Custom-cut float glass: The practical guide to cutting

You have the dimensions, you know it should be clear glass, and yet questions remain: Which thickness can withstand your project? Is a cut edge sufficient or do you need more? And what happens if you make a mistake while measuring? Float glass made-to-measure sounds like a simple order, but in practice, it is precisely these details that determine whether the pane will actually fit in the end.

Most providers show you a configurator and leave you alone with the detailed questions. This guide does the opposite: It shows what can actually be ordered from Adamer, where the pitfalls lie, and how you can get the right pane in just a few steps without an expensive bad buy.

Ordering custom-cut float glass: A quick orientation

Custom-cut float glass is clear glass cut to the millimeter without safety tempering, ideal for shelf boards, lantern glass, small furniture inserts, and light decorative applications. At Adamer, you can order it online in thicknesses of 2, 3, and 4 mm with a cut edge, custom-made to your desired dimensions in millimeters.

Anyone who has ever searched for "custom glass" knows the range of configurators that promise much and explain little. Before you order, it is worth taking a look at the actual options, because not every edge treatment or color variant is really immediately available from every provider—more on that in a moment.

Custom glass pane, custom glass plate, custom float glass: One and the same?

Yes, essentially. Custom glass pane, custom glass plate, and custom float glass generally refer to the same product: a pane of clear base glass cut to the millimeter. The difference usually lies only in the wording, not in the material.

Anyone searching online will come across many terms for one and the same thing. A custom glass plate for a desk, a custom glass pane for a shelf, or a custom glass cut for a lantern—in most cases, this means float glass: the standard glass produced using the float process, which forms the basis of almost all flat glass products. Our basic article What is float glass? The practical guide for your project explains exactly what is behind the manufacturing process and why float glass is so versatile. This article starts exactly where the definition ends: with the actual order.

When is custom-cut float glass enough, and when is it not?

Custom-cut float glass is suitable for applications without increased safety requirements, such as shelf boards, lantern glass, or small furniture inserts. As soon as people could be endangered by breakage—for example, with showers, tabletops, railings, or overhead glazing—safety glass (tempered or laminated) is mandatory or strongly recommended.

In an emergency, the difference is not a trivial matter: float glass is not tempered and breaks into long, sharp-edged splinters upon impact. The following table shows the rough classification:

Picture frames and display cabinets are a special case: the focus here is usually not on break resistance, but on distracting reflections. For this purpose, we recommend anti-reflective glass instead of standard float glass, which significantly reduces reflections and makes the view of the exhibited items clearer.

If you are unsure about your project, it is worth taking a look at our guide Custom safety glass: Tempered or laminated?, which explains the decision between the two types of safety glass step by step. By the way, separate rules apply when ordering custom safety glass, especially because tempered glass cannot be reworked after the tempering process.

Measuring glass correctly: How to avoid the most common ordering mistake

Measure in millimeters, note down width × height, and check the result a second time before ordering. Incorrect measurements are the most common reason why a custom-made glass pane does not fit in the end.

This is not a niche problem. In 2025, returns in German online retail reached a new high of 57 percent, and incorrect size was by far the most frequent reason for returns, at 71 percent. With a custom-made product like custom glass, however, a return is not an option; a wrongly ordered pane usually cannot be used.

Here is how to measure safely:

• Always measure and specify in millimeters, never in centimeters
• Note format as width × height, for example 600 × 400 mm
• When installing in a frame or rebate, measure the clear opening, not the frame itself
• Plan for a small tolerance: 2 to 3 mm of space per side is common for frame inserts
• Measure twice, order once
• For irregular shapes or tight spaces, seek advice beforehand

The team at Adamer checks your measurements before production, free of charge and without obligation, providing an additional safety net against this very common error.

Edge treatment for custom float glass: What is actually possible

At Adamer, custom float glass is currently produced with a cut edge—a clean, but not ground or polished edge. If you need a polished edge for areas that are freely visible or touched by hand, you should clarify this with our team before ordering.

Many providers advertise "always polished edges" without explaining what the pane is actually intended for. It is more honest to take a look at the actual edge shapes and their respective intended uses, as also described in DIN 1249-11 for glass edges:

For shelves, free-standing edges, or pieces of furniture without a frame, a treated edge is almost always the better choice, if only for injury protection. The fastest way to clarify whether and when a ground or polished edge is available for your project at Adamer is to contact our team directly before completing the order.

Choosing float glass thickness: The right strength for your project

For most interior applications without safety requirements, 2 to 4 mm of float glass is sufficient. The larger the open area or the heavier the load, the thicker the pane should be.

