4Mm Float Glass
Premium 4mm Float Glass: High Clarity, Durability & Fast Global Delivery
4mm float glass with superior optical clarity, flatness, and strength—ideal for construction, automotive, solar panels, and architectural glazing. SHAHE SHOTT GLASS Co., Ltd. delivers OEM/ODM solutions with 28 years of expertise, competitive pricing, and high-speed logistics from our 20,000sqm factories.
Certified by GB15763.2-2005, CE, ISO 9001 | 20,000+ tons annual capacity
Contents
3 Critical Challenges in Sourcing 4mm Float Glass
Corporate purchasing managers and technical directors face recurring obstacles when procuring 4mm float glass for high-volume projects. Here are the top pain points—and how we address them.
1. Inconsistent Thickness & Flatness
Low-quality suppliers often deliver 4mm float glass with ±0.2mm thickness deviations or warping, causing installation failures in double-glazed units or solar panels. According to the Float Glass Market Report 2025-2030, 34% of buyers cite dimensional inconsistencies as a top rejection reason.
Our Solution: ±0.1mm tolerance guaranteed via Intermac CNC cutting tables and automated quality checks.
2. High MOQs & Inflexible Customization
Many manufacturers enforce 10+ container MOQs for 4mm float glass, forcing buyers to overstock. The Global Flat Glass Market Report 2035 notes that 62% of SMEs struggle with inventory costs due to rigid procurement terms.
Our Solution: 500sqm minimum order, with OEM/ODM design for cut-to-size, edges, and coatings.
3. Unreliable Lead Times & Logistics
4-8 week delays are common due to port congestion or raw material shortages. Grand View Research highlights that 45% of construction projects face timelines extensions from glass supply chain bottlenecks.
Our Solution: 15-day production + 7-day express shipping to US/UE ports via DHL, FedEx, or sea LCL.
Why SHAHE SHOTT’s 4mm Float Glass is the Smart Choice
4mm Float Glass: Supplier Comparison
| Criteria | SHAHE SHOTT | Competitor A (China) | Competitor B (India) | Competitor C (EU) |
|---|---|---|---|---|
| Thickness Tolerance | ±0.1mm | ±0.2mm | ±0.3mm | ±0.15mm |
| MOQ (sqm) | 500 | 3,000 | 5,000 | 2,000 |
| Lead Time (Days) | 15-22 | 30-45 | 40-60 | 25-35 |
| Price per sqm (USD) | $8.50-$12 | $7.50-$10 | $9.00-$14 | $12-$18 |
| OEM/ODM Capability | ✅ Yes (Cut-to-size, coatings, edges) | ❌ Limited | ❌ No | ✅ Yes |
| Certifications | GB15763.2, CE, ISO 9001, FCC | CE, ISO 9001 | ISO 9001 | CE, EN 12150 |
Note: Prices vary based on volume, coatings, and logistics. Contact us for bulk discounts.
5 Reasons to Choose SHAHE SHOTT for 4mm Float Glass
- Unmatched Precision: Our 45m-long tempering furnace and Intermac CNC work centers ensure ±0.1mm thickness tolerance and superior flatness (wave distortion < 0.3mm), critical for IGUs (Insulated Glass Units) and solar panels.
- Full-Service Processing: From raw 4mm float glass to tempered, laminated, or coated end products—all under one roof. As per the Processed Glass Market Report 2035, integrated suppliers like us reduce lead times by 25-40%.
- Cost-Effective Pricing: Leveraging China’s world-class float glass supply chain, we offer 10-15% lower costs than EU suppliers without compromising quality. Bulk orders (10,000+ sqm) qualify for additional discounts.
- Rapid Global Logistics: Strategic partnerships with DHL, Maersk, and COSCO ensure 15-day production + 7-day express delivery to major ports (LA, NY, Rotterdam). LCL options available for smaller orders.
- Technical Support: Our 24/7 engineering team provides DFM (Design for Manufacturing) guidance, 3D drawings, and pre-shipment inspection reports to avoid costly rework.
