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KINGSTAR GLASS
Clear Float Glass | Standard Architectural Glass with Excellent Clarity from KINGSTAR BUILDING GLASS
KINGSTAR BUILDING GLASS Clear Float Glass is a high-quality, standard architectural glass produced through the float glass process—a method that involves floating molten glass over a bath of molten tin to create a perfectly flat, distortion-free ribbon with uniform thickness and excellent optical clarity. As a fundamental building material in the construction industry, clear float glass offers good visible light transmittance, stable performance, and reliable mechanical strength at an economical
What is Clear Float Glass?
Clear float glass is a soda-lime silicate glass produced by melting a blend of high-quality silica sand, soda ash, limestone, dolomite, and recycled glass at approximately 1,500-1,600°C. The molten glass flows onto a bath of molten tin, where it spreads evenly under the forces of gravity and surface tension to form a perfectly flat ribbon with smooth, distortion-free surfaces. As the ribbon moves forward, it gradually cools and solidifies before passing through an annealing lehr—a long furnace where the temperature is carefully reduced to relieve internal stresses. This process results in 'annealed' glass: a stable, durable, and optically clear product ready for cutting and processing.
Clear float glass is produced in compliance with EN 572-1, EN 572-2, and EN 572-9 standards, and is CE-marked for use in building applications. KINGSTAR BUILDING GLASS clear float glass is available in a full range of thicknesses and can be processed into tempered glass, laminated glass, insulating glass units, bent glass, coated glass, and mirrors.
Key Features
- High Light Transmittance: Visible light transmittance of 89-91% depending on thickness, maximizing natural daylight penetration
- Excellent Optical Clarity: Smooth, distortion-free surfaces with superior flatness
- Superior Thickness Uniformity: Tight thickness tolerance of ±0.05mm ensures consistent performance
- Precise Cutting: Cutting tolerance of ±1mm for accurate dimensional control
- Excellent Color Stability: Consistent appearance with a faint greenish tint characteristic of standard clear glass
- Chemical Stability: Resistant to environmental degradation and chemical exposure
- Versatile Processing: Can be easily cut, drilled, polished, beveled, shaped, tempered, laminated, coated, or bent
- Cost-Effective: Reliable performance at an economical cost
Optical and Solar Performance
Performance Data by Thickness (Clear Float Glass)
| Thickness | Visible Light Transmittance (Tvis) | Visible Light Reflectance (Rvis) | Solar Transmittance (Tsol) | Solar Reflectance (Rsol) | U-Value Winter (W/m²K) | U-Value Summer (W/m²K) | Shading Coefficient (SC) | Relative Heat Gain (W/m²) | Sound Insulation Rw (dB) |
|---|---|---|---|---|---|---|---|---|---|
| 3mm | 90.6% | 8.0% | 86.2% | 7.3% | 5.53 | 5.49 | 1.02 | 561 | 26 |
| 4mm | 90.2% | 7.9% | 85.9% | 7.3% | 5.50 | 5.46 | 1.02 | 550 | 27 |
| 5mm | 90.0% | 7.9% | 85.5% | 7.2% | 5.46 | 5.42 | 1.01 | 540 | 29 |
| 6mm | 89.6% | 7.9% | 84.6% | 7.1% | 5.42 | 5.37 | 1.01 | 523 | 29 |
| 8mm | 89.0% | 7.8% | 82.1% | 6.9% | 5.39 | 5.34 | 0.98 | 510 | 31 |
| 10mm | 88.3% | 7.8% | 76.9% | 6.7% | 5.32 | 5.27 | 0.94 | 497 | 33 |
| 12mm | 87.8% | 7.7% | 75.5% | 6.5% | 5.25 | 5.20 | 0.93 | 480 | 34 |
| 15mm | 86.8% | 7.6% | 72.2% | 6.3% | 5.15 | 5.10 | 0.90 | 457 | 35 |
| 19mm | 85.5% | 7.5% | 68.2% | 6.0% | 5.04 | 4.98 | 0.87 | 459 | 37 |
Data based on CSG Clear Float Glass. Visible light transmittance values may vary slightly by manufacturer. 6mm clear float glass typically provides VLT of approximately 87-89%.
Key Optical Metrics Explained
- Visible Light Transmittance (VLT): The percentage of visible light passing through the glass. Higher values mean more natural daylight.
- Solar Transmittance (Tsol): The percentage of solar energy passing directly through the glass.
- U-Value: Measures heat transfer rate. Lower U-value means better insulation.
- Shading Coefficient (SC): The ratio of solar heat gain through the glass compared to standard 3mm clear glass. Lower values indicate better solar control.
- Relative Heat Gain (RHG): The total heat entering through the glass, combining direct solar transmission and re-radiated absorbed heat.
- Sound Insulation (Rw): Weighted sound reduction index—higher values indicate better acoustic performance.
Technical Specifications
Applications
Architectural & Building Applications:
- Windows and Doors: Residential and commercial fenestration
- Building Facades and Curtain Walls: Standard glazing for commercial buildings
- Skylights and Roof Glazing: Overhead daylighting applications
- Shopfronts and Storefronts: Retail display windows
- Double and Triple Glazing: Base glass for insulating glass units
Interior & Decorative Applications:
- Glass Partitions: Office and interior space division
- Shower Screens and Enclosures: Bathroom applications
- Furniture: Tabletops, shelves, cabinets, display cases
- Mirrors: Base glass for silvered mirrors
- Balustrades and Railings: Interior and exterior safety barriers
Processing & Industrial Applications:
- Substrate for Tempered Glass: Base material for safety glass production
- Substrate for Laminated Glass: Base material for laminated safety glass
- Substrate for Coated Glass: Base material for Low-E, solar control, and reflective coatings
- Substrate for Acid-Etched Glass: Base material for decorative etched glass
- Substrate for Silk-Screen Printed Glass: Base material for decorative printed glass
- Substrate for Mirrors: Base material for silvered mirrors
- Automotive: Windshields and automotive glass applications
- Solar Panels: Cover glass for solar thermal collectors and photovoltaic modules
Why Choose KINGSTAR BUILDING GLASS Clear Float Glass?
