Engineered for extreme thermal insulation, structural rigidity, and international architectural compliance.
Providing world-class B2B fenestration manufacturing, strict quality control protocols, and custom architectural solutions.
Established in 2014, Grandex Door Solutions Co., Ltd. stands at the forefront of high-precision fenestration manufacturing, operating out of a state-of-the-art 35,000 m² modern production facility. Backed by over 16 years of core industry expertise and 8 years of dedicated global export experience, Grandex generates an annual export volume exceeding USD 28 million. Grounded in robust OEM and ODM trade backgrounds, our high-performance vinyl windows, uPVC profile systems, and exterior entry doors primarily serve real estate developers, commercial contractors, and top-tier building material distributors across North America, Australia, and Western Europe.
Our supply chain architecture is integrated with over 1,200 specialized supply chain partners, guaranteeing uninterrupted raw material quality and component precision. Quality assurance is deeply embedded within our manufacturing DNA: an in-house team of 45 dedicated QA/QC engineers enforces strict ISO 9001 standard testing alongside independent third-party laboratory accreditations (NFRC, Florida NOA, Intertek, and AAMA). Driven by an agile R&D unit featuring 85 specialized structural and mechanical engineers, Grandex introduced 120 advanced door and window configurations last year alone, offering tailor-made architectural solutions covering structural dimensions, multi-point lock hardware integration, UV-resistant surface foil wrapping, and high-performance decorative glass units.
Information Gain Analysis: Why Unplasticized Polyvinyl Chloride (uPVC) Outperforms Traditional Framing.
Grandex vinyl profile systems utilize a proprietary blend of high-impact unplasticized PVC enriched with micro-milled Titanium Dioxide ($TiO_2$) for superior UV stability. Compliant with ASTM D4216 standards, our profile extrusions resist chalking, cracking, and thermal yellowing even under high solar irradiation environments across North American Sunbelt and coastal regions.
Our window profiles incorporate 5 to 7 internal dead-air chambers engineered using Finite Element Thermal Modeling (FEM). This internal geometry creates a thermal break that minimizes conductive heat transfer, enabling overall window U-Factors as low as 0.18 to 0.22 BTU/h·ft²·°F when combined with triple Low-E insulated glass units.
To satisfy demanding Design Pressure (DP) and structural wind load specifications (DP50 to DP90), every Grandex vinyl window sash and frame is embedded with heavy-gage, hot-dipped galvanized steel reinforcement channels. This hybrid strength architecture ensures zero structural deflection under high wind loads.
| Performance Metrics | Grandex uPVC Vinyl Windows | Standard Thermally Broken Aluminum | Traditional Softwood Frames |
|---|---|---|---|
| Thermal Conductivity (U-Factor Range) | 0.18 – 0.26 W/m²K (Superior Thermal Insulation) | 0.32 – 0.45 W/m²K (Moderate Heat Conduction) | 0.28 – 0.38 W/m²K (High Maintenance Required) |
| Condensation Resistance Factor (CRF) | 68 – 75 (High resistance against thermal sweating) | 45 – 55 (Susceptible at low ambient temperatures) | 55 – 62 (Vulnerable to moisture decay) |
| Air Infiltration Rating (ASTM E283) | < 0.04 cfm/ft² (Hermetically Sealed Systems) | < 0.12 cfm/ft² | < 0.20 cfm/ft² |
| Structural Wind Load (ASTM E330) | Up to DP+90 / -90 PSF (Impact/Hurricane Grade) | Up to DP+75 PSF | Up to DP+40 PSF |
| Maintenance Cycle & Lifespan | 35+ Years (Zero painting, impervious to salt rot) | 20-25 Years (Finish oxidation over time) | 10-15 Years (Requires periodic re-staining) |
Customized window and door engineering tailored to diverse international construction requirements.
High-density urban multi-family housing projects demand superior Sound Transmission Class (STC) ratings alongside high energy performance. Grandex single-hung, double-hung, and sliding vinyl windows are engineered with dual-seal EPDM weatherstripping and asymmetrical laminated glass configurations, achieving STC ratings up to 38 dB. This acoustic dampening drastically reduces exterior traffic noise, creating premium interior living spaces for urban tenants.
For coastal developments subject to severe hurricanes and tropical storms, Grandex impact-resistant uPVC windows feature SentryGlas® (SGP) and PVB interlayers combined with heavy-duty structural vinyl frames. Certified under Florida Notice of Acceptance (NOA) and Texas Department of Insurance (TDI) criteria, these windows withstand windborne debris impact from large missile testing (ASTM E1996) and extreme cyclic pressure loading.
Transparent automation from raw material incoming inspection to automated CNC milling and performance testing.
Grandex operates an advanced automated manufacturing grid where human expertise merges with high-precision CNC machinery. Below is a real-time operational overview of our manufacturing equipment, automated assembly lines, and rigorous internal quality control checkpoints:
Raw Materials Store
Sawing Workshop
Milling Section
CNC Milling Station
CNC Precision Drilling
CNC Machining Center
Automated Profile Cutting
Intelligent Sorting System
Final QC & Protective Packing
Heavy Duty Sawing Equipment
High-Speed Milling Machine
Digital CNC Milling Center
Multi-Axis CNC Drilling
Integrated Processing Center
Precision Double-Head Mitre Saw
Automated Conveyor Sorting
In-Line Quality Checkpoints
Air, Water & Structural Tester
Meeting and exceeding building codes across North America, Europe, and Oceania.
Tested under National Fenestration Rating Council (NFRC) guidelines. Our products deliver certified U-Factor, Solar Heat Gain Coefficient (SHGC), and Visible Transmittance (VT) numbers recognized for ENERGY STAR® qualification across all US climate zones.
Full compliance with Australian Standards for windows and doors in buildings. Rated for housing structural deflection, air infiltration, water penetration resistance (up to 450Pa), and glass selection per AS1288 safety code requirements.
Adhering to European Union harmonized standards for windows and external pedestrian doorsets. Our products pass strict acoustic isolation, thermal efficiency, and dangerous substances release regulations for EU market importation.
Optimizing Total Cost of Ownership (TCO), Containerization, and Factory-Direct Lead Times.
Grandex provides complete turn-key custom engineering for global distributors. From custom extrusion dye designs and color co-extrusion (ASA/PVC co-extrusion technology) to customized nail fin depths (J-channel integrated frames for North American timber stud framing), our 85 R&D engineers translate architectural drawings into production CAD/CAM workflows within 48 hours.
To mitigate breakage during ocean transport, every window frame is wrapped in protective scratch-proof film, corner-protected with high-density EVA foam, and strapped onto steel-reinforced export pallets. Our logistics engineers utilize 3D container loading software to optimize spatial density, reducing per-unit freight costs by up to 18%.
Expert insights regarding vinyl window procurement, material performance, and factory standards.
Complete certified windows portfolio for modern homes, commercial villas, and residential developments.
Grandex Door