Overview
FlameSafe FSP1000 firestop putty is an easy-to-install, non-hardening sealant manufactured by Grace Construction Products (formerly IPC). It is specifically engineered for sealing penetrations and openings in fire-rated walls, ceilings, and floors where power and data communication cables pass through. The 66881 part number represents a box of six 2lb tubes, each containing 36 cubic inches of material, providing a complete solution for firestop applications.
Key Features
- Non-hardening formulation – Remains pliable for easy re-entry and cable replacements without loss of fire rating
- Intumescent expansion – Expands approximately 200% when exposed to fire to arrest smoke, flames, and toxic gases
- Hand-pack application – No tools or special equipment required; simply knead and pack the putty around penetrants
- Excellent dielectric properties – Safe for use around electrical installations and data cabling
- UL and ULC approved – Tested and approved under UL File R11636 and ULC File CR1538 for fire-rated systems
- Box of 6 tubes – Provides 216 cubic inches total for large-scale firestop projects
Technical Specifications
| Part Number | 66881 |
| Product Name | FlameSafe FSP1000 Firestop Putty |
| Tube Size | 2 lbs (32 oz.) |
| Volume per Tube | 36 cubic inches (590 cubic cm.) |
| Quantity per Box | 6 tubes |
| Total Volume per Box | 216 cubic inches |
| Total Weight per Box | 12 lbs (approximately) |
| Type | Non-hardening intumescent firestop putty |
| Application | Power and data communication cable penetrations |
| Fire Rating | Approved for fire-rated wall, ceiling, and floor assemblies |
| Intumescent Expansion | Approximately 200% (2x) when exposed to fire |
| Approvals | UL, ULC, NYC MEA 448-04-M, BOCA |
| Manufacturer | Grace Construction Products (formerly IPC) |
Typical Applications
- Sealing power and telecommunications cable penetrations through fire-rated walls and ceilings
- Filling voids and cavities around bundled cables in fire-rated floor/ceiling assemblies
- Retrofit work in existing buildings where cable routes require modification
- Commercial and industrial building firestopping compliance
- Data center and telecommunications facility installations
- Building code compliance for fire-rated compartmentalization
Compatibility & Replacements
Compatible With
- UL and ULC fire-rated wall assembly systems (C-AJ series and W-series designations)
- Power transmission cables and conduits
- Data communication cables (twisted pair, fiber optic, coaxial)
- Fire-rated wall, ceiling, and floor construction materials
- Other FlameSafe firestop products (pillows, wrap strips, sealants) as system components
- Electrical boxes and cable penetration points requiring fire-rated sealing
Replaces / Drop-In Replacement For
- Part number 66881 is the standard FlameSafe FSP1000 2lb tube box of 6 configuration
- May replace other non-hardening putty products in similar firestop applications, subject to system re-approval
- Previous IPC-branded FSP1000 stock; now supplied by Grace Construction Products
Works With
- UL fire-rated system assemblies including FS 900+ sealants, FS 3000 coatings, and FSIS sleeves
- Fire-rated barrier pillow systems (FSPIL series)
- FlameSafe wrap strips and bag products
- ASTM E814 (ANSI/UL 1749) compliant firestop system designs
- NYC Department of Buildings accepted materials (MEA 448-04-M certification)
