Stormproof Aluminium Casement Windows
Shaanxi SGL Doors&Windows Technology Co., Ltd. is one of the most reliable manufacturers and suppliers of stormproof aluminium casement windows in China, also supports customized service. Please feel free to wholesale high quality stormproof aluminium casement windows for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Why Stormproof Windows for Exposed Locations
4,000 Pa Wind Resistance
Tested to EN 12210 Class C5 with 4,000 Pa wind pressure - equivalent to sustained winds of 180 km/h (112 mph) or Category 2 hurricane conditions. Reinforced frame option achieves 5,000 Pa (Category 3 equivalent) for the most demanding locations.
Triple-Seal Weather System
Three independent EPDM gasket lines create redundant weather barriers: primary compression seal, secondary labyrinth seal, and tertiary fin seal. Maintains air and water tightness even if one seal is compromised by debris impact or pressure differentials.
316 Marine-Grade Hardware
All fasteners, hinges, handles, and locking points use 316 stainless steel with 2-3% molybdenum for superior chloride corrosion resistance. In coastal zones within 5 km of the sea, 316 maintains integrity for 20+ years while 304 develops surface rust within 2-3 years.
8-Point Multi-Lock
Heavy-duty multi-point locking system with 8–12 locking points prevents sash blowout under negative wind pressure. The lock engages the frame at top, bottom, and both sides simultaneously, distributing wind load evenly across the entire sash perimeter.
Impact-Rated Glazing
Laminated outer lite (6.38–8.38 mm PVB) with toughened inner lite holds glass together if struck by wind-borne debris. Meets Miami-Dade HVHZ and Florida Building Code TAS 201/202/203 impact standards. Prevents breach of the building envelope during hurricanes.
Hurricane Zone Certified
With laminated glass and reinforced frame upgrades, stormproof windows meet Miami-Dade County HVHZ requirements and Florida Building Code standards. Full test reports, NOA (Notice of Acceptance) documentation, and impact certification provided for US projects.
Engineered for the Elements
Standard casement windows are designed for typical weather conditions - moderate wind, occasional rain, and sheltered locations. In coastal regions, exposed hillsides, or hurricane-prone areas, standard windows fail because they are not built to handle sustained pressure differentials, salt-laden air, or wind-borne debris impact. SGL stormproof casement windows are fundamentally different: every component is oversized, over-specified, and tested beyond normal requirements.
The 70 mm frame profile uses 2.0 mm wall thickness aluminium (vs. 1.4 mm standard) with additional internal ribs for torsional rigidity. The thermal break is widened to 34 mm (vs. 24 mm standard) to maintain U-values despite the heavier frame. The triple-seal system is the critical difference: while standard windows rely on a single compression gasket, stormproof units use three independent seals that create redundant barriers against water and air infiltration. Even if driving rain forces past the outer fin seal, the labyrinth and compression seals maintain the weather barrier.
316 Stainless Steel: The Coastal Difference
The hardware is where most coastal windows fail. Salt spray contains chloride ions that penetrate the passive oxide layer on stainless steel, causing pitting corrosion. 304 stainless steel contains 18% chromium and 8% nickel but no molybdenum - it resists atmospheric corrosion but fails in marine environments. 316 stainless adds 2–3% molybdenum, which forms stable molybdenum oxide that blocks chloride attack. SGL stormproof windows use 316 grade for every metal component: hinges, handles, espagnolette rods, locking points, fasteners, and drainage covers. This is not an upgrade - it is standard on every stormproof unit.
Key Features
1. Reinforced 70 mm Frame
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2.0 mm wall thickness with internal rib reinforcement provides torsional rigidity for high wind loads. The 80 mm reinforced option (2.5 mm wall) achieves 5,000 Pa for extreme locations. Both profiles maintain thermal break integrity with 24–34 mm PA66 insulation zones.
2. 8–12 Point Multi-Lock
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Heavy-duty espagnolette with mushroom cams engages at 8 points (standard) or 12 points (reinforced) around the sash perimeter. Prevents negative-pressure blowout during wind gusts. Locking points are 316 stainless steel with anti-corrosion coating.
3. Pressure-Equalising Drainage
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Concealed drainage channels with pressure-equalising weep slots prevent water pooling in the frame rebate. The drainage path is designed to handle 1,050 Pa driving rain (Class E1050) without water crossing the inner seal line.
4. Laminated Impact Glass
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6.38 mm or 8.38 mm PVB laminated outer lite holds shattered glass in place upon debris impact. Meets ASTM E1886 large missile impact test (4.1 kg timber at 15 m/s). The PVB interlayer also provides 35–38 dB acoustic attenuation.