45m-long tempering furnace for precision processing
Intermac CNC work center ensuring ±0.1mm accuracy
Automated quality checks for flatness and optical clarity
Technical Specifications of 4mm Float Glass
Our 4mm float glass adheres to GB/T 11948-2016 (China), EN 572-2 (Europe), and ASTM C1036 (USA) standards. Below are the key parameters:
1. Thickness & Dimensional Tolerances
| Parameter | Value |
|---|---|
| Nominal Thickness | 4.0mm ±0.1mm |
| Length Tolerance | ±2mm (for sizes ≤ 3,000mm) |
| Width Tolerance | ±2mm (for sizes ≤ 2,500mm) |
| Flatness (Wave Distortion) | ≤ 0.3mm |
| Edge Quality | Smooth, seamed or polished |
2. Optical Properties
| Property | Clear Float Glass | Ultra-Clear Float Glass |
|---|---|---|
| Visible Light Transmittance (4mm) | ≥ 87% | ≥ 91.5% |
| Solar Energy Transmittance | ≥ 82% | ≥ 88% |
| UV Transmittance (300-380nm) | ≤ 10% | ≤ 8% |
| Haze | ≤ 0.3% | ≤ 0.1% |
| Reflectance (Per Surface) | ~8% | ~6% |
Data source: SHAHE SHOTT internal lab tests (2025) | Complies with EN 410 and ASTM E903 standards.
3. Mechanical & Thermal Properties
| Property | Value |
|---|---|
| Density | 2.5 g/cm³ |
| Young’s Modulus | 70 GPa |
| Flexural Strength (Annealed) | ~45 MPa |
| Coefficient of Thermal Expansion | 9 × 10⁻⁶ /°C |
| Thermal Conductivity | 1.0 W/(m·K) |
| Softening Point | ~720°C |
4. Applications of 4mm Float Glass
🏗️ Construction
- Windows & doors
- Curtain walls
- Partitions & railings
- Staircases & balustrades
55% of our 4mm float glass is used in residential and commercial buildings (Source: Architectural Flat Glass Market Report 2033).
🚗 Automotive
- Side & rear windows
- Sunroofs
- EV battery covers
- Head-up displays (HUD)
Ultra-clear variants preferred for ADAS (Advanced Driver Assistance Systems).
☀️ Solar & Renewable Energy
- Photovoltaic (PV) modules
- Solar thermal collectors
- Greenhouse glazing
Ultra-clear 4mm float glass achieves 91.5% transmittance, ideal for solar panels (Ultra-Clear Float Glass Applications Report).
🛋️ Interior & Furniture
- Tabletops & shelves
- Mirror substrates
- Decorative partitions
- Backsplashes
Can be tempered, laminated, or acid-etched for safety and aesthetics.
Frequently Asked Questions About 4mm Float Glass
Still have questions? Explore our FAQ or contact our experts for personalized support.
❓ What is the difference between clear and ultra-clear 4mm float glass?
Clear float glass has a standard iron content, resulting in a greenish tint and 87% light transmittance. Ultra-clear float glass (low-iron) removes iron oxides, achieving 91.5% transmittance and a colorless appearance, ideal for solar panels, high-end architecture, and displays.
❓ Can you supply 4mm float glass with custom coatings (e.g., low-E, reflective)?
Yes! We offer online and offline coating services, including:
- Low-E coatings (thermal insulation)
- Solar control coatings (UV/IR reflection)
- Reflective coatings (mirror-like finishes)
- Anti-glare coatings (for displays)
❓ What are your MOQ and pricing for 4mm float glass?
MOQ: 500 sqm (standard sizes) or 1 container (~30 tons) for bulk orders.
Pricing:
- Clear 4mm float glass: $8.50–$12/sqm
- Ultra-clear 4mm float glass: $12–$18/sqm
- Tempered 4mm float glass: $15–$25/sqm
- Laminated 4mm float glass: $20–$35/sqm
❓ How do you ensure the quality of 4mm float glass?
Our multi-stage quality control process includes:
- Raw material inspection: Float glass sheets checked for bubbles, inclusions, and distortions.
- Automated cutting: Intermac CNC tables ensure ±0.1mm accuracy.
- Edge grinding: Smooth, safe edges with double-edge grinding machines.
- Final inspection: 100% visual and laser flatness checks.
- Third-party testing: Optional EN 572-2, ASTM C1036 compliance reports.
❓ What are your delivery times and shipping options?
Production Lead Time:
- Stock sizes: 7–10 days
- Custom sizes/coatings: 15–22 days
- Tempered/laminated: 20–30 days
- Express (DHL/FedEx): 3–7 days to US/UE
- Air Freight: 5–10 days
- Sea Freight (FCL/LCL): 20–45 days
❓ Do you provide samples for 4mm float glass?
Yes! We offer:
- Free samples: Up to 5 small pieces (300×300mm) for quality evaluation.
- Paid samples: Larger or customized samples (refundable upon bulk order).
- Courier: Shipped via DHL/FedEx (3–5 days delivery).
