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National Guard Products 127SSS Silicone Perimeter Weatherstrip Head and Jamb Set – Stainless Steel
National Guard Products (NGP) model 127SSS is a stainless steel silicone perimeter weatherstrip head-and-jamb set finished in a Brushed #4 Stainless Steel (US32D / 630) housing with a black closed-cell silicone insert. Each set includes one head piece and two jamb pieces sized to fit the frame stop of your specific opening, 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. The 127SSS is UL-certified for fire-rated hollow metal doors up to 3 hours and wood fire doors up to 90 minutes under both standard and positive-pressure conditions, and carries UL Category 'H' certification for smoke and draft control gasketing — making it one of the most comprehensively rated perimeter seals available for commercial door openings. Because this product is made to order, please allow 10–15 business days for production and shipment.
127SSS Silicone Perimeter Weatherstrip – Key Features
- Type 304 Stainless Steel Housing: The carrier is fabricated from Type 304 stainless steel with a Brushed #4 finish (US32D / 630), providing outstanding corrosion resistance in high-humidity, coastal, or chemically active environments.
- Closed-Cell Silicone Seal: The black silicone insert is a synthetic rubber polymer with a closed-cell sponge structure, delivering excellent flexibility and memory so the seal returns to its original shape after compression cycle after cycle.
- Extreme Temperature Performance: Rated from -81°F to 300°F, the silicone gasket remains flexible at extreme low and high temperatures — ideal for exterior doors, cooler vestibules, and mechanical rooms.
- Flame-Resistant and Moisture-Resistant: The silicone compound resists both flame and moisture, meeting the demands of fire-rated openings and wet or humid locations.
- Ozone, UV, and Aging Resistance: Silicone's inherent resistance to ozone and ultraviolet radiation ensures long-term performance without cracking, hardening, or deterioration from environmental exposure.
- FM200 and Halon Compatible: Specifically recommended for facilities that use FM200 or Halon fire suppression systems, where chemical resistance of the gasket material is critical.
- UL Fire Door Certification (Standard and Positive Pressure): Certified by UL to CAN/ULC-S104 and ANSI/UL10B for standard fire conditions, and to ANSI/UL10C for positive-pressure conditions; complies with NFPA 80, NFPA 252, and IBC for hollow metal fire doors up to 3 hours and wood fire doors up to 90 minutes.
- UL Smoke and Draft Control – 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, including performance tests for heat and cold.
- Air Infiltration Control: Recommended by NGP for minimum air leakage and a tight perimeter seal, supporting energy efficiency and conditioned-space integrity.
- Slotted Screw Holes for Field Adjustment: Screw holes are slotted so the seal position can be fine-tuned during installation for consistent compression across the full door perimeter.
- Stainless Steel Fasteners Furnished: #6 x 3/4" stainless steel sheet metal screws (SMS) are included, maintaining finish consistency and corrosion resistance at every attachment point.
- Head-and-Jamb Set Format: Sold as a complete set (1 head + 2 jambs) in five opening sizes, screw-applied directly to the frame stop — no special tools or additional components required.
- Made to Order: Produced to order for each specified opening size; allow 10–15 business days lead time.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 127SSS |
| Product Type | Silicone Perimeter Weatherstrip Head-and-Jamb Set |
| Housing Material | Type 304 Stainless Steel |
| Finish | Brushed #4 (US32D / 630) |
| Seal / Insert Material | Synthetic Rubber Polymer – Closed-Cell Silicone Sponge, Black |
| Profile Section | 1-1/8" x 3/16" |
| Temperature Range | -81°F to 300°F |
| Set Contents | 1 Head + 2 Jambs (complete perimeter set) |
| Application | Screw-applied to frame stop |
| 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 |
| Fasteners Furnished | #6 x 3/4" Stainless Steel Sheet Metal Screws (SMS) |
| Screw Holes | Slotted for field adjustment |
| Fire Rating – Standard | UL Certified to CAN/ULC-S104 and ANSI/UL10B; Hollow Metal up to 3 hrs., Wood up to 90 min.; NFPA 80, NFPA 252 |
| Fire Rating – Positive Pressure | UL Certified to ANSI/UL10C; Hollow Metal up to 3 hrs., Wood up to 90 min.; IBC, NFPA 80, NFPA 252 |
| Smoke and Draft Control | UL Certified to ANSI/UL10C and ANSI/UL1784 Category 'H'; 'S'-labeled Positive Pressure Hollow Metal up to 3 hrs., Wood up to 90 min.; IBC, NFPA 105 |
| BHMA Certification | ANSI/BHMA A156.22 – Certified Gasketing, listed in BHMA Certified Products Directory; includes Heat and Cold performance tests |
| Flame Resistant | Yes |
| Moisture Resistant | Yes |
| Ozone / UV Resistant | Yes |
| Fire Suppression Compatibility | Recommended for FM200 and Halon fire suppression systems |
| Production Type | Made to Order |
| Lead Time | 10–15 Business Days |
Pro Installation Tip
The 127SSS mounts directly to the frame stop — no separate substrate or adapter is required. Because the screw holes are slotted, installers can shift the seal laterally after initial fastening to dial in consistent gasket compression across the full head and both jambs before final tightening. Use the furnished #6 x 3/4" stainless steel SMS screws to maintain corrosion-resistance consistency with the stainless steel carrier, particularly in exterior or high-humidity applications.
| 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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