Metacaulk® 350i is a one-component, general purpose fire-rated sealant and smoke seal for construction joints and through-penetrations.
 
Metacaulk® 350i is an intumescent, water-based, non-sag caulking grade sealant that is easy to apply and great for retrofits. It cures to an elastomeric seal that is suitable where dynamic movement is expected. Can be applied to horizontal and vertical interior surfaces. Application temperature 40°F to 120°F. Sound Transmission Class (STC) rating 53, The test was performed in accordance with ASTM E 90, Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements.
 
Features
Flexible cure
Excellent freeze-thaw
For interior use – paintable
STC rating 53
Tested to ASTM E814 (UL 1479) & ASTM E1966 (UL 2079)
3 year shelf life
Complies to UL required Accelerated Aging and High Humidity Testing