SpecSeal® SSW BLU/BLU2 Intumescent Wrap Strips are highly flexible, elastomeric strips designed to firestop combustible penetrations in fire-rated floors, floor/ceilings, and walls. Ready-to-use in convenient 12 ft (3.7 m) rolls or individually sized precut strips, these products utilize STI’s fast-responding intumescent technology, providing very responsive and highly directionalized expansion for rapid closure of burning combustible penetrants.
Key Features & Benefits
- Rapid expansion – closes off burning penetrants faster than traditional methods
- High volume char – significant expansion (20-60x) effectively seals openings
- Water-resistant – contains no soluble or hygroscopic ingredients
- Economical – 12′ rolls or precut strips minimize waste and reduce installation time
- Highly flexible – no foil backing makes installation easier and more reliable
- Versatile performer – handles wide range of complex combustible penetration applications
- Two-stage expansion (BLU) – enhanced protection with dual temperature activation
- Plastic-faced – durable protective facing on both sides
- Fast response – expansion begins at 250°F (121°C) for BLU, 320°F (160°C) for BLU2
Applications
- Combustible pipe penetrations – nonmetallic pipes and pipe insulation firestopping
- Tuck-in applications – strips secured around penetrant and slid into opening
- Restraining collar assemblies – surface mounting applications
- Complex penetrant configurations – used with other SpecSeal® products for larger openings
- Multiple construction types – concrete floors, steel deck, walls, gypsum board/stud walls
- Wood floor/ceiling assemblies and concrete block wall applications
- Industrial pipe systems requiring combustible penetration protection
Product Range & Specifications
Standard Rolls
| Model |
Thickness |
Width |
Length |
Weight |
Expansion |
| SSWBLU |
3/16″ (4.8mm) |
2″ (51mm) |
12′ (3.7m) |
2.87 lbs |
20x to 30x (Two-Stage) |
| SSWBLU2 |
1/8″ (3.2mm) |
2″ (51mm) |
12′ (3.7m) |
1.71 lbs |
30x to 60x (Single-Stage) |
Precut Strips
| Model |
Trade Size |
Dimensions |
Weight |
Package |
| SSWBLU220 |
2″ pipe |
1.5″ x 8″ x 1/8″ |
0.08 lbs |
100 pieces |
| SSWBLU230 |
3″ pipe |
3″ x 11.25″ x 1/8″ |
0.22 lbs |
100 pieces |
| SSWBLU240 |
4″ pipe |
4″ x 14.75″ x 1/8″ |
0.37 lbs |
100 pieces |
Technical Specifications
| Property |
SSWBLU |
SSWBLU2 |
| Color |
Blue |
Blue |
| Expansion System |
Two-Stage |
Single-Stage |
| Expansion Begins |
1st: 250°F / 2nd: 350°F |
320°F (160°C) |
| Volume Expansion |
20x to 30x |
30x to 60x |
| Service Temperature |
Less than 130°F (54°C) |
Less than 130°F (54°C) |
| Storage Temperature |
Less than 130°F (54°C) |
Less than 130°F (54°C) |
| Shelf Life |
No limit |
No limit |
| Mold & Fungus Rating |
0 (ASTM G21) |
0 (ASTM G21) |
| Fire Ratings |
Up to 4 hours* |
Up to 4 hours* |
| Standards Compliance |
UL Certified, ASTM E814, CAN/ULC-S115 |
UL Certified, ASTM E814, CAN/ULC-S115 |
*Dependent upon grade of wrap strip utilized and system design
Restraining Collar System
Available Restraining Collars
- SSWRC – 2″ width, 30 gauge sheet metal, 25′ roll for ≤4″ trade size pipes
- WSC-8 – 4″ width preformed collar for 6″ and 8″ trade size pipes
- WSC-12 – 5″ width preformed collar for 8″ trade size pipes and larger
Installation Methods
- Tuck-in applications – wrap strip secured around pipe and inserted into opening
- Surface mounting – restraining collar assemblies for accessible installations
- Multi-layer systems – complex configurations using multiple wrap layers and restraining collars