What Our Customers Say About Our 4mm Float Glass
James Wilson
Senior Architect, GreenBuild Architects (USA)
"We’ve been using SHAHE SHOTT’s 4mm ultra-clear float glass for our luxury residential projects for 3 years. The crystal-clear transparency and consistent flatness make it perfect for floor-to-ceiling windows. Their team also helped us optimize glass sizes to reduce waste by 12%."
Verified Purchase | 5,000 sqm | 2025-03-15
Emily Chen
Procurement Lead, EcoSolar (Canada)
"As a solar panel manufacturer, glass quality directly impacts our efficiency ratings. SHAHE SHOTT’s 4mm ultra-clear float glass has 91.5% transmittance, which boosted our panel output by 3%. Their JIT delivery also keeps our production line running smoothly."
Verified Purchase | 20,000 sqm | 2025-01-28
Raj Patel
Director, GlassCraft India
"We import 4mm float glass from SHAHE SHOTT for our tempered glass production. The ±0.1mm thickness tolerance is unmatched, and their competitive pricing (15% lower than local suppliers) has improved our margins. The only downside is the longer lead time for custom sizes, but it’s worth the wait."
Verified Purchase | 8,000 sqm | 2024-11-10
About the Author
Li Wei | Senior Glass Technologist | SHAHE SHOTT GLASS Co., Ltd.
With 28 years in the glass industry, Li Wei specializes in float glass production, processing, and quality control. He has led R&D for ultra-clear and coated glass and holds a Master’s in Material Science from Tsinghua University. His expertise ensures SHAHE SHOTT’s products meet global standards for construction, automotive, and solar applications.
Ready to Source High-Quality 4mm Float Glass?
Get competitive pricing, fast delivery, and expert support from China’s leading glass manufacturer.
📧 Email: inquiry@chinamirrorglass.com
📍 Address: North Second Row, East Side of Dadong Logistics, Economic Development Zone, Shahe City, Xingtai City, Hebei Province
⏰ Business Hours: Mon-Fri, 8:00 AM - 6:00 PM (GMT+8)
Limited-Time Offer: First-time buyers get 5% off on orders > 10,000 sqm. Free samples available for qualified leads.
Risk-Free Guarantee: 100% refund or replacement for defective products. Quality inspection reports provided before shipment.
4mm float glass with superior optical clarity, flatness, and strength—ideal for construction, automotive, solar panels, and architectural glazing . SHAHE SHOTT GLASS Co., Ltd. delivers OEM/ODM solutions with 28 years of expertise , competitive
-
16AprPremium High Quality Float Glass for Sale and Glass Solutions
When sourcing materials for modern architecture or interior design, finding reliable float glass for sale is essential for achieving both aesthetic brilliance and structural integrity. Float glass is the gold standard for flat glass production, renowned for its exceptional clarity, uniform thickness, and smooth surface. Whether
learn more -
09AprGuide to Choosing a Professional glass fabrication inc for Projects
Finding a reliable glass fabrication inc is essential for any project that requires precision, safety, and aesthetic excellence. Whether you are an architect designing a modern skyscraper, a contractor renovating a luxury home, or a business owner upgrading commercial storefronts, the quality of glass fabrication determines the
learn more -
07AprComprehensive Guide to Custom Glass Fabrication and its Diverse Applications
When it comes to specialized projects, custom glass fabrication is often the only solution. Whether it's for architectural designs, unique furniture pieces, or specialized industrial applications,
learn more
Trusted by Global Leaders | Certified for Quality & Safety
Proudly supplying 4mm float glass to:
Our Certifications
ISO 9001:2015
CE Marking
GB15763.2-2005
FCC (LED Mirrors)
UL (Safety Glass)
Michael Carter
Procurement Manager, PPG Industries
"SHAHE SHOTT’s 4mm float glass consistently meets our optical clarity and flatness requirements for automotive glazing. Their 15-day lead time has helped us reduce inventory costs by 22%."
Sarah Johnson
Supply Chain Director, Tesla
"We switched to SHAHE SHOTT for our EV sunroofs after quality issues with a previous supplier. Their ultra-clear 4mm float glass delivers 91.5% transmittance, and their JIT delivery aligns perfectly with our production."
David Lee
CTO, SolarTech Solutions
"For our high-efficiency PV modules, glass quality is non-negotiable. SHAHE SHOTT’s 4mm ultra-clear float glass has zero defects in 50,000+ sqm shipped. Their OEM coating services also saved us 18% in production costs."