ConBlock SH: Sodium-based Surface Hardener

ConBlock SH is a non-toxic, waterborne penetrating concrete sealer made from a proprietary blend of inorganic materials that reacts with Portland Cement Concrete to create crystalline formations within the concrete pore structure. Applying ConBlock SH improves the durability, chemical resistance, and hardness, as well as reducing the porosity of concrete. ConBlock SH is used regularly on highways, bridge decks, and other concrete exposed to freeze-thaw and deicers. Additionally, ConBlock SH reduces “dusting” on concrete surfaces which is beneficial in preparing the surface for the application of coatings and adhesives. ConBlock SH will not change the color of your concrete and can be polished after treatment to create a glossy sheen. Since ConBlock SH is a penetrating sealer and not a coating, the surface characteristics are virtually unaffected.

NSF/ANSI/CAN 61 certified for use in drinking water structures.


  • Reduces dusting
  • Reduces porosity/absorbency
  • Improves freeze-thaw scaling protection
  • Increases chemical resistance
  • Improves abrasion resistance


COLOR: Clear to slightly hazy liquid
COVERAGE 125-200 square feet/gallon
ODOR None too slightly soapy
DENSITY 9.15 lbs/gal
pH 11.5 – 12
VOC 0 g/l
Scaling Resistance ASTM C672 Standard Test Method for Scaling Resistance of Concrete Surfaces Exposed to Deicing Chemicals. After 50 cycles, a block treated with two coats of ConBlock SH showed minimal scaling compared to the control, which showed severe scaling.
Absorption ASTM C642 Standard Test Method for Density, Absorption, and voids in the concrete. A 16% reduction in the absorption after 7 days as compared to the control.
Crack Sealing ODOT SS 841 Proof of Crack Sealing Test (Modified AASHTO T259). ConBlock SH passed with a rating of 8.8 with an average crack width of 0.002″ (0.05mm).
Abrasion Resistance ASTM D4060 Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser. A reduction in mass loss of 53% after 1000 cycles as compared to the control.

FREE Ground Shipping available for orders over $150!