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National Guard Products 120SDKB Silicone Sponge Perimeter Weatherstrip Head-and-Jamb Set – Dark Bronze
National Guard Products (NGP) 120SDKB is a silicone sponge perimeter weatherstrip head-and-jamb set finished in Dark Bronze with a black closed-cell microcellular silicone sponge insert. Each set includes one head piece and two jamb pieces, screw-applied directly to the frame stop, and is available in five standard opening sizes: 3'0 x 7'0, 4'0 x 7'0, 6'0 x 7'0, 6'0 x 8'0, and 8'0 x 8'0. Engineered to deliver a tight perimeter seal on commercial hollow metal and wood fire-rated doors, the 120SDKB carries UL listings for fire, positive pressure, and smoke-and-draft control applications — making it one of the most comprehensively certified door perimeter weatherstrip products available for demanding commercial and institutional openings. Because each set is made to order, please allow 10–15 business days for production.
High-Performance Silicone Sponge Weatherstrip Features
- Patent-Pending Microcellular Silicone Insert: NGP's closed-cell sponge construction delivers exceptional compression set recovery, maintaining a consistent perimeter seal through years of door cycling.
- Extreme Temperature Flexibility: Remains fully flexible from -81°F to 300°F, making the 120SDKB suitable for cold-storage corridors, mechanical rooms, and high-heat industrial environments.
- Flame- and Moisture-Resistant: The silicone sponge insert resists flame spread and moisture absorption, protecting door openings against both fire conditions and weather infiltration.
- Superior Ozone, UV, and Aging Resistance: Silicone chemistry resists degradation from ozone exposure, ultraviolet light, and long-term environmental aging — preserving seal integrity over the life of the opening.
- FM200 and Halon Compatible: Specifically recommended for areas protected by FM200 or Halon gaseous fire suppression systems, where seal material compatibility is critical to system performance.
- BHMA Certified Performance: Certified to ANSI/BHMA A156.22 performance tests for heat and cold, and listed in the BHMA Certified Products Directory.
- UL Fire-Door Certified (Standard and Positive Pressure): Certified by UL to CAN/ULC-S104 and ANSI/UL10B for hollow metal fire doors up to 3 hours and wood fire doors up to 90 minutes; also UL certified to ANSI/UL10C for positive pressure applications complying with IBC, NFPA 80, and NFPA 252.
- UL Smoke and Draft Control — Category 'H': Certified by UL to ANSI/UL10C and ANSI/UL1784 Category 'H' for use on 'S'-labeled positive pressure hollow metal fire doors up to 3 hours and wood fire doors up to 90 minutes, complying with IBC and NFPA 105.
- Aluminum Alloy 6063-T5 Carrier: The extruded aluminum retainer provides rigid, stable mounting on the frame stop while offering long-term corrosion resistance in commercial environments.
- Slotted Screw Holes for Field Adjustment: Pre-slotted holes allow installers to fine-tune the seal position on the frame stop for precise compression against the door face.
- Stainless Steel Fasteners Included: #6 x 3/4" stainless steel sheet metal screws are furnished with every set, eliminating a separate fastener purchase and ensuring corrosion-resistant installation.
- Dark Bronze Finish: Coordinates with dark bronze door frames and commercial hardware suites for a clean, architectural appearance.
- Head-and-Jamb Set Configuration: Supplied as a complete three-piece perimeter set (one head, two jambs) for one opening — no need to order pieces separately.
- Five Standard Opening Sizes: Available for openings 3'0 x 7'0, 4'0 x 7'0, 6'0 x 7'0, 6'0 x 8'0, and 8'0 x 8'0 to accommodate single, oversized, and double commercial door openings.
- Made to Order: Each set is manufactured to order; please plan for a 10–15 business day production lead time.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 120SDKB |
| Product Type | Silicone Sponge Perimeter Weatherstrip Head-and-Jamb Set |
| Finish | Dark Bronze (DKB) |
| Insert / Seal Material | Black Closed-Cell Microcellular Silicone Sponge (Patent Pending) |
| Carrier Material | Aluminum Alloy 6063, T5 Temper |
| Synthetic Rubber Polymer Type | Closed-Cell Sponge |
| Typical Section Profile | 5/8" x 3/16" |
| Set Contents | 1 Head Piece + 2 Jamb Pieces (complete perimeter set for one opening) |
| Available Opening Sizes | 3'0 x 7'0 | 4'0 x 7'0 | 6'0 x 7'0 | 6'0 x 8'0 | 8'0 x 8'0 |
| Mounting Method | Screw-applied to the frame stop |
| Screw Holes | Slotted for field adjustment |
| Fasteners Furnished | #6 x 3/4" Stainless Steel Sheet Metal Screws |
| Temperature Range | -81°F to 300°F |
| Fire Door Rating — Standard Pressure | UL Certified (CAN/ULC-S104 & ANSI/UL10B): Hollow Metal up to 3 Hours; Wood up to 90 Minutes; complies with NFPA 80 & NFPA 252 |
| Fire Door Rating — Positive Pressure | UL Certified (ANSI/UL10C): Hollow Metal up to 3 Hours; Wood up to 90 Minutes; complies with IBC, NFPA 80 & NFPA 252 |
| Smoke & Draft Control | UL Certified (ANSI/UL10C & ANSI/UL1784 Category 'H'): 'S'-labeled Positive Pressure Hollow Metal up to 3 Hours; Wood up to 90 Minutes; complies with IBC & NFPA 105 |
| BHMA Certification | ANSI/BHMA A156.22 — Heat and Cold Performance Tests; Listed in BHMA Certified Products Directory |
| Fire Suppression Compatibility | Recommended for FM200 and Halon fire suppression system areas |
| Additional Properties | Flame-Resistant, Moisture-Resistant, Ozone-Resistant, UV-Resistant, Aging-Resistant |
| Availability | Made to Order — 10–15 Business Day Production Lead Time |
Pro-Tip for Perimeter Sealing
The NGP 120SDKB is designed for surface application directly to the frame stop of hollow metal or wood door frames. The slotted screw holes allow you to shift the retainer slightly toward or away from the door face before final tightening, so you can dial in the correct compression of the silicone sponge insert without over-compressing the seal. Use the furnished #6 x 3/4" stainless steel sheet metal screws for a corrosion-resistant installation that holds up in both interior and exterior-adjacent applications. When ordering for a double opening (6'0 or 8'0 wide), confirm the frame rabbet configuration so the set is cut correctly for an astragal or meeting-stile condition at the centerline.
| Gasketing Set Size | 3'0 x 7'0 Set or 4'0 x 7'0 Set or 6'0 x 7'0 Set or 6'0 x 8'0 Set or 8'0 x 8'0 Set |
| Brand | National Guard Products |
| Housing Finish | Dark Bronze |
| Smoke Rated | Smoke Rated |
| Weatherstripping Type | Perimeter Gasketing |
| Housing Size | 5/8" x 3/16" |
| Insert Color | Black |
| Fasteners | #6 x 3/4" Stainless Steel Sheet Metal Screws Furnished |
| Fire Rated | Fire Rated |
| Insert Material | Silicone |
| Mounting Type | Screw Applied - Exp Screw, Surface Mounted |
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