3M Fire Barrier Moldable Putty Pads MPP+ (Red) – 7x7 in, Case of 20, Ready-to-Use Intumescent Firestop

Overview

The 3M Fire Barrier Moldable Putty Pads MPP+ in red are designed for conformable, ready-to-use firestop coverage. Sold as a 7 in x 7 in pad and available in a case of 20, these one-part pads are convenient for installers who need to mold, shape, and press directly onto substrates without mixing or special tools. Each pad is 1/10 inch (2.54 mm) thick, offering a slim profile that fits into tight spaces while still delivering reliable performance across a range of applications.

Built to adhere to a variety of construction substrates, the MPP+ pads are non-corrosive to metal and compatible with synthetic cable jackets. The material remains stable over time, resisting crumbling or drying out, and can be re-entered if adjustments are needed after initial installation. This makes them a practical option for both new construction and retrofit projects where time and cost efficiency matter.

Key Benefits

• Ready-to-use and tool-free: One-part pads that mold by hand for quick, straightforward firestop coverage.
• Broad substrate compatibility: Excellent adhesion to most construction materials with noncorrosive behavior on metal surfaces.
• Effective sealing: Helps create draft and cold smoke seals while potentially reducing noise transfer in protected assemblies.
• Re-enterable and durable: Won’t crumble or dry out and can be revisited after installation to refine fit.
• Versatile and scalable: Suitable for protecting electrical boxes, wall openings, cable bundles, and penetrations for pipes or conduits.
• Fire protection tested: Rated up to 4 hours per ASTM E814 (UL 1479); up to 2 hours per UL listings when installed per UL wall-opening protections; STC improvements noted in testing.

Recommended Applications

• Protection of membrane penetrations for listed metallic and non-metallic electrical boxes
• Wall opening protection to meet building requirements
• Sealing gaps between cables in multiple penetrations (including fiber optic inner duct)
• Insulated pipe, electrical conduit, and metal pipe penetrations

Installation Tips

• Simply mold the pad by hand to fill irregular gaps and contours for a secure seal.
• No mixing or tools are required, making it ideal for on-site adjustments.
• For larger areas, pads can be joined together to form continuous barriers.
• Product is intended for industrial/occupational use; follow applicable safety guidelines during handling.

With 3M’s long-standing reputation in fire protection, these MPP+ pads offer a balance of practical handling and tested performance suitable for commercial, industrial, and residential installations where reliable firestop coverage is a priority without sacrificing installation speed.