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Concrete pumping aid and pump line priming liquid.


Specco W-55 is a neutral, biodegradable, lubricating liquid chemical additive designed to allow easier and improved pumping ability of concrete or grouts. The plasticizing properties of W-55 also contribute to reduced slump and air loss through the pump lines, as well as decreased friction and line pressure with hard to pump mixes. W-55 does not contain any formaldehyde, calcium chloride, or any intentionally added chlorides that would result in corrosion of reinforcement steel or contribute to efflorescence formation and is compatible with other concrete admixture components.


  • Extends equipment life.
  • Increases range and placement of pumped concrete.

COMPOSITION: Viscosity modified sulfonate based solution. W-55 does not contain any calcium chloride or intentionally added chlorides that would initiate or promote corrosion of reinforcement steel, or contribute to efflorescence.


RECOMMENDED ADDITION RATE FOR USE AS A PUMP PRIMER: W-55 is typically pre-diluted at a rate of 16 ounces (1000 ml) per 5 gallons (18.9 L) of water to prime approximately 50 feet of pump line. Add this solution to the pump hopper just prior to pumping the concrete or grout.

RECOMMENDED ADDITION RATE FOR USE AS A PUMPING AID: W-55 is typically added at a rate of 2-3 ounces per cubic yard (62-125 ml /cubic meter) of concrete or grout. Add W-55 directly to the mixer and allow the material to mix for 2-3 minutes to ensure adequate dispersion. Variations in dosage can be made depending on the mix design component amounts, aggregate gradations, concrete temperature, water to cement ratio, and any additional admixture requirements. For example, if the pumped material already contains a water reducer or superplasticizer admixture, the dosage can typically be decreased to 8-12 ounces (236-354 ml) per 5 gallons of water. 

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

Available info for W-55:
Tech Data MSDS

Tech Data



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Kankakee, IL 60901


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