Ordinary Float Glass — Clear Float Glass 1.6–25mm | MONTAG

Ordinary float glass — also known as clear float glass or annealed glass — is the foundational flat glass product manufactured through the advanced float process. Renowned for its exceptionally flat surface, uniform thickness, and reliable optical performance, it serves as the primary substrate for all types of further-processed glass. Compared to specialized functional glass, its strength lies in versatility and adaptability — like a blank canvas, it can be transformed through tempering, lamination, coating, or insulation to meet diverse performance requirements.

MONTAG supplies ordinary float glass in thicknesses from 1.6mm to 25mm, with standard sizes including 1830×2440mm and 2134×3050mm (maximum 6000×3200mm). All products undergo strict quality control with uniform chemical composition and consistent optical clarity. Serving deep-processing manufacturers, building material distributors, and industrial product manufacturers worldwide.

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What Is Ordinary Float Glass?

Ordinary float glass is the backbone of the glass industry, born from the revolutionary float process that redefined flat glass manufacturing. The principle is elegantly simple yet technically precise: molten glass (heated to approximately 1500°C) is continuously poured onto the surface of molten tin in a sealed furnace. Due to the high density and flatness of molten tin, the glass spreads evenly, forming a naturally smooth, flat surface without the need for grinding or polishing. This process ensures exceptionally flat and smooth surfaces with no optical distortion — objects viewed through the glass retain their true shapes and proportions without blurring or warping.

As a fundamental glass material, ordinary float glass features uniform chemical composition (primarily silica, with small amounts of sodium oxide, calcium oxide, and other additives) and stable quality. Strict quality control during production ensures consistent thickness, density, and transparency across every glass sheet, minimizing defects such as bubbles, inclusions, or scratches. For B2B deep-processing manufacturers, this stable optical performance and flat surface directly improve processing efficiency and product yield rates.

Key characteristics of ordinary float glass:

• Light transmittance 89–90% — clear visibility for architectural and industrial applications
• Thickness range 1.6mm–25mm — covers lightweight decorative to heavy structural applications
• Exceptionally flat surface — no optical distortion, ideal as substrate for deep processing
• Uniform chemical composition — consistent quality minimizes processing defects
• Excellent processing compatibility — can be tempered, laminated, coated, or assembled into insulating units

For large-scale projects and batch production clients, our standardized production ensures consistent quality across orders, with flexible specifications to meet diverse manufacturing requirements.

Performance Specifications

These specifications translate directly to manufacturing outcomes: consistent flatness and optical quality mean higher cutting yields and fewer rejected panels during downstream processing. At 89–90% light transmittance with ±0.2mm thickness tolerance, ordinary float glass provides the reliable substrate that deep-processing manufacturers need — whether for tempering lines, laminating lines, or coating lines. For high-volume B2B buyers, stable quality across large orders reduces material waste, improves production line efficiency, and lowers overall manufacturing costs.

Thickness Guide & Applications

This thickness range covers most architectural, furniture, and industrial requirements. For specialized applications requiring safety performance, ordinary float glass can be tempered, laminated, or otherwise processed. For projects requiring enhanced safety, see our tempered glass product line. For sound insulation and UV protection, see our laminated glass products.

Deep-Processing Compatibility

While ordinary float glass has relatively basic inherent performance — its strength is limited compared to tempered glass, and it lacks built-in thermal insulation, sound insulation, or safety properties — it excels in compatibility with various deep-processing technologies. This adaptability is its most valuable characteristic, enabling transformation into high-performance glass products for specific needs:

• Tempering: Through high-temperature heating and rapid cooling, float glass becomes tempered glass with 3–5 times the impact and bending strength of ordinary glass, breaking into blunt-edged granules for enhanced safety.
• Lamination: Under high temperature and pressure, PVB/SGP/EVA interlayers bond glass sheets into laminated glass, preventing fragment scattering and providing sound insulation and UV protection.
• Coating: Low-emissivity, anti-reflective, or self-cleaning coatings can be applied to create energy-efficient, light-controlling, or easy-maintenance glass products.
• Insulating glass assembly: Combined with spacers and sealants to form insulating glass units (IGUs), delivering thermal and acoustic insulation for architectural doors and windows.

