Direct Factory Catalog
Featured Aluminium Interior & Commercial Door Systems
Engineered for high-end residential lofts, corporate partitions, commercial entrances, and specialized architectural applications.
Structural Engineering Analysis
The Technical Evolution of Crittall-Style Interior Doors: Transitioning from Steel to Extruded Aluminium Alloys
Why modern global architectural firms and interior designers are replacing legacy hot-rolled steel with precision-extruded 6063-T5 aluminium profile systems for interior partitions.
The iconic aesthetic of Crittall doors—characterized by slim steel framing, geometric grid glazing bars (muntins), and industrial elegance—originates from 19th-century blacksmithing. However, legacy mild steel profiles present significant engineering challenges for contemporary commercial and residential interiors: extreme structural weight requiring heavy floor reinforcement, susceptibility to atmospheric oxidation, acoustic reverberation, and rigid manufacturing parameters that escalate lead times and costs.
Leading Chinese fenestration manufacturers like Changsha Wincraft Aluminum Window Tech Co., Ltd. have re-engineered this classic design using high-tensile extruded aluminium alloys (6063-T5 / 6063-T6). This innovation provides architects and wholesale procurement buyers with identical micro-thin sightlines while drastically reducing structural load, enhancing acoustic dampening, and eliminating rust risks permanently.
| Engineering Parameter | Traditional Hot-Rolled Steel Crittall | Wincraft Precision Extruded Aluminium Crittall | Technical Advantage & B2B Benefit |
|---|---|---|---|
| Structural Density & Weight | 7,850 kg/m³ (Heavy floor dead load) | 2,700 kg/m³ (~65% Weight Reduction) | Easier handling, lower container shipping freight, reduced structural floor load. |
| Profile Sightlines (Elevation) | 15mm – 25mm visible face | 15mm – 20mm ultra-slim sightlines | Achieves ultra-minimalist grid proportions without sacrificing structural rigidity. |
| Corrosion & Humidity Resistance | Requires galvanized priming; prone to rust in humid zones. | Naturally corrosion-free; Qualicoat powder coating | Ideal for high-humidity bathrooms, coastal villas, and luxury spa environments. |
| Acoustic Insulation (Rw Rating) | 24 dB – 28 dB (Single glazing default) | 32 dB – 42 dB (Acoustic laminated double glazing) | Superior speech privacy for executive boardrooms, quiet bedrooms, and home offices. |
| Muntin Grid Construction | Hand-welded solid bars (high cost, permanent layout) | True Divided Lites (TDL) or Applied Astragal Bars | Flexible grid layout customization; cost-effective batch production. |
| Manufacturing Lead Time | 10 – 16 Weeks (Labor intensive) | 4 Weeks Standard (CNC Machined Automated Line) | Fast project turnaround for commercial fit-outs and residential developments. |
Manufacturing Integrity
Architectural Engineering Specifications & Material Breakdown
Understanding the exact component specifications that dictate structural performance, acoustic ratings, and long-term durability in OEM internal door manufacturing.
Alloy Metallurgy & Extrusion Precision
We utilize prime-grade 6063-T5 aluminum extrusions with profile wall thicknesses ranging from 1.5mm to 2.5mm. T5 heat treatment delivers optimal tensile strength and surface smoothness, preventing frame deflection in full-height 3-meter internal partition walls.
Acoustic Glazing & Safety Glass Options
Configurations range from 5mm-8mm single tempered safety glass to 6.38mm-10.38mm acoustic PVB laminated glass. Decorative architectural options include fluted reeded glass, smoked bronze glass, frosted privacy glass, and ultra-clear low-iron glass compliant with BS EN 12150 & ANSI Z97.1.
Surface Treatment & Powder Coating
All frames undergo multi-stage chromate pre-treatment and electrostatically applied Qualicoat Class 1 & Class 2 powder coating (AkzoNobel / Jotun resins). Finishes include Matt Jet Black (RAL 9005), Architectural Bronze, Textured Sand, and custom anodized satin finishes resisting scratches and UV degradation.
