Metacaulk? MC 150+ is an elastomeric, one-component, general-purpose, fire-rated sealant and smoke seal for construction joints and through-penetrations. A water-based, non-sag caulking grade sealant that is easy to apply as well as to retrofit. Can be applied to horizontal and vertical surfaces. Cures to a paintable flexible seal. Suitable for areas of dynamic movement. Application temperature 40 to 120 deg F. An economic choice for most common applications. Sound Transmission Class (STC) rating 65, The test was performed in accordance with ASTM E90, Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions.
