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Pemko S772BL Double Fin Silicone Astragal — Black, 84" or 96"
The Pemko S772BL is a double-fin silicone adhesive astragal designed for the meeting stile of pairs of commercial doors. The self-adhesive silicone construction allows for fast, tool-free installation directly onto the door edge or frame stop, creating a reliable seal between the two door leaves when both are closed. The Black (BL) finish integrates cleanly with dark anodized aluminum door frames and painted hollow metal pairs common in commercial and institutional construction.
What Is a Double Fin Meeting Stile Astragal?
A meeting stile astragal seals the vertical gap at the centerline of a door pair — the point where the active and inactive leaves meet. The double-fin profile of the S772BL provides two contact fins that compress against the opposing leaf, improving seal consistency even with slight door-to-door misalignment or gap variation. The silicone material maintains flexibility across a wide temperature range, resists compression set, and does not harden or crack with age the way neoprene or vinyl seals can.
Key Benefits
- Double-fin silicone seal: Two fins deliver a tighter, more forgiving seal at the door pair centerline than single-fin profiles
- Adhesive-backed installation: Self-adhesive mount eliminates the need for fasteners or routing — clean surface prep and press to apply
- Black finish: Matches black and dark anodized aluminum door and frame systems for a professional, coordinated appearance
- Silicone material: Outperforms neoprene and vinyl in temperature stability, UV resistance, and long-term flexibility
- Available in 84" and 96" lengths: Fits standard commercial door pair heights including 7'0" and 8'0" door pairs
- Pemko S77 / S772 profile family: Part of Pemko's proven adhesive gasketing line used across commercial, institutional, and industrial applications
Typical Applications
- Meeting stile sealing on aluminum or hollow metal door pairs
- Commercial office, retail, and institutional building entrances
- Replacement astragal seal on existing door pair assemblies
- Draft, light, and dust control at double-door openings
- Upgrade from worn or hardened neoprene or vinyl meeting stile seals
Technical Details
| Feature | Details |
|---|---|
| Manufacturer | Pemko |
| Model / Series | S772BL |
| Profile Type | Double-fin silicone meeting stile astragal |
| Seal Material | Silicone (S suffix per Pemko gasket code) |
| Mounting Method | Self-adhesive (adhesive-backed) |
| Finish | Black (BL) |
| Available Lengths | 84 inches (7'0") or 96 inches (8'0") |
| Application | Meeting stile / active-inactive leaf gap seal on door pairs |
| Product Family | Pemko S77 / S772 adhesive silicone gasketing series |
The Pemko S772BL is an architectural-grade, Self-Adhesive Double Finned Silicone Gasket designed for maximum protection on pairs of doors. Finished in Black (BL), this high-performance seal features a unique double-fin profile that creates multiple air pockets to trap sound and block air infiltration. Engineered for "Smoke and Draft" control, the S772BL is a critical component for fire-rated openings, cleanrooms, and sound-sensitive environments like recording studios or executive boardrooms.
High-Performance Features
- Double-Finned Barrier: The dual-fin design provides redundant sealing points, offering superior sound attenuation (ASTM E90 Tested) and smoke protection (UL1784 Tested) compared to single-bulb gaskets.
- Extreme Temperature Resilience: Maintains 100% flexibility from -58°F to 450°F. It will not become brittle in extreme cold or lose its shape in high-heat industrial applications.
- Superior Compression Set Resistance: Manufactured from high-grade silicone that resists "flattening" over time, ensuring the fins always return to their original shape to maintain a tight seal.
- Acoustic & Environmental Seal: Acts as a high-efficiency weatherization product, preventing heat loss and air infiltration, helping buildings achieve GREENGUARD Gold and LEED certifications.
- Low Closing Force: Despite its heavy-duty sealing capabilities, the silicone fins are engineered to collapse easily, ensuring the door closes and latches without requiring excessive force.
Technical Specifications
- Manufacturer: Pemko (ASSA ABLOY)
- Model Number: S772BL (Black)
- Available Lengths: 84" (7 ft) or 96" (8 ft)
- Material: Siliconoseal (High-Grade Silicone)
- Fire Rating: UL10C Positive Pressure (Category H & J)
- Certifications: BHMA Certified, Smoke Tested (UL1784), Sound Tested (ASTM E90).
| Gasketing Set Size | 7 ft roll or 8 ft roll |
| Brand | Pemko |
| Mounting Type | Adhesive Applied |
| Fire Rated | Fire Rated |
| Smoke Rated | Smoke Rated |
| Sound Rated | Sound Rated |
| Insert Material | Silicone, Double Fin |
| Gasketing Finish | Black |
| Weatherstripping Type | Astragal |
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