Glazing Bar (Muntin) Engineering
Choose between Applied Astragal Grid Bars (precision CNC laser-cut aluminum bars bonded to glass faces with structural 3M VHB tape) for cost efficiency, or True Divided Lites (TDL) featuring individual glass panes supported by structural aluminum transoms for heavy commercial traffic.
Hardware & Locking Architecture
Integrated with premium concealed pivot hinges, soft-closing sliding track systems, magnetic latch mortise locks, flush pulls, and minimalist lever handles. Hardware finishes can be color-matched to door frames or contrasted in brushed brass and matte nickel.
EPDM Perimeter Weatherstripping
Continuous dual-density EPDM rubber seals inserted into extruded frame channels prevent air leakage, mitigate metallic contact noise during door closure, and stabilize glass panels against acoustic vibration.
Industry Horizon
Future Sourcing & Procurement Trends for Internal Crittall Doors
Market intelligence for importers, commercial project buyers, and distributors preparing for upcoming building regulations and interior design shifts.
1. Ultra-Slim Sightline Evolution (<15mm)
Rising consumer demand for uninterrupted light transfer is driving profile faces below 15mm. Advanced structural glass bonding techniques allow aluminum frames to act as minimalist cladding over load-bearing structural glass edges.
2. Recycled Alloys & Low-Carbon Extrusions
European and North American procurement standards increasingly mandate low-embodied-carbon building products. Leading Chinese extrusion mills are adopting 75%+ post-consumer recycled billet aluminum powered by hydro-energy sources.
3. Smart Electrochromic & Switchable Glass
Interior Crittall partitions are shifting from static glass to dynamic Smart PDLC Film Glass. At the touch of a button or via smart home integration, clear glass grids instantaneously switch to opaque frosted privacy walls in executive suites.
4. Enhanced Acoustic Decibel Certification
Post-pandemic workplace design prioritizes quiet acoustic zones within open-plan offices. Demand is accelerating for internal Crittall door systems certified to drop noise levels by 38dB to 45dB, utilizing heavy acoustic PVB interlayers.
5. Modular Flat-Pack & Rapid Assembly KD Kits
To reduce ocean container freight costs and transit damage, B2B procurement is transitioning to pre-machined Knock-Down (KD) assembly kits. Precision CNC mitered joints enable localized site assembly in less than 30 minutes per frame set.
6. Anodized Metallic & Biophilic Finishes
While matte black remains dominant, architectural specifications are expanding into Champagne Gold, Brushed Rose Copper, Olive Bronze, and textured wood-grain sublimated aluminum finishes for luxury residential projects.
Enterprise Advantages
Changsha Wincraft Manufacturing Capabilities & Export Infrastructure
Your end-to-end OEM/ODM manufacturing partner for custom aluminum windows, doors, sunrooms, and architectural partition systems.
20+
Years Industry Excellence
20,000㎡
Modern Production Base
80+
Countries & Regions Exported
24h
Shop Drawing Turnaround
Changsha Wincraft Aluminum Window Tech Co., Ltd. is a premier integrated manufacturer and global exporter of high-grade fenestration solutions. Operating from a state-of-the-art 20,000 m² facility equipped with automated double-head CNC cutting saws, multi-axis machining centers, and automated corner crimping lines, Wincraft ensures exact dimensional tolerances across large-scale commercial orders.
We provide full-spectrum OEM and ODM cooperation models: from custom profile extrusion die development and hardware customization to private-label export packaging. Our in-house structural facade engineers work directly with international architects, contractors, and building material importers to deliver fully approved CAD shop drawings and 3D renderings within 24 hours.
Automated CNC Profile Processing Workshop
Precision Aluminium Profile Extrusion Milling
Systematic Door & Window Frame Assembly
Rigid Pre-Shipment Quality Inspection
Export-Grade Protective Wooden Crate Packaging
Architectural Villa Fenestration Project
Trade Purchasing Guide
Frequently Asked Questions (FAQ) for B2B Buyers & Importers
Essential technical and commercial information for purchasing agents, architects, and building material distributors sourcing from China.
