Clear float glass is flat, transparent glass made by forming molten glass on a bath of molten tin. Buyers commonly specify it by thickness, sheet dimensions, edge condition, and any further processing, such as tempering or lamination. Common nominal thicknesses include 3 mm, 4 mm, 6 mm, 8 mm, 10 mm, and 12 mm, but available sizes and tolerances depend on the manufacturer and product specification. This guide explains what to confirm before requesting a quotation from Shanglin Glass or another supplier.
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This guide is for importers, glass processors, façade contractors, window and door manufacturers, and project procurement teams sourcing flat glass. It is especially useful when you need to compare quotations that list different thicknesses, sheet sizes, or processing requirements. Clear float glass is a starting material for many products, not automatically a finished safety-glazing product. Your project’s building codes, design requirements, and installation conditions should determine whether additional processing is required.
In the float process, molten glass spreads across molten tin to form a flat ribbon, which is then cooled under controlled conditions. The process produces a generally smooth surface and consistent thickness across the sheet, although the precise properties and permitted tolerances depend on the agreed product standard and supplier specification. “Clear” describes glass made with a relatively low level of visible tint; it does not mean that the glass is completely colorless. A slight greenish edge tint may be more noticeable on thicker pieces.
Clear float glass provides transparency and a flat, workable base for glazing and downstream fabrication. Depending on thickness, design, and applicable requirements, it may be used in windows, doors, partitions, furniture, display cases, and interior glazing. Processors can also use it as a substrate for operations such as cutting, edgework, drilling, coating, tempering, or lamination. The suitability of any finished product depends on its complete construction, not on the float glass alone.
A useful specification identifies more than “clear glass.” Include nominal thickness, sheet or cut size, quantity, edge requirements, intended processing, packaging expectations, and the applicable quality or dimensional standard. If the glass will be incorporated into a regulated building application, identify the required performance and compliance documentation at the enquiry stage. This allows suppliers to assess whether the requested product is raw annealed glass or a processed glazing assembly.
| Specification | What to confirm | Why it matters |
|---|---|---|
| Thickness | Nominal thickness in millimetres and acceptable tolerance | Influences handling, processing, weight, and suitability for the design |
| Dimensions | Stock sheet size or finished cut size; length and width in millimetres | Determines yield, packing, transport, and fabrication planning |
| Glass condition | Annealed float, heat-treated glass, laminated glass, or another finished type | Clarifies safety and performance requirements |
| Processing | Cutting, polished edges, holes, notches, coating, or other operations | Processing can change cost, lead time, and allowable dimensions |
| Packaging and delivery | Crating, loading arrangement, destination, and shipping terms | Helps suppliers quote logistics and reduce handling ambiguity |
Float glass is commonly offered in nominal thicknesses such as 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, and 19 mm. This list describes frequently requested options rather than a promise that every thickness is available from every supplier or in every sheet size. Stock dimensions vary by production line, region, and order requirements, so do not assume a particular “standard sheet size” without confirmation. For a project with fixed openings or fabrication equipment, provide the required dimensions and ask the supplier to confirm availability and tolerances in writing.
For planning, glass mass can be estimated at approximately 2.5 kg per square metre for each millimetre of thickness. On that basis, a 6 mm sheet weighs about 15 kg/m² before packaging, while a 10 mm sheet weighs about 25 kg/m². These are planning estimates; confirm the product data and handling requirements for the actual order. Weight affects manual handling, rack selection, transport, and installation planning.
For furniture, displays, or non-safety interior uses, buyers may begin with clear annealed float glass and then specify suitable thickness and edge finishing. For windows, doors, partitions, overhead glazing, or locations where impact or human contact is a concern, check the applicable building rules and design requirements before choosing the glass. Annealed float glass can break into sharp pieces and should not be treated as interchangeable with safety glazing. Where required, the finished product may need to be tempered, laminated, or designed as a compliant glazing assembly.
Glass thickness alone does not establish suitability for a façade or other structural application. The panel dimensions, support conditions, wind loads, installation details, and relevant local standards all affect the specification. Ask the project’s design professional to define performance requirements, then provide those requirements to the supplier or processor. This avoids relying on a generic thickness recommendation for a specific building condition.
Define the end use. State whether the glass is for a window, partition, furniture component, display, or another application. Identify whether safety glazing, thermal performance, acoustic performance, or a particular appearance is required.
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Confirm the product type. Decide whether you need raw annealed clear float glass or a further-processed product. If the final item must be tempered or laminated, clarify who will perform that processing and what documentation is required.
Set dimensions and tolerances. Give sheet dimensions or finished cut sizes, and ask the supplier to confirm permissible dimensional and thickness tolerances. Include drawings for shaped pieces, holes, notches, or other fabrication details.
Specify finishing and packing. Describe edgework, surface protection, separators, crate requirements, and loading preferences. Packaging should be appropriate to the route, handling method, and destination, which the buyer and supplier can review together.
Compare complete quotations. Check that each offer covers the same glass type, thickness, dimensions, processing, quantity, packaging, delivery terms, and documentation. A lower unit price may not represent a lower landed cost if the scope or freight basis differs.
Clear float glass pricing depends on factors such as thickness, dimensions, order quantity, processing, packing, and delivery destination. Minimum order quantities and lead times are supplier- and order-specific, and may differ between stock sheets and custom-cut or processed products. Rather than relying on a general online estimate, request a quotation with the quantity, delivery location, required date, and full specification. Ask the supplier to separate product, processing, packing, and freight assumptions where applicable.
To make quotations easier to compare, send one consistent enquiry schedule to all suppliers. Include the glass type, thickness, size, quantity by size, processing details, packing instructions, destination, and required delivery window. Also ask how the supplier handles specification changes, breakage claims, and inspection records. Confirm the final approved specification before production or shipment.
At Shanglin Glass, we can review your clear float glass requirements and help clarify the information needed for a product and logistics quotation. Share drawings or a size schedule when available, along with the intended application and any processing or compliance requirements. We can then discuss the specification, packaging, order quantity, and delivery details for your enquiry. Final availability, pricing, and timing should be confirmed against the approved order specification.
Clear float glass is a flat, transparent base material available in a range of thicknesses and sheet dimensions, but its exact options and tolerances must be confirmed with the supplier. Choose the product by starting with the end use, then specify thickness, size, processing, packing, and applicable project requirements. Do not assume annealed float glass meets safety-glazing needs or that a nominal thickness alone proves suitability for a building application. Prepare a complete enquiry schedule and request a quotation based on the same scope from each supplier.
To discuss a clear float glass order with Shanglin Glass, send your target thickness, dimensions, quantity, destination, application, and any required processing or documentation. If you have not finalized the specification, include your drawings and project requirements so the options can be reviewed before you place an order.
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