Set Retarder

ConTec SR-550 is a ready-to-use liquid admixture that retards setting times by controlling the hydration of cement in the manufacture of concrete products. It is compatible with a wide range of concrete admixtures, but should always be dispensed separately. Use this product to improve the properties of precast concrete when used in conjunction with air entrainment, such as AE-80.

Features & Benefits

  • Retards setting times in cementitious products
  • Increases compressive strengths and reduces permeability
  • Affords a water reduction of 5% or better
  • Reduces segregation
  • Meets ASTM C 494/c and 494M standard for Type B retardation and Type- D water reducing admixtures


ConTec SR-550 retards the initial and final set times of concrete. It meets ASTM C 494/c 494M standard for Type B retardation and Type D water reducing admixtures. Use to improve uniformity and predictability in high performance concrete.

ConTec SR-550



ConTec SR-550 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 495 lb (224 kg) and 265 gallon (1,003 L) totes weighing 2,385 lb (1,082 kg),


ConTec SR-550 can be stored over a wide range of temperatures but should not be allowed to freeze. Should SR-550 freeze, allow complete thawing before mixing by mechanical means. SR-550 has a minimum shelf like of 12 months.  Store properly to extend shelf life.


The addition rates of SR-550 will vary depending on the variations in job conditions and the concrete components being utilized. Typical dosage will range from 2 to 18 US fl oz per 100 lb of cement. Never mix other admixtures with SR-550 before addition to mixer. Consult your ICT representative for assistance to determine the proper dosage for your application.


Specific Gravity at 77°F: 1.21 – 1.24
Viscosity at 77°F cps: 100 max
Weight per gallon: 10.1 – 10.3 lb
% Volatile matter (NVM(1)): ~80
Appearance: Dark Amber Liquid