Why should architectural buyers select Aluminium Crittall doors over traditional steel systems?
Aluminium Crittall-style doors offer significant advantages over steel: they weigh up to 65% less, eliminating structural floor load concerns in retrofit projects; they are naturally immune to rust and atmospheric corrosion, making them suitable for high-humidity areas like bathrooms and coastal villas; and they can be finished with architectural powder coatings (Qualicoat) in any RAL color without the risk of paint flaking. Furthermore, aluminium extrusion technology allows for highly precise acoustic gasket channels, resulting in superior sound insulation (Rw ratings up to 42dB).
What is the Minimum Order Quantity (MOQ) and production lead time for custom Crittall orders?
We accommodate both project-based orders and bulk distribution wholesale. Our standard Minimum Order Quantity (MOQ) is 10 square meters or 1 complete container set for mixed product lines. Standard production lead time is 4 weeks (28 calendar days) from final CAD shop drawing sign-off and deposit receipt. For large-scale commercial real estate developments, batch shipments can be staggered according to your site installation timeline.
Can Wincraft provide CAD drawings and 3D architectural renderings prior to mass production?
Yes. Our dedicated engineering department provides comprehensive pre-production technical support. Upon receiving your rough structural opening dimensions, hand sketches, or architectural floor plans, we generate 24-hour design proposals and 3D renderings. Once finalized, we issue complete CAD shop drawings—detailing frame sections, mullion profiles, glass build-up, and anchoring details—for formal client approval before cutting aluminum extrusions.
What international glass safety standards and quality certifications do your products comply with?
All toughened and laminated safety glass units integrated into Wincraft doors strictly comply with international glazing codes, including BS EN 12150 (Europe), AS/NZS 2208 (Australia/New Zealand), and ANSI Z97.1 / ASTM C1048 (USA). Our aluminum profile extrusions meet GB/T 5237 / EN 755 structural standards, and powder coating processes hold Qualicoat Class 1 & Class 2 certifications.
How are glass door units packaged to guarantee zero transit damage during sea freight shipping?
We utilize heavy-duty export packaging engineered for international ocean transport. Aluminum frames are wrapped in anti-scratch protective plastic film, fitted with impact-resistant foam corner guards, and encapsulated in multi-layer bubble wrap. Assembled doors or loose glass units are secured inside fully enclosed, fumigated solid plywood crates with internal steel strapping and shock-absorbing foam lining, guaranteeing safe arrival at your port or job site.
Do you support OEM and ODM private labeling for commercial door brands and wholesalers?
Yes. We specialize in OEM and ODM manufacturing partnerships for global distributors, fenestration brands, and large-scale builders. This includes customized extrusion profile design, custom hardware branding, custom-printed cardboard boxes, customized protective film with your logo, and specialized system engineering tailored to your regional market's building code requirements.
What internal door configurations are available in the Crittall profile series?
Our aluminium Crittall system can be engineered into virtually any interior spatial configuration: Single & Double Swing French Doors (with concealed pivot hinges or side butts), Single & Multi-Track Pocket Sliding Doors, Heavy-Duty Top-Hung Barn Sliding Partitions, Bi-Folding Glass Accordion Walls, Fixed Floor-to-Ceiling Screen Partitions, and Integrated Door-with-Side-Lite transom combinations.
How do we initiate a trade inquiry and request a factory-direct wholesale quotation?
Initiating a quote is simple: click the inquiry button below to connect directly with our technical sales managers. Share your project drawings, door schedules, or required quantity list. Our engineering team will review your specifications, confirm structural feasibility, provide a itemized FOB/CIF quotation, and deliver 24-hour CAD shop drawings for your project.
Ready to Source High-Performance Aluminium Crittall Doors Factory-Direct?
Get direct access to Chinese manufacturing pricing, 24-hour CAD shop drawings, and specialized technical guidance from our Senior Fenestration Engineers.