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STI SSM Firestop Mortar

Availability: In stock

SpecSeal SSM Firestop Mortar is a light-weight cost conscious solution for oversized openings in concrete walls and floors. Once mixed with water, SpecSeal Mortar forms a light weight, low density slurry that easily applies into concrete walls and floors. SpecSeal Mortar cures quickly and will not spall or crack due to freezing or changes in temperature.

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Product Description


  • Can be poured, pumped, or troweled in place
  • Partners with other SpecSeal Firestop Products
  • Durable permanent seal
  • Re-penetrable allowing for future penetrants

Application Properties
Blank Opening Autobonding
Busway Light Weight
Cables Intumescent
Cable Tray Low VOC
Metal Pipe No Expiration
Multiple Penetrations Permanent
Plastic Pipe Self Leveling
  STC Rating

Physical properties

Property Value
Colour Pale Red
Odour No perceptible odor
Density Mixed (Wet) 53 to 80 lb/cu. ft = 7.1-10.7 lb/gal (0.85-1.28 kg/L)
Density (Dry Mortar) 24 to 26 lb/cu. ft = 3.21-3.4 lb/gal (0.38-1.42 kg/L)
Flame Spread 0*
Smoke Developement Less than 5*
Application Temperature 35°F (2°C) to 100°F (38°C)
In Service Temperature -10°F (-23°C) to 200°F (93°C)
Storage Temperature No Limit
Ratio of Water/Mortar 17.4/22 to 22/22
Yield (Per 22 lb.) 1,250 cu. in (20.5 L) to 1,400 cu. in (22.9 L)
Open Time 30 Minutes working time
Shelf Life No Limit
  • *Tested to ASTM E84 (UL723) at 14% surface coverage (modified test for sealants and caulks)

Ordering Information

Catalogue Number Description Weight (Each) Packaging Yield
STI_SSM106 SpecSeal SSM Firestop Mortar 22.87 lbs (10.37 kg) Poly Pail 1,325 cu in (21.7 liters)
STI_SSM22B SpecSeal SSM Firestop Mortar 22.41 lbs (10.17 kg) Fiber Bag 1,325 cu in (21.7 litres)