renews aged concrete or terrazzo floors and provides a new, long-wearing and dustproofed surface on sound substrates.
  • Conspec #21 applies easily, re-coats easily and contains and upon request, contains red fugitive dye to aid in even application and to check the application.
  • Conspec #21 is non-flammable and non-explosive; no harmful or noxious fumes are created. Safe to use.

APPLICABLE STANDARDS:   USDA accepted for use in federally inspected meat and poultry plants. Meets all local, state, and federal VOC and air quality regulations. Asphalt and Vinyl Asbestos Tile Institute. Federal requirements for silicate concrete surface treatments.

ARCHITECTURAL SPECIFICATIONS:   Cure/Dustproofing Compound: Material must be a sprayable sodium silicate based compound, USDA accepted. Material must not inhibit bonding of any secondary toppings. Use in areas where solvent-based sealers are unacceptable. Approved product: Conspec #21 or approved equal.

APPLICATION:   Coverage: Square Feet Per Gallon (m2/L) Curing, Hardening and Dustproofing: Hard Troweled Finish 300 to 500 (7.4-12.3) Broom or Float Finish 200 to 400 (4.9-9.8) Rough Finish 200 to 300 (4.9-7.4) Aged Concrete 200 to 300 (4.9-7.4) Vertical Surface 200 to 300 (4.9-7.4)

May be applied with sprayer, brush or roller. Spraying provides superior results.

The above rates are approximate. Exact coverage depends upon the porosity of the concrete as well as the job requirements.

Apply immediately after final finishing operations and after the bleed water has receded. At this point, apply promptly. Brush out puddles and runs.

Protect metal, glass, painted and brick surfaces from Conspec #21. If accidentally misapplied, wash with clean water at once.

For aged concrete, surface must be free of dirt and all other foreign matter. Surface should be dry to permit maximum penetration.

COMPOSITION:   Conspec #21 contains silicates to assure complete deep penetrating chemical reaction with the lime and calcium carbonate in the concrete. No waxes, fillers, or flammable materials are added.

Water may be used as the clean-up material. Thinning is not necessary or desirable.

Color: Transparent. Fugitive dye is added to aid in application. Conspec #21 is available without dye upon request.

PACKAGING:   55 gallon drums (208.2 L) 5 gallon pails (18.9 L) 1 gallon jugs (4 to a case)(3.8 L)

LIMITATIONS/PRECAUTIONS:   Protect metal, glass, painted and brick surfaces from Conspec #21. If accidentally misapplied, wash with clean water at once.

Do not use over colored or pigmented concrete. Do not use as a cure on slabs intended for use as a tilt-up casting bed. For tilt-up construction use Conspec Tilt-Eez WB, CST WB, or #1-30 for curing the casting bed. Protect from freezing. If freezing occurs, thaw and agitate well at room temperatures.

Keep out of reach of children. Do not take internally. Avoid prolonged contact with skin. If swallowed, call physician. If splashed in eyes, wash repeatedly with clean water and call physician. Wear rubber gloves, goggles and protective clothing.

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 the product.

GUARANTEE:   Conspec Marketing & Manufacturing Co., Inc. extends to the portion of the above project on which Conspec #21 is used as a hardening and dustproofing agent, a five-year anti-dusting guarantee based on the following procedures:

1. Apply two coats of Conspec #21 at no less than the rate of one gallon per four hundred square feet. The second coat should not be applied sooner than twelve hours after the first application. The material is to be applied as per the written instructions.

2. The material is to be applied under the supervision of Conspec Marketing & Manufacturing Co., Inc. or their authorized agent and a certificate of guarantee issued by Conspec Marketing & Manufacturing Co., Inc.

In the event that the concrete should begin dusting as a result of wear and abrasion during the Five Year Guarantee period, Conspec Marketing & Manufacturing Co., Inc. shall supply enough material, at no charge, to recoat only those areas that are dusting.

V.O.C. CONTENT:   Less than 350 g/l. Complies with Federal V.O.C. standards for Curing Compounds. Do not thin or dilute.

STORAGE:   Conspec #21 should be stored in tightly sealed original factory containers. Store in a horizontal position to prevent moisture accumulation on the drum head. Protect from freezing.

TECHNICAL SERVICES:   Complete technical and specification services are available from the manufacturer and their authorized representatives and distributors.

FILING SYSTEM:   Additional literature and the Material Safety Data Sheet can be obtained from Conspec upon request.
WARRANTY Conspec warrants, for 12 months from the date of manufacture or for the duration of the published product shelf life, whichever is less, that at the time of shipment by Conspec, the product is free of manufacturing defects and conforms to Conspecís published specifications in force on the date of acceptance by Conspec of the order. Conspec shall only be liable under this warranty if the material has been applied, used, and stored in accordance with Conspecís instructions in this technical data sheet. The purchaser must examine the product when received and promptly notify Conspec in writing of any non-conformity before the product is used, or no later than 30 days after such non-conformity is first discovered. If Conspec, in its sole discretion, determines that the product breached the above warranty, it will, in its sole discretion, replace the non-conforming product, refund the purchase price or issue a credit in the amount of the purchase price. This is the sole and exclusive remedy for breach of this warranty. Only a Conspec officer is authorized to modify this warranty. The sales information on the Conspec website and received by the customer during the sales process does not supersede this warranty and the specifications of the product in force on the date of sale. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM, TRADE OR OTHERWISE.
Limitation of Liability Conspec shall not be liable in contract or in tort (including, without limitation, negligence, strict liability or otherwise) for loss of sales, revenues or profits; cost of capital or funds; business interruption or cost of downtime, loss of use, damage to or loss of use of other property (real or personal); failure to realize expected savings; frustration of economic or business expectations; claims by third parties (other than for bodily injury), or economic losses of any kind; or for any special, incidental, indirect, consequential, punitive or exemplary damages arising in any way out of the performance of, or failure to perform, this Agreement, even if Conspec could foresee or has been advised of the possibility of such damages. The Parties expressly agree that these limitations on damages are allocations of risk constituting, in part, the consideration for this agreement, and also that such limitations shall survive the determination of any court of competent jurisdiction that any remedy provided in these terms or available at law fails of its essential purpose.

Distributed By:
4226 Kansas Avenue
Kansas City, KS 66106
Customer Service: 800-348-7351
Technical Service: 877-CONSPEC
Fax: (913) 371-3330





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