Product Code: K-801


Hard-Cem is an integral hardening admixture used to increase abrasion and erosion resistance of concrete.

Hard-Cem is added to the concrete at the time of batching to increase the abrasion resistance of the concrete and extend concrete wear life. It outperforms and overcomes deficiencies of labor intensive surface applied hardeners, and can be used to enhance durability of both air-entrained and non-air-entrained concretes. Since it is integral, Hard-Cem can be used to harden horizontal, vertical or inclined concrete and shotcrete surfaces.


*Compared to surface applied (dry shake) hardeners.

Recommended Uses

Hard-Cem can be used in any ready mix, shotcrete or precast concrete to improve abrasion and erosion resistance, and extend the wear life of the concrete.


Physical Properties
Appearance Black Powder / Granular Material
Particle Size 50% < 100 microns
Specific Gravity ~3.55
Bulk Density 1,650 kg/m³ (103 lb/ft³)
Plastic Properties
Slump, ASTM C143 No change
Setting Time, ASTM C403 No change
Bleed Water, ASTM C232 Approximately 45% reduction
Entrained Air Content and Stability, ASTM C231 No change
Hardened Properties
Compressive Strength, ASTM C39, C192, (28 Days) No change
Drying Shrinkage No change
Freeze / Thaw Durability, ASTM C666 No change
Deicing Chemical Resistance (Mass Loss), ASTM C 672, (50 cycles) No change
Abrasion Resistance, ASTM C627
(Robinson Type Floor Tester 5,000 revolutions)
66% reduction in mass loss compared to control
(28 days curing)


Hard-Cem is fully compatible with commonly used admixtures and sealers. Dosage is 40 kg/m³ (66 lb/yd³), displacing approximately 30 kg/m³ (50 lb/yd³) of conventional sand in the original concrete mix to maintain design yield.

Unopened bags can be added into the wet concrete only if sufficient wetting, mixing and dispersion within the concrete mix is ensured. Observe concrete discharge to verify full bag disintegration and no visible sign of bag fragments in the concrete. Test prior to use if in doubt. A suitable dust mask, eye protection, gloves and coveralls are recommended when manually dispensing bagged product.

When used in bulk, pneumatic unloading and dispensing of Hard-Cem is similar to that of Portland cement.


The addition of Hard-Cem will not replace good concreting practices – especially those related to mix proportioning, placing, finishing and curing. Concrete treated with Hard-Cem maybe darker than normal Portland cement concrete.


Read the Safety Data Sheet (SDS) for this product. For professional use only. Avoid contact with skin or eyes. Avoid breathing dust. Wear a dust mask, long sleeves, safety goggles and impervious gloves.


Hard-Cem is available in 20 kg (44 lb.) mixer ready bags, 1,600 kg (3,527 lb.) super bags and bulk pneumatic.

Shelf Life

Hard-Cem has a shelf life of 36 months when stored in a dry enclosed area.


Kryton International Inc. (Kryton) warrants that Kryton products are free from manufacturing defects and comply with the specifications given in their respective technical data sheet. Because conditions of use, such as site conditions, surface preparations, workmanship, concrete ingredients, weather, structural issues and other factors are beyond the control of Kryton, no warranty can be given as to the results of use. Purchaser agrees to seek the advice of qualified professionals and to determine for themselves the suitability of the products for their intended purpose and assumes all risks. Purchaser’s sole remedy is limited to replacement of any product proven defective or at Kryton’s option refund of the purchase price paid. THIS LIMITED WARRANTY CONTAINS THE ENTIRE OBLIGATION OF KRYTON. NO OTHER WARRANTIES, EXPRESS OR IMPLIED, SHALL APPLY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. KRYTON SHALL NOT BE LIABLE UNDER ANY LEGAL THEORY FOR SPECIAL OR CONSEQUENTIAL DAMAGES. No representative of Kryton has the authority to make any representations or provision except as stated herein. Kryton reserves the right to change the properties of its products without notice.