5. AAMA 2604 Coastal Finish
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Powder coating formulated for coastal exposure with enhanced UV stability and salt resistance. 3,000 hours neutral salt spray (NSS) per ASTM B117. Available in RAL, BS, and custom colours with 20-year colour retention warranty in marine environments.
Ideal Applications
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Coastal Residential
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Beachfront Hotels
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Hurricane-Prone Regions
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Offshore Wind Farms
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Exposed Hilltop Properties
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Lighthouse & Coastal Stations
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Island Resorts
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Marina & Harbour Buildings
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Frequently Asked Questions
Q: What wind speed can stormproof casement windows withstand?
A: SGL stormproof casement windows are tested to 4,000 Pa wind pressure (EN 12210 Class C5), equivalent to sustained wind speeds of approximately 180 km/h (112 mph) or Category 2 hurricane conditions. For regions requiring higher ratings, reinforced frames and laminated glass upgrades achieve 5,000 Pa (Category 3 equivalent).
Q: How does the triple-seal system work?
A: The triple-seal system uses three independent EPDM gasket lines: a primary compression seal on the sash closing face, a secondary labyrinth seal on the rebate, and a tertiary fin seal on the outer frame edge. This creates redundant weather barriers that maintain air and water tightness even if one seal is compromised by debris impact or extreme pressure differentials.
Q: Why is 316 stainless steel used instead of 304?
A: 316 stainless steel contains 2-3% molybdenum, providing superior resistance to chloride-induced pitting corrosion from salt spray. In coastal environments within 5 km of the sea, 304 stainless can develop surface rust within 2-3 years. 316 hardware maintains its integrity for 20+ years even in direct marine exposure. All fasteners, hinges, handles, and locking points are 316 grade as standard on stormproof units.
Q: Are stormproof windows suitable for hurricane-prone regions?
A: Yes. With laminated glass and reinforced frame upgrades, SGL stormproof windows meet Miami-Dade County HVHZ (High Velocity Hurricane Zone) requirements and Florida Building Code TAS 201/202/203 impact standards. The multi-point locking system (8-12 points) prevents sash blowout under negative pressure, while the triple-seal maintains water tightness during driving rain at 180 km/h.
Q: What glazing is recommended for exposed coastal locations?
A: For exposed coastal locations, we recommend laminated outer lite (6.38 mm or 8.38 mm PVB) with a toughened inner lite. The laminated layer holds the glass together if broken by wind-borne debris, preventing breach of the building envelope. For hurricane zones, impact-rated laminated glass (meeting ASTM E1886/E1996) is mandatory. Low-E coating should be specified on surface #2 for thermal performance.
Project Case Studies
We provide one-stop door and window solutions for individual buyers, contractors, renovation companies, and more.
Our address
No. 2 Group, Fumiao Village, Laojun Town, Hantai District, Hanzhong City, Shaanxi Province, China
Phone Number
+86 13335450021
sgl-factory@sgl-doors-windows.com
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| Parameter | Specification |
|---|---|
| Frame Profile | 70 mm heavy-duty thermal break aluminium (reinforced 80 mm option) |
| Frame Wall Thickness | 2.0 mm (standard); 2.5 mm (reinforced) |
| Wind Resistance | 4,000 Pa (EN 12210 Class C5); 5,000 Pa (reinforced option) |
| Air Tightness | Class 4 (EN 12207) |
| Water Tightness | Class E1050 (EN 12208) - 1,050 Pa driving rain |
| Seal System | Triple EPDM: primary compression + secondary labyrinth + tertiary fin |
| Hardware Material | 316 stainless steel (all fasteners, hinges, handles, locks) |
| Locking System | 8-point multi-lock (standard); 12-point (reinforced) |
| Glass (Standard) | 6+16A+6 Low-E argon (double); 6+12A+6+12A+6 (triple) |
| Glass (Impact/Hurricane) | 6.38 mm laminated outer + 6 mm toughened inner (Low-E) |
| U-Value (Double) | 1.4–1.6 W/m²K |
| U-Value (Triple) | 1.0–1.2 W/m²K |
| Max Sash Size (W×H) | 1,400 mm × 1,800 mm (standard); 1,600 mm × 2,000 mm (reinforced) |
| Max Sash Weight | 100 kg (standard); 150 kg (reinforced) |
| Surface Finish | AAMA 2604 coastal-grade powder coat; Anodised AA25 marine |
| Corrosion Resistance | 3,000 hours NSS (neutral salt spray) per ASTM B117 |
| Impact Certification | ASTM E1886/E1996; TAS 201/202/203; Miami-Dade HVHZ |
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