For B2B deep-processing manufacturers, this broad compatibility effectively expands product lines and meets diverse market demands from a single reliable substrate.

Customization Options

Beyond standard clear float glass, we offer:

• Custom dimensions — cut-to-size sheets matched to your production line specifications, maximizing material utilization and minimizing waste
• Thickness customization — special thicknesses within the 1.6–25mm range for specific application requirements
• Edge processing — smooth ground, polished, beveled, or arrised edges to deep-processing specifications
• Bulk cutting service — high-precision batch cutting for large-volume orders with consistent dimensional accuracy
• Ultra-clear substrate option — low-iron float glass with higher transmittance for applications requiring eliminated green tint

Applications

The applications of ordinary float glass span broadly across architectural, furniture, and industrial sectors:

• Architecture — base material for windows, doors, curtain walls, glass railings, and skylights (processed for safety and energy efficiency)
• Furniture — tabletops, cabinet doors, shelving, and mirror substrates for residential and commercial furniture
• Appliance industry — oven doors, refrigerator shelves, equipment panels, and observation windows
• Automotive — substrate for automotive glass (bent and tempered for vehicle windows)
• Industrial manufacturing — electronic device screens, equipment viewports, and precision-cut components
• Deep-processing input — primary substrate for tempering lines, laminating lines, coating lines, and IGU assembly

Project Examples:

Tempering line supply — 5mm clear float glass in 1830×2440mm sheets, monthly volume 200+ tons for a regional tempered glass manufacturer, consistent thickness tolerance ensuring stable tempering furnace performance.

Curtain wall project — 8mm float glass cut to custom sizes for a 15-story commercial building, processed into laminated units on-site for safety compliance.

Furniture export manufacturer — 4mm float glass for wardrobe door panels, just-in-time delivery supporting assembly line production with zero material shortage incidents.

For applications requiring safety certification, see our tempered glass. For sound insulation and security, see our laminated glass. For solar energy applications, see our solar glass.

B2B Order Information

Storage & Handling Guidelines

Proper storage and handling preserve the quality of float glass before processing:

• Store glass racks in dry, well-ventilated areas — moisture between stacked sheets can cause surface staining (weathering)
• Use interleaving paper or powder between sheets for long-term storage to prevent surface adhesion and scratching
• Handle with clean gloves — skin oils and acids can mark the glass surface over time
• Transport on purpose-built A-frame racks with proper securing — prevent shifting and edge chipping during transit
• For B2B batch clients, we provide standardized storage and handling guidelines to maintain material quality from delivery to processing

FAQ

What is the difference between ordinary float glass and tempered glass?

Ordinary float glass is the base product — flat, clear, and untreated. Tempered glass is produced by heating float glass to approximately 650°C and rapidly cooling it, creating internal compressive stress that makes it 3–5 times stronger and causes it to break into small, safe granules rather than sharp shards. Ordinary float glass is the raw material input for the tempering process.

Why does ordinary float glass have a slight green tint?

The green tint comes from iron oxide impurities naturally present in the silica sand used in glass production. This is normal and does not affect optical performance for most applications. For applications requiring maximum clarity (such as display cases or high-end storefronts), ultra-clear low-iron float glass eliminates the green tint entirely.

Can ordinary float glass be used directly in windows?

Yes, but with limitations. Ordinary float glass can be used in non-safety applications such as picture frames, cabinet doors, or interior windows. For building doors, windows in occupied spaces, and areas requiring safety glazing, building codes typically require tempered or laminated glass. Ordinary float glass is primarily a substrate for further processing rather than an end product for safety-critical applications.

What sizes are available for bulk orders?

Standard sizes include 1830×2440mm and 2134×3050mm, with maximum single-sheet dimensions of 6000×3200mm. Custom cutting to your production line specifications is available. For B2B clients with specialized needs, we offer cut-to-size services to optimize material utilization and reduce waste.

What is the lead time for bulk orders?

Standard specifications have short lead times due to continuous float production. Custom sizes and large-volume orders are scheduled to match your manufacturing cycle. Contact us with your project requirements for a detailed production and delivery timeline.

Need a quote for your project?

Send us your specifications or production requirements — our team responds within 24 hours with pricing, lead time, and technical recommendations.