Cement Technology
a division of Masonry Supply, Inc.
156 Piper Road
Covington, Georgia  30015
tel. 770-784-1424
fax. 770-784-0909


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MS-Plug is a cement-based hydraulic cement that is fast setting.  It is used to instantly stop running water or seepage leaks in concrete or masonry.  When mixed with clean potable water, STANDARD MIX sets in 3 to 5 minutes; HOT MIX in 45 to 90 seconds.  Actual setting time depends on the temperatures of the dry powder, mixing water, and the structure to be patched.  Cold temperatures will retard the setting time.  Hot temperatures will accelerate it. Mixing water should be around 21 degrees Celsius.  MS-Plug expands as it sets.


MS-Plug is used above or below grade, interior or exterior, to stop water seepage and flowing water in concrete and masonry.  MS-Plug is an ideal patching material for manholes, sewers, concrete pipe, wells, retaining walls, water treatment plants, tunnels and basements.


MS-Plug is a blend of Portland cement, fine aggregates, and other ingredients modified to control initial and final set times.

Surface Preparation

All surfaces must be clean and free of dirt, dust, paint, and sealers that will inhibit the patching material from bonding.  Dampen areas to be patched before applying MS-Plug.  DO NOT retemper.  MS-Plug is recommended for use when the temperature is 40 degrees F and falling.

Mixing Instructions

Pour water into a mixing container (1 pint of water will mix approximately 8 lbs of powder).  Add the dry powder, mixing rapidly with a trowel to a stiff, no slump consistency.  Mix no more than 30 seconds.  Do not add aggregate or additives to the mix.

Application Techniques

Dampen surface to be patched with water prior to application of Ms-Plug.  Form the patch in the shape of a cone and force it into the cracks or holes where water is seeping.  Keep pressure on the patch until it achieves its initial set.  MS-Plug may be shaved to conform to surrounding surfaces.


One pound will fill 17 cubic inches or a crack 3/4" x 3/4"x 30".

Technical Data

Compressive Strength ASTM-C-109 1 day 3500 psi
7 days 4900 psi
28 days - 5500 psi
Tensile Strength ASTM C-190 1 day 200 psi
7 days 250 psi
28 days 450 psi
Volume Change   None
Set time @ 77 F Standard Mix 3 to 5 minutes
Hot Mix 45 to 90 seconds

Environmental & Safety Precautions

MS-Plug contains Portland cement and is alkaline on contact with water.  Wear rubber gloves.  It is irritating to eyes and skin.  In case of eye contact, flush eyes with water repeatedly and call a physician immediately.  DO NOT Rub eyes.  Keep out of reach of children.  Consult Material Safety Data Sheet for more information.


MS-Plug is available in 10 lb cans (4 per case) or 50 lb pails (36 per pallet).


MS-Plug is stored on pallets protected from moisture.

Shelf Life

Shelf life of MS-Plug is one year in proper storage.


This product conforms to current applicable specifications and is manufactured to meet published physical properties when properly cured and tested according to ASTM standards.  Since seller has no control over the conditions of use or storage of the product sold, seller can not guarantee the results obtained through the use of its products.  The buyer shall determine the suitability of the product for its own purpose.  Seller shall in no event be liable for consequential (including loss of profits) or punitive damages.  Seller's liability hereunder, if any, shall be limited to replacement of goods sold.  This warranty is in lieu of any and all other warranties, expressed or implied.

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Last modified: July 17, 2001