Custom Float Glass Buying Guide: Specifications, Sizes, and RFQ Requirements

To buy custom float glass efficiently, define the glass type, thickness, finished dimensions, edge condition, quantity, and any required processing before requesting a quote. Also state the intended application, delivery destination, packaging needs, and target schedule. These details help a supplier assess whether the requested product can be made and shipped as specified, and reduce avoidable clarification during quotation.

For more information, please visit our website.

Custom float glass is flat glass made to specified dimensions and, where required, supplied with additional processing such as cutting, polishing, or coating. The right specification depends on how the glass will be used: a panel for a cabinet door may have different requirements from glass intended for a building façade. This guide explains what to define, how to compare offers, and what to include in an RFQ to Shanglin Glass or another supplier.

Who This Guide Is For

This guide is for purchasing teams, fabricators, contractors, distributors, and product manufacturers sourcing glass for building or related applications. It is especially useful when the buyer has a drawing or project requirement but needs to turn it into a clear, comparable request for quotation. If you are still selecting the glass makeup, use the application and selection sections below to identify the questions to resolve before placing an order.

Understand the Product and Its Options

What Custom Float Glass Means

Float glass is produced as a continuous flat sheet and can be supplied as a base material or further processed to meet a project specification. “Custom” may refer to the sheet size, thickness, color, edgework, surface treatment, or a combination of these. Not every supplier offers every process, so identify which features are essential and ask the supplier to confirm availability.

Material and Processing Choices

Depending on the application and supplier capabilities, buyers may request clear or tinted glass, and may ask about options such as low-iron glass, patterned glass, reflective or other coated products. Further processing may include cutting to size, edge grinding or polishing, holes, notches, and tempering or lamination through a suitable processing route. These options are not interchangeable: for example, holes and edge details generally need to be specified before the relevant heat-treatment stage.

Describe the required product in terms the supplier can verify. If a project specification names a standard, coating, color, or safety-glazing requirement, include the exact designation and ask the supplier to confirm that the offered product matches it. Do not rely on a generic description such as “safety glass” or “energy-saving glass” without defining the required construction or performance criteria.

Match Specifications to the Application

Start with the function of the glass, not just the dimensions. A building application may require consideration of wind load, impact risk, thermal stress, human safety, energy performance, or local code requirements. These factors should be reviewed by the project’s responsible designer or engineer; a glass supplier can provide product information but should not be treated as a substitute for project-specific design approval.

For interior partitions, furniture, display cases, doors, and façade components, the required glass makeup can differ considerably. Confirm whether the panel is monolithic, laminated, or part of an insulating glass unit, and whether it must be heat-treated. If the glass will be incorporated into a larger assembly, provide the assembly context so the supplier can quote the appropriate product rather than an incomplete base sheet.

Define Size, Thickness, and Quantity

State dimensions in a single unit system and identify width and height consistently, as viewed from a specified side if orientation matters. Common nominal float-glass thickness examples include 3 mm, 6 mm, and 10 mm, but the appropriate thickness and available range depend on the application, product, and supplier. Ask the supplier to confirm the offered thickness, dimensional tolerances, and whether the quoted size is the cut size or the overall finished size.

For an initial weight estimate, soda-lime glass is often approximated at about 2.5 kg per square metre per millimetre of thickness; actual weight can vary with composition and specification. On that basis, a 6 mm panel is approximately 15 kg/m² before packaging. Use the supplier’s confirmed product data for handling, shipping, and structural calculations rather than treating this estimate as a certified value.

Do not assume a requested maximum sheet size is available. State the exact panel dimensions and total quantity, then ask for the supplier’s production limits, cutting allowance, and any size-related restrictions for the chosen processing. For irregular shapes, include a dimensioned drawing in a commonly readable format and mark critical dimensions, radii, holes, notches, and orientation.

If you want to learn more, please visit our website Shanglin Glass.

Use a Practical Selection Framework

1. Confirm the application. Identify where the glass will be installed, how it will be supported, and whether it is exposed to weather, impact, heat, or public contact.
2. Set the required glass makeup. Specify the base material and whether the design calls for monolithic, laminated, coated, or insulating glass. Identify any required safety or performance criteria.
3. Document dimensions and finish. Provide thickness, finished size, edge treatment, surface orientation, and all cut-outs or other processing details.
4. Check compatibility and feasibility. Ask the supplier to review whether the requested dimensions, processing sequence, and packaging can be accommodated together.
5. Compare complete offers. Review product description, tolerances, exclusions, packing, delivery terms, and lead-time assumptions—not only the unit price.

