Product Description
3M™ Fire Barrier Cast‑In Tub Box Assembly 3TB (SKU B40065439) is a rugged, one-piece intumescent tub form installed with concrete formwork. It creates a firestop compartment for 1½″–2″ metal pipes in slabs, adjustable for thicknesses between 4½″ and 8″. When used with the compatible Cast‑In Device, it provides up to 3 hr fire protection per test standards—saving time and eliminating post-pour drilling and sealant steps.
Key Benefits
- 3‑Hour Fire Rating: Tested per ASTM E814/UL 1479 when used with the matching Cast‑In Device.
- Pre‑Pour Installation: Mounts to form or deck before pouring—no post-pour drilling.
- Height Adjustable: Tear-strip design accommodates 4½″ to 8″ slab depths.
- Durable Construction: One-piece design resists jobsite impact and stays in place until concrete sets.
- Labor Savings: Eliminates need for core drilling and firestop caulking after pour.
Best For
- Metal pipe penetrations in concrete slabs
- Projects with slab thicknesses between 4½″ and 8″
- New construction/pre-pour firestop tasks
- Timber floor decks with piping penetrations
- Sites requiring repeatable, reliable fire sealing
- Fast-track schedules aiming to reduce remediation
Product Properties
| Property | Specification |
|---|---|
| SKU | B40065439 |
| UPC | 00051115165863 |
| Pipe Size Range | 1½″–2″ (38.1 – 50.8 mm) |
| Slab Depth Compatibility | 4½″ to 8″ (114 – 203 mm), adjustable via tear strips |
| Fire Rating | Up to 3 hr with compatible Cast‑In Device |
| Installation | Pre-pour mount to form/deck; foam insert removed after concrete sets |
| Material | One-piece intumescent plastic tub, impact-resistant |
| Packaging | 6 units per case |
