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National Guard Products 120SSS Silicone Perimeter Weatherstrip – Stainless Steel Head-and-Jamb Set
National Guard Products (NGP) model 120SSS is a stainless steel silicone perimeter weatherstrip supplied as a complete head-and-jamb set (one head piece plus two jamb pieces) in a Brushed #4 Stainless Steel finish (US32D / 630) with a black closed-cell silicone insert. Screw-applied directly to the frame stop, the 120SSS 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 — and is made to order with a typical lead time of 10–15 business days. Its UL-certified fire, positive-pressure, and smoke-and-draft-control ratings make it one of the most specification-ready perimeter gasketing systems available for hollow metal and wood fire-rated door assemblies in commercial, institutional, and high-security environments.
Key Features of the NGP 120SSS Stainless Steel Silicone Perimeter Seal
- Stainless Steel Type 304 Housing: Corrosion-resistant Type 304 stainless steel retainer provides long-term durability in demanding or high-humidity environments.
- Closed-Cell Silicone Sponge Insert: The synthetic rubber polymer (closed-cell sponge) silicone gasket delivers excellent flexibility and memory, conforming tightly to door frames and returning to its original shape after each door cycle.
- Extreme Temperature Performance: Rated from -81°F to 300°F, this silicone gasket remains flexible at extreme temperatures, making it suitable for cold-storage facilities, high-heat industrial applications, and fire-rated assemblies alike.
- Flame-Resistant and Moisture-Resistant: The closed-cell silicone construction resists flame spread and prevents moisture infiltration, protecting door openings against weather and environmental exposure.
- Superior Environmental Resistance: Offers excellent resistance to ozone, UV radiation, and aging, maintaining a reliable seal over the life of the door assembly without cracking or degrading.
- FM200 and Halon Compatible: Specifically recommended for areas utilizing FM200 or Halon fire suppression systems, where gasket material compatibility with suppression agents is critical to system integrity.
- UL-Certified Fire Door Rating: Certified by UL to CAN/ULC-S104 and ANSI/UL10B; complies with NFPA 80 and NFPA 252 for hollow metal fire doors rated up to 3 hours and wood fire doors rated up to 90 minutes.
- UL-Certified Positive Pressure: Certified by UL to ANSI/UL10C; complies with IBC, NFPA 80, and NFPA 252 for positive-pressure hollow metal fire doors up to 3 hours and wood fire doors up to 90 minutes.
- Smoke and Draft Control Gasketing – UL Category 'H': Certified by UL to ANSI/UL10C and ANSI/UL1784 Category 'H'; complies with IBC and NFPA 105 for use on 'S'-labeled positive-pressure hollow metal fire doors up to 3 hours and wood fire doors up to 90 minutes.
- ANSI/BHMA A156.22 Certified: Certified gasketing complies with the American National Standard for Door Gasketing and Edge Sealing Systems and is listed in the BHMA Certified Products Directory. Also certified to ANSI/BHMA A156.22 performance tests for heat and cold.
- Air Infiltration Control: Recommended for minimum air leakage applications, delivering a tight perimeter seal that supports energy efficiency and indoor climate management.
- Slotted Screw Holes for Field Adjustment: Screw holes are slotted to allow precise on-site alignment adjustment after installation, simplifying fitting to real-world frame conditions.
- Stainless Steel Fasteners Furnished: #6 x 3/4" stainless steel sheet metal screws (SMS) are included, ensuring corrosion-consistent fastening that matches the housing material.
- Head-and-Jamb Set in Five Opening Sizes: Supplied as a complete three-piece perimeter set sized for openings of 3'0 x 7'0, 4'0 x 7'0, 6'0 x 7'0, 6'0 x 8'0, or 8'0 x 8'0, reducing field cutting and material waste.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 120SSS |
| Product Type | Silicone Perimeter Weatherstrip – Head-and-Jamb Set |
| Finish | Brushed #4 Stainless Steel (US32D / 630) |
| Housing Material | Stainless Steel Type 304 |
| Gasket Material | Silicone – Synthetic Rubber Polymer, Closed-Cell Sponge |
| Gasket Color | Black |
| Section Profile | 1-1/8" x 3/16" |
| Set Contents | 1 Head + 2 Jambs (complete perimeter set) |
| 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 |
| Application | Screw-applied to frame stop |
| Fasteners Furnished | #6 x 3/4" Stainless Steel SMS (Sheet Metal Screws) |
| Screw Holes | Slotted for field adjustment |
| Temperature Range | -81°F to 300°F |
| Fire Door Rating – Standard Pressure | UL Certified to CAN/ULC-S104 and ANSI/UL10B; NFPA 80 and NFPA 252 compliant; Hollow Metal up to 3 Hours, Wood up to 90 Minutes |
| Fire Door Rating – Positive Pressure | UL Certified to ANSI/UL10C; IBC, NFPA 80 and NFPA 252 compliant; Hollow Metal up to 3 Hours, Wood up to 90 Minutes |
| Smoke and Draft Control | UL Certified to ANSI/UL10C and ANSI/UL1784 Category 'H'; IBC and NFPA 105 compliant; 'S'-labeled Positive Pressure HM up to 3 Hours, Wood up to 90 Minutes |
| BHMA Certification | ANSI/BHMA A156.22; Listed in BHMA Certified Products Directory |
| Suppression System Compatibility | Recommended for FM200 and Halon fire suppression system areas |
| Availability | Made to Order – Typical Lead Time 10–15 Business Days |
Pro Tip: Because screw holes are slotted, installers can shift the retainer slightly after initial placement to achieve a consistent compression fit across the full door height and width before final tightening. Stainless steel SMS fasteners are furnished with each set, so no separate hardware sourcing is required for a standard frame-stop application.
| 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 | Stainless Steel |
| Smoke Rated | Smoke Rated |
| Weatherstripping Type | Perimeter Gasketing |
| Housing Size | 1-1/8" x 3/16" |
| Insert Color | Black |
| Fasteners | #6 x 3/4" Stainless Steel SMS |
| Fire Rated | Fire Rated |
| Insert Material | Silicone |
| Mounting Type | Screw Applied - Exp Screw, Surface Mounted |
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