The RectorSeal 66648 Metacaulk MC 150+ Firestop Sealant is a versatile and highly effective solution designed to prevent the spread of flames, smoke, and hot gases through construction joints and penetrations. This sealant is ideal for use in various construction applications, ensuring safety and compliance with fire protection standards. Here’s an in-depth look at its features and benefits:

Key Features:

• Intumescent Formula: Metacaulk MC 150+ is an intumescent, one-component, general-purpose fire-rated sealant. When exposed to heat, it expands to form a strong barrier that prevents the spread of fire and smoke 
• Non-Sag Caulking Grade: The sealant is a water-based, non-sag caulking grade, making it easy to apply and retrofit. It adheres well to various surfaces, including metal, insulated, fiberglass, and plastic pipes 
• Sound Transmission Class (STC) Rating: With an STC rating of 65, Metacaulk MC 150+ also provides soundproofing benefits, reducing noise transmission through walls and joints 
• Versatile Application: Suitable for both vertical and horizontal surfaces, this sealant can be used in a wide range of applications, including construction joints and through-penetrations 
• Durability and Movement: The sealant remains effective even with minimal depth, demonstrating its durability and ability to accommodate movement 
• Compliance with Standards: Metacaulk MC 150+ meets ASTM E814, UL1479, and UL 2079 standards, ensuring compliance with fire protection regulations 

Benefits:

• Enhanced Fire Protection: By preventing the spread of flames, smoke, and hot gases, Metacaulk MC 150+ helps ensure the safety of buildings and occupants 
• Improved Soundproofing: The high STC rating provides additional benefits by reducing noise transmission, contributing to a quieter environment 
• Ease of Use: The water-based formula and straightforward application process make it accessible for various users, from professional contractors to DIY enthusiasts 
• Cost-Effective: As an economic choice for most common applications, this sealant provides reliable fire protection without breaking the budget 

Specifications:

• Volume: 10.3 ounces
• Color: Red
• Application: Suitable for metal, insulated, fiberglass, and plastic pipes; top-of-the-wall construction joints; power and telephone cables
• Formula: Water-based, flexible, highly intumescent
• Standards: ASTM E814, UL1479, UL 2079
• Sound Transmission Class (STC) Rating: 65

The RectorSeal 66648 Metacaulk MC 150+ Firestop Sealant is an essential tool for ensuring fire safety and compliance in construction projects. Its ease of use, combined with its high performance and versatility, makes it a reliable choice for maintaining the integrity of fire-rated assemblies