When the design is not final, separate confirmed requirements from open questions in the RFQ. For example, state the required panel dimensions while asking the supplier to advise which available thicknesses or processing options may suit the application. This makes the quotation more useful without implying that the supplier has approved the engineering design.

Pricing, MOQ, and Lead Time

Custom-glass pricing is influenced by factors such as glass type, thickness, dimensions, quantity, processing, packaging, and shipping destination. A smaller quantity or unusual shape may require a different production arrangement from a repeat order, but the effect depends on the supplier’s process and current capacity. Request a quotation against the exact specification, and ask the supplier to identify any tooling, setup, or packaging charges separately.

Minimum order quantity and lead time should be confirmed for the specific product and destination rather than assumed from a general product page. Ask when the quoted lead time begins—for example, after drawing approval, deposit, or confirmation of final specifications—and whether it refers to production only or includes transit. If a project has a required delivery date, state it in the RFQ and request a written feasibility confirmation.

Supplier Evaluation Checklist

A useful supplier review checks both product capability and communication. Ask whether the supplier can provide the requested type, dimensions, and processing, and how it confirms drawings and specifications before production. For building-glass orders, request the applicable product documentation and confirm that it corresponds to the exact product being quoted; do not assume that a general company certificate covers every item or application.

• Can the supplier confirm the requested glass type, thickness, size, and processing?
• Are tolerances, edge quality, appearance requirements, and inspection criteria stated?
• Are packaging, loading method, shipping terms, and destination clearly defined?
• Does the quotation distinguish confirmed details from assumptions or exclusions?
• Can the supplier provide relevant technical information for review by the project team?

As a building-glass supplier, Shanglin Glass can review an RFQ for specification completeness and discuss available product and supply options. Provide drawings and project requirements early so our team can identify questions before quotation. Final product suitability should be checked against the project design, applicable regulations, and the requirements of the responsible professional.

RFQ Requirements: What to Send

A strong RFQ gives suppliers enough information to quote the same scope. Include the following items where applicable, and mark any undecided detail clearly rather than leaving it ambiguous.

• Application and project: intended use, installation location, and relevant project or drawing reference.
• Product description: glass type, color or coating, construction, and any specified standard or performance requirement.
• Dimensions: thickness, width, height, quantity by size, unit system, and a dimensioned drawing for shaped panels.
• Processing: edge finish, holes, notches, cut-outs, corners, heat treatment, lamination, or other required operations.
• Quality and appearance: applicable tolerances, inspection criteria, visible-face requirements, and acceptable marking or labeling.
• Order and delivery: total quantity, packing needs, delivery address or port, requested delivery date, and preferred shipping terms.
• Commercial details: requested quotation validity, payment expectations, and whether samples or a pre-production approval are needed.

Common RFQ Mistakes to Avoid

One frequent problem is requesting “custom glass” without stating the intended product construction or processing. Another is sending dimensions without indicating whether they are finished sizes, or omitting hole locations and edge details from the drawing. Buyers can also create delays by asking for a delivery commitment before the final specification, quantity, and destination are known.

Before issuing a purchase order, compare the supplier’s quotation with the approved drawing and confirm every deviation in writing. Resolve discrepancies in thickness, dimensions, edgework, coating, quantity, packaging, and delivery terms before production begins. If revisions are made after approval, ask the supplier to confirm any effect on price and schedule.

Key Takeaways and Next Steps

Custom float glass is best sourced through a complete, application-led specification—not dimensions alone. Define the product makeup, thickness, finished size, processing, quantity, quality requirements, and delivery details, then ask suppliers to confirm feasibility, tolerances, MOQ, and lead time for that exact scope. This approach gives your team a clearer basis for comparing quotations and reduces the risk of mismatched expectations.

To request a quotation from Shanglin Glass, prepare your size schedule or drawing, state the application and destination, and list any open technical questions. Our team can review the information and discuss suitable available supply options. Where design or regulatory approval is required, have the responsible project professional confirm the final glass specification before ordering.