- Superior Optical Performance: High visible light transmittance of up to 90.6% (3mm) delivers excellent natural daylighting
- Excellent Thickness Uniformity: Tight tolerance of ±0.05mm ensures consistent performance across every sheet
- Complete Processing Capabilities: Cutting, edging, tempering, laminating, IGU assembly, bending, and coating under one roof—streamlining your supply chain
- Full Thickness Range: Available from 3mm to 19mm—customizable to meet any project requirement
- International Standards Compliance: EN 572 certified and CE marked for building applications
- Versatile Foundation Material: Serves as the base glass for an entire range of value-added glass products
- 10 Years of Industry Expertise: With a decade of dedicated experience in architectural glass manufacturing and export, KINGSTAR BUILDING GLASS has delivered clear float glass solutions to projects across North America, Europe, the Middle East, and Southeast Asia. Our technical team provides expert guidance on glass selection, processing compatibility, and installation requirements.
- Quality Assurance: Strict quality control from raw material selection to final packaging—consistent clarity, uniform thickness, and reliable processing.
Looking for a versatile, cost-effective glass solution for your next project? Share your specifications with our technical team for custom clear float glass solutions. We'll provide optical performance data, processing recommendations, and a competitive quote tailored to your project requirements—backed by a decade of architectural glass expertise.
Frequently Asked Questions (FAQ)
Q1: What is the visible light transmittance of clear float glass?
A: Visible light transmittance varies by thickness. 3mm clear float glass delivers 90.6% VLT; 6mm provides 89.6% VLT; 8mm provides 89.0% VLT; and 19mm provides 85.5% VLT. Standard clear float glass retains a faint greenish tint from iron oxide content in the raw materials—a characteristic that becomes more noticeable as thickness increases. For applications requiring maximum clarity without any green tint, low-iron float glass is recommended.
Q2: What are the main applications of clear float glass?
A: Clear float glass is one of the most versatile glass products available. Architectural applications are extensive—commonly used for windows, facades, skylights, curtain walls, and shopfronts, allowing maximum daylight penetration while providing clear outward visibility. It is also widely used as the substrate for specialized glazing such as reflective, tinted, and low-emissivity (Low-E) glass, forming the backbone of energy-efficient façade systems. In interior design, it is used for glass partitions, tabletops, cabinets, mirrors, shelving, and balustrades. Beyond architecture, it serves as base material for laminated safety glass, solar panels, automotive windshields, and display glass.
Q3: Can clear float glass be tempered, laminated, or coated?
A: Yes. KINGSTAR BUILDING GLASS clear float glass is fully compatible with tempering (EN 12150), laminating (EN ISO 12543), and insulating glass unit fabrication. It can also be heat-strengthened, bent, coated, silvered, sandblasted, or acid-etched. Clear float glass is often used as a base glass for an entire range of glass products including mirrors, acid-etched glass, tempered and laminated glass, safety and security glass, coated glass such as solar-control glass and insulating glass, and double glazing and triple glazing units. Its versatility and ease of fabrication make it the preferred choice as a base material for advanced processing.
Clear Float Glass is made by high-quality sand, natural ores and chemical materials by mixing them and melting them at high temperature. The molten glass flow into tin bath where the float glass is spread, polished and formed on the molten tin. The float glass has smooth surface, excellent optical performance, stable chemical capability, and high mechanism intensity. It is also resistant to acid, alkali and corrosion.
High transmittance, excellent optical performance.
Smooth and flat surface, visible flaw is controlled strictly
Easily to be cut, insulated, acid-etched, lacquered, tempered and coated.
Normal Thickness: 3mm, 4mm, 5mm, 5.5mm, 6mm, 8mm, 10mm, 12mm
Sizes: 1524x2134mm, 1220x1830mm, 1650x2140mm, 1830x2440mm, 2134x3300mm, 2250x3300mm, 2440x3300mm, 2140x3660mm, 2440x3660mm, etc. can be produced according to client’s request.
Clear Float Glass can be used in a wide range of applications, from interior furniture to all-glass structural facades
Windows, doors and facades on various buildings, Interior applications for furniture or decorations
Mirror making, Automotive window shields Instruments
Kingstar Building glass: www.kingstar-glass.com
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Kingstar Building glass:
Email: eric@kingstar-glass.com
Kingstar Glassware
(Professional Glassware & Kitchen Storage):
Email: info@kingstar-glass.com
Address: NO.101 SHENZHEN ROAD, QINGDAO, CHINA
© 2022 Qingdao Kingstar Glass Co., Ltd . All rights reserved Site Map | Technical Support:weidongli
Building glass:
Wechat/Whatsapp: 008618562697682
Email: eric@kingstar-glass.com
Glassware please visit: www.kingstarliving.com
Wechat/Whatsapp: 008615063091883
Email: info@kingstar-glass.com
Address: NO.101 SHENZHEN ROAD, QINGDAO, CHINA
© 2022 Qingdao Kingstar Glass Co., Ltd . All rights reserved Site Map
