ProMasonry Cement Products

Data Sheet | SDS


ProMasonry Accelerator is a non-corrosive, environmentally friendly, water based admix that increases the hydration rate of cement. Meets ASTM C494 Type C and E.

Admixture used to protect cementitious materials such as mortar and concrete from damage due to low temperature during early stage curing.


  • Non-corrosive to embedded metal and reinforcing steel. Reduces efflorescence in mortar.
  • Aids proper curing when used in combination with cold temperature practices.
  • Reduces finishing time for concrete slabs and form removal time for cast concrete.
  • Accelerates initial cure by 40%. Allows mortar to bear loads sooner and shortens time to finish.
  • Decreases bleed water and improves workability

ProMasonry Accelerator is an admixture. Refer to the specific product bulletin for material to be used for surface preparation.

Stir or shake container and pour into mix at the desired addition rate.


  • Refer to the technical data in this bulletin for recommended addition rates.
  • Brick and block must be free of excess water.
  • Add ProMasonry Accelerator to the mixing water, not into dry cement.
  • Mix for 3 minutes.
  • When temperatures are expected to be at or below 25F for24 hours or longer, supplemental protection and heat are recommended. Refer to Recommended Practices and Guide Specifications for ColdWeather Masonry Construction published by International Masonry Industry All Weather Council.
  • Heated sand and water may be used.
  • Cover work as completed to aid in curing.
  • Protect from severe weather.


  • Refer to the technical data in this bulletin for recommended addition rates.
  • Cooler mix temperatures will slow rate of initial set, higher mix temperatures will accelerate rate of set.
  • Reduce total water content normally added by at least 10%.
  • Add ProMasonry Accelerator directly to concrete.
  • Mix for at least 3 minutes.
  • Place concrete within 1 hour.
  • Use heated water and aggregate.
  • Temperature of mix when placed should be at least 55F.
  • Sub soil temperature should be above 40F to prevent thermal shock and cracking.
  • Direct flame or gases from heating devices during early stage curing can damage materials.
  • Refer to ACI 306 Recommended

Refer to curing procedures above for concrete and mortar.

Clean tools and equipment as normal.


  • 1 and 5 gallon containers.
  • 18 months in unopened containers.
  • Protect from freezing.
  • Transport and store in cool, clean, dry conditions in unopened containers. High temperature will reduce shelf life.


  • Proper cold weather procedures should be followed when working in freezing temperatures.
  • Product accelerates curing; it is not an anti-freeze.
  • Properly vent enclosures so that gases from heating devices do not cause damage to cementitious materials during curing.
  • Use dry, frost-free masonry units.
  • If ProMasonry Accelerator freezes,it can be thawed and remixed by vigorous shaking before use.


Physical state and appearance :
Clear liquid




Density of liquid coatings:
ASTM D1475 8.4 lbs./gal.

Setting time:
ASTM 191
Initial - set 2 hours earlier
Final - set 1 hour earlier/p>

Water content:
ASTM C494 - 80% of control

Compressive strengths - psi:
3 Days : >1275 psi
7 Days : >1480 psi
28 Days : >1550 psi

Percent of control - %:
3 Days :150%
7 Days :116%
28 Days :119%

Mortar - Temperature

94 lbs. of Cement

80 lb. bag of Type S Mortar

32F and above

22 oz. - 2-3/4 cups

8 oz. - 1 cup

25F - 32F

44 oz. - 5-1/2 cups

16 oz. - 2 cups

20F - 25F

66 oz. - 8-1/4 cups

24 oz. - 3 cups

15F - 20F

88 oz. - 11 cups

28 oz. - 4 cups

Concrete - Temperature

94 lbs. of Cement

Concrete - yds. 3/6 bag mix

32F and above

22 oz. per bag

1 gal.

25F - 32F

44 oz. per bag

2 gal.

20F - 25F

66 oz. per bag

3 gal.

15F - 20F

88 oz. per bag

4 gal.

Determined by addition rate.


  • Product is alkaline. Do not ingest.
  • Avoid breathing vapors.
  • Avoid contact with skin and eyes.
  • Refer to Material Safety Data Sheet (MSDS) for additional information. Keep out of reach of children.


  • In case of skin contact, wash thoroughly with soap and water.
  • For eye contact, flush immediately with a high volume of water for at least 15 minutes and contact a medical professional.
  • For respiratory problems remove person to fresh air.

Dispose of material in accordance with local, state or federal regulations.

Conproco Corp. warrants this product for one year from date of installation to be free from manufacturing defects and to meet the technical properties on the current technical data sheet if used as directed within shelf life. User determines suitability of product for use and assumes all risks. Buyers sole remedy shall be limited to the purchase price or replacement of product exclusive of labor or cost of labor. August 2010 NO OTHER WARRANTIES EXPRESS OR IMPLIED SHALL APPLY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CONPROCO CORP. SHALL NOT BE LIABLE UNDER ANY LEGAL THEORY FOR SPECIAL OR CONSEQUENTIAL DAMAGES.