W-33 Integral Water Repellent Admixture

Integral water repellent liquid to decrease water absorption in precast mixes or in masonry mortar applications.


W-33 is an integral water repellent liquid admixture used in concrete blocks, pavers, roof tiles, and related precast, as well as mortar and stucco mixes. W-33 provides added water repellency, and aids cement hydration to provide increased compressive strengths and improved freeze thaw resistance. W-33 is formulated to reduce cracking, crazing, efflorescence, surface bleeding, and to help provide uniform color to pigmented mixes. W-33 is viscosity modified, allowing the active ingredients to remain in the concrete matrix and not separate or float to the surface during mixing.


  • Reduced moisture absorption
  • Reduced efflorescence & surface discoloration stains & deposits
  • Non-corrosive
  • Mold life extended by reduced concrete friction
  • Corrosion inhibitor of steel reinforcement
  • Improves plain and pigmented mixes
  • Compatible with other admixtures

COMPOSITION: Viscosity modified stearate-based solution. W-33 does not contain any calcium chloride or intentionally added chlorides that would initiate or promote corrosion of reinforcement steel, or contribute to efflorescence.

TECHNICAL DATA: W-33 is compatible with most mineral and chemical components common to Portland cement, calcium alumna cement and calcium sulfate (gypsum).

DIRECTIONS FOR USE: It is recommended that the W-33 be added directly to the mixing water. Dosage is 1 quart (32 ounces) per bag of Portland Cement (2080 ml per 100 kg). Add 16 oz per 100 lbs. of hydrated lime (1040 ml per 100 kg). Higher dosage rates will improve both bond strength and absorption reduction.

SHIPPING NAME: Concrete Admixture –Water-based -Not regulated


AVAILABLE IN: 1 gallon (3.78 L), 5 gallon (18.9 L) pails, 55 gallon (208 L) drums, 265 gallon (1000 L) containers.