STI Firestop SpecSeal Safing Spray


  • Bridges gaps and irregularities in mineral wool safing
  • Tough polymer designed to resist damage from construction debris
  • Tested for up to 4 Hour fire resistance when tested to ASTM E2307
  • Listed in over 100 UL Tested Curtain wall Systems
  • UL® GreenGuard Gold Certified

SKU: SFS105 Category: Tag:

SpecSeal Safing Spray is a latex-based firestop spray specifically formulated for perimeter fire barrier applications. Safing Spray’s formulation is the perfect balance between elasticity and hardness, curing to form a durable seal that is resistant to water and damage from construction debris. Prior to cure, Safing Spray easily cleans up with water and has extremely low VOC’s to meet demanding regulatory requirements.

Physical Properties

Density/Weight per Gallon10.8 lb/gal (1.29 kg/L)
Solids Content by Weight77.0%
Solids Content by Volume70.1%
Flame Spread0*
Smoke Development0*
Mold & Fungus Growth Rating (ASTM G21)0
Movement Capabilities (ASTM C719)± 12.5 %**
Coverage12.8 sq ft/gal @ 1⁄8″ (0.31 sq m/L @ 3.2 mm)
Viscocity130,000 cps
Solvent ContentNone
In Service TemperatureLess than or equal to 185°F (85°C)
Storage Temperature40°F (4°C) to 95°F (35°C)
Application Temperature40°F (4°C) to 95°F (35°C)
Drying TimeTack Free Time Less Than 2 Hours***
Dry Through24 to 48 Hours
Shore A Hardness65
STC Rating (ASTM E90-09/ASTM C919)Up to 57 (Relates to Specific Construction)
VOC Content30 g/L****
Shelf Life From Date of Manufacture18 months

*Tested to ASTM E84 (UL723) at 14% surface coverage (modified test for sealants and caulks)

**500 Cycles per UL2079, ASTM E1399, and ASTM E1966

***Dependent on temperature and humidity

****Per SCAQMD Rule 1168 (EPA Method 24)


STI Firestop

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