China Float Glass Specifications and Buying Guide

China float glass is flat, annealed glass formed by floating molten glass on a bath of molten tin. For buyers, the most important specifications are thickness, sheet size, dimensional tolerance, appearance, applicable standard, and whether the glass will be processed after delivery. Common nominal thicknesses include 2–19 mm, but availability and tolerances vary by supplier and product. Use this guide to build a clear specification and compare quotations on equivalent terms.

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Key Takeaways

• Specify the intended application, nominal thickness, finished dimensions, quality requirements, and applicable standard before requesting a quotation.
• Confirm whether you need annealed float glass or a processed product such as tempered, laminated, coated, or insulated glass.
• Request written confirmation of tolerances, packing, quantity, lead time, and shipping terms for each order.
• For preliminary weight estimates, ordinary glass is commonly calculated at approximately 2.5 kg per square metre per millimetre of thickness; confirm final handling requirements with your project team.

Who This Guide Is For

This guide is for importers, distributors, fabricators, contractors, and project procurement teams sourcing building glass from China. It is useful whether you are buying clear float glass for further processing or comparing specifications for a commercial building project. The final specification should always match the design, local building requirements, and the capabilities of the selected processor or supplier.

What China Float Glass Means

Basic process and product form

In the float process, molten glass passes over molten tin, where it forms a flat ribbon with generally smooth surfaces. After controlled cooling, the annealed ribbon is inspected and cut into sheets or other agreed sizes. The standard product is annealed glass, not automatically tempered, laminated, or certified for a particular building application.

Float glass is a base material used in windows, façades, partitions, doors, furniture, and other building products. It can also be supplied as a starting point for downstream processing, subject to the processor’s equipment and the buyer’s requirements. If a project requires safety glazing, thermal performance, or a specific appearance, identify that requirement rather than assuming ordinary float glass will provide it.

Types and Specification Overview

Common product options

• Clear float glass: A general-purpose option for applications where a neutral appearance is required.
• Extra-clear glass: Intended for projects seeking reduced green tint compared with standard clear glass; confirm the available product and visual expectations with the supplier.
• Tinted float glass: Colour is introduced into the glass composition, with shade and light transmission dependent on the selected product.
• Processed glass: Float glass can be further processed into products such as tempered or laminated glass, if the required processing is available and specified.

Specifications to include in a request

A useful inquiry states the product type, nominal thickness, sheet dimensions, quantity, and intended use. It should also describe acceptable appearance, edge or cutting requirements, packing method, and any required inspection or documentation. Ask the supplier to identify the applicable product standard and confirm the relevant tolerances in the quotation or technical documents.

Thickness is commonly discussed in millimetres, with options such as 2, 3, 4, 5, 6, 8, 10, 12, 15, and 19 mm available in many supply channels. This list is indicative, not a guarantee that every thickness, size, or colour is available for every order. Ask for confirmation of the actual product range and dimensional tolerances before placing a purchase order.

Match the Glass to the Application

For windows and façade systems, coordinate glass thickness and makeup with the project’s structural, thermal, acoustic, and safety requirements. Annealed float glass may be an input material, but a design may require tempered, laminated, coated, or insulated glazing instead. Ask the project designer or qualified façade professional to confirm the glass build-up and applicable requirements.

For interior partitions, furniture, and decorative uses, appearance, edge finishing, size, and processing compatibility may be key purchasing factors. Large sheets can reduce the number of joints in some designs, but they also affect handling, transport, and fabrication planning. Share the final dimensions and processing sequence with the supplier and fabricator before confirming an order.

A Practical Selection Framework

1. Define performance before product

Start with the building application and the performance requirements in the project documents. Identify whether the glass is exposed to wind loads, human impact, temperature differences, or other conditions that influence the required product. Do not select a thickness based only on a general-purpose catalogue description.

2. Confirm material and processing

Decide whether the order is for annealed float glass or a finished, processed product. If further processing will happen after import, confirm that the glass dimensions, quality, and packing suit the receiving facility. If processing is expected from the supplier, list each operation and acceptance requirement separately.

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3. Make quotations comparable

Send the same written specification to each supplier and request quotations using the same quantity, packing, delivery destination, and trade terms. Ask suppliers to state what is included and excluded, including cutting, processing, packaging, and documentation. Compare the confirmed specification and total sourcing cost rather than relying on a unit price without context.

4. Verify before production and shipment

Review the order confirmation against the approved specification, including thickness, sizes, quantity, product type, and packing. Agree on the inspection approach and the documents needed for your shipment before production begins. For a first order or a specification with tight visual requirements, discuss sample approval or a suitable pre-shipment inspection arrangement.

Pricing, MOQ, and Lead Time

China float glass pricing depends on factors such as product type, thickness, dimensions, order quantity, processing, packing, destination, and market conditions. Minimum order quantity and production lead time are supplier- and order-specific, so they should be confirmed in a written quotation rather than assumed from a general guide. Include the delivery destination and preferred shipping terms when requesting pricing so that offers can be compared more accurately.

Weight is also relevant to inland transport, container planning, and site handling. A commonly used preliminary estimate for ordinary glass is about 2,500 kg/m³ in density, equivalent to approximately 2.5 kg/m² for each 1 mm of thickness. This is an estimate for planning; the actual shipment weight depends on dimensions, product makeup, packaging, and the supplier’s packing list.

Supplier Evaluation Checklist

• Can the supplier confirm the exact product type, available thicknesses, sizes, and tolerances?
• Will the quotation identify the applicable standard and clarify any exclusions?
• Can the supplier explain its packing method and provide loading or handling details relevant to your order?
• Are quantity, production schedule, payment terms, and shipping terms stated in writing?
• Can the supplier support the required processing, documentation, inspection, or export coordination?
• Does the supplier respond clearly to technical questions and document agreed changes?

When assessing a supplier, distinguish between manufacturing capability, trading or export support, and downstream processing. Ask who is responsible for each stage and which documents will be provided. Clear answers make it easier to manage specification risk, especially when multiple companies handle production, processing, and shipment.

How Shanglin Glass Can Support Your Inquiry

At Shanglin Glass, we work with B2B buyers sourcing building glass and can review an inquiry based on its stated product and project requirements. To help us assess a request, provide the glass type, thickness, dimensions, quantity, destination, intended application, and any project standard or processing needs. We can then confirm the details that require checking for the specific order and clarify the quotation scope.

Before requesting a quotation, prepare a drawing or schedule if your order includes multiple sizes. Identify whether you need raw float glass or a processed product, and state any packaging or inspection preferences. This gives our team a practical basis for discussing product availability, order conditions, and next steps without assuming requirements that have not been specified.

Conclusion: How to Buy China Float Glass with Confidence

To buy China float glass effectively, define the application first, specify the exact product and dimensions, and verify tolerances, standards, packaging, and commercial terms in writing. Treat thickness and sheet size as part of a complete performance and handling decision, not as standalone purchasing criteria. Where safety, structural, or thermal performance matters, obtain project-specific guidance before ordering.

Your next step is to prepare a consistent inquiry with drawings or a size schedule, quantity, destination, and required product details. Send the same information to shortlisted suppliers and compare their written confirmations as well as their quotations. Shanglin Glass welcomes B2B inquiries and can discuss your building glass requirements based on the specifications you provide.

Contact us to discuss your requirements of China Float Glass(de,ru,fr). Our experienced sales team can help you identify the options that best suit your needs.