Mortar Set Retarder

  • Overview
  • Packaging
  • FAQs
  • Advantages
  • Resources

When exposed to hot weather, mortar tends to set up faster than normal. Fortunately, Fritz-Pak’s Mortar Set Retarder offers up to one hour of set delay on even the hottest days. This product slows the hydration rate to keep the mix in a plastic state as you work with it. It does not affect the mix’s overall compressive strength or the color of decorative mixes. Mortar Set Retarder does not contain chloride or other potentially hazardous materials.

Item# Description Bags/Box Boxes/Case
984535.6 oz. (158 gram)24 6
Will Mortar Set Retarder harm the concrete?
Can I redose?
Yes. You can add more Mortar Set Retarder if the initial concrete set has not started. You may redose up to three times.
What happens if you overdose the concrete?
Set time will be longer, but set will still occur.
Will it change the color of concrete or mortar?
  • Designed for masons and contractors who use bagged concrete or mortar
  • Slows down set time of pre-packaged mortar or concrete
  • Easy to use. One bag extends set time about one hour
  • Dosage can be increased for longer retardation, as long as 3 hours
  • Improves mortar or concrete workability
  • Does not affect strength
  • Excellent for use in hot summer months
  • Will not affect colors in concrete
  • Allows for prolonged decorative work
  • Can be easily stored for use as needed
  • Suitable for all types of concrete


Mortar Set Retarder is compatible with most concrete and cement admixtures. When using more than one admixture, each product should be dispensed separately. Mortar Set Retarder does not contain calcium chloride, nitrates, or other potentially corrosive materials. Store in a dry location, protected from breakage, deterioration, and contamination. Mortar Set Retarder is not subject to damage from freezing temperatures.

Applicable Standards

This product meets the following specifications:

  • ASTM C-494 Type B