At Adamer, custom float glass is currently configurable in thicknesses of 2, 3, and 4 mm. In practice, this means:

Rule of thumb: The larger the unsupported span of a pane, the thicker it should be. A 4 mm shelf with a width of 80 cm carries light decorations without problems; for books or heavier objects, you need either a thicker version or additional support points. If you would like to realize a project outside of this scope, for example with a greater thickness, please contact us directly, and we will check together with you which solution is suitable.

Float glass or extra-white glass to measure: Classifying the color option correctly

Due to its natural iron oxide content, float glass has a green tint, which is hardly noticeable when looking through it but becomes clearly visible at the glass edge, especially with thicker panes. Extra-white glass (low-iron float glass) is almost color-neutral even at the edge and is particularly suitable where color accuracy counts.

For most applications—shelves, lantern glass, simple furniture glazing—the view through standard float glass is clear and practically colorless, which is hardly noticeable when looking through the pane. The real problem shows at the edge: the greenish color tint is clearly visible there, regardless of how clear the surface itself appears. This green tint is especially eye-catching with freely visible edges, such as frameless shelves, table edges, or stacked panes. For color-critical projects such as backlit surfaces, lacquered back panels, or large-format panes with many layers, it is therefore worth opting for extra-white float glass. A note in advance: for some special thicknesses of the extra-white variant, the order is currently processed via a personal request instead of the instant configurator; a quick message via the contact form usually clarifies what is possible for your format within a short time.

Quickly estimate the glass weight for custom float glass

One square meter of glass weighs 2.5 kilograms per millimeter of thickness. A 4 mm shelf measuring 80 × 30 cm therefore weighs about 2.4 kg; a larger pane weighs significantly more.

Especially with larger formats, the weight adds up faster than one might think, which is relevant for transport, installation, and the load-bearing capacity of brackets. You can find the complete formula, a weight table by thickness, and practical examples for mirrors, tabletops, and shelves in our guide Calculating glass weight: Formula, table, and practical examples.

How ordering from Adamer works

In short: enter dimensions, choose thickness and edge treatment, check the preview, and order. Production is then carried out to the millimeter, and delivery usually takes 5 to 7 working days.

• Enter dimensions in millimeters in the configurator at float glass
• Choose thickness (2, 3, or 4 mm)
• Determine edge treatment
• Check preview and price calculation in the configurator
• Complete the order; for mixed orders with other items, the longest delivery time of all items in the shopping cart applies
• You will receive your pane reliably and carefully packaged

If you are unsure about dimensions, edge treatment, or custom requests, you can reach our team directly via our Contact page or live chat, without any call center detours.

The most common mistakes when ordering custom float glass

• Specified centimeters instead of millimeters: Glass manufacturers work exclusively in millimeters. A deviation of even a few millimeters can mean the pane will not fit.
• Forgot edge treatment: An untreated cut edge is unsuitable for freely accessible, hand-touched areas and cannot be changed subsequently.
• Chosen wrong thickness for the span: Glass that is too thin will sag under load or break. When in doubt, choose a greater thickness or seek advice.
• Overlooked green tint at the edge: The view through standard float glass appears clear, but the green tint is clearly visible at the edge. Anyone planning a freely visible edge, such as a frameless shelf, should specifically choose extra-white glass instead of standard float glass.
• Ignored safety requirements: Float glass is not safety glass. For tabletops, showers, or railings, tempered or laminated glass is required—no exceptions.

Custom float glass from Adamer: Why the specialist company is worth it

Adamer is a family-run glass specialist business with roots dating back to 1857, originally operating as a classic glazing and trading company in Bavaria. Since 2011, Adamer Sicherheitsglas GmbH has also been producing tempered and laminated glass in-house at its Kösching site, allowing you to seamlessly switch from float glass to safety glass for more complex projects—all from a single source and with personal advice.

Current market figures also show that made-to-measure glass remains in demand: The renovation market for windows was revised upwards for 2025, from an original 1.2 percent to 3.5 percent growth, while new construction remains in decline. In the window component sector, the energetic renovation rate in 2025 was also significantly higher at 1.19 percent than for roofs or facades—an indication of how much renovation and replacement demand there continues to be for custom glass. In total, around 1.8 million tons of flat glass were recently produced in Germany, the basis for windows, furniture, mirrors, and also for individually cut float glass. The core German DIY market also remains a significant sales channel for cut products like custom glass with a sales volume of around 49.7 billion euros recently, despite an overall more difficult market environment.

Order custom float glass now!

Whether for shelves, lantern glass, or furniture glazing: with the right measurements, the appropriate thickness, and the suitable edge treatment, custom-cut float glass becomes a piece that fits perfectly the first time. If you are unsure, the experts at Adamer are personally at your side, from measuring checks to choosing the right type of glass.

Configure custom float glass now →

Frequently asked questions about custom float glass

What dimensions are possible for custom float glass?

At Adamer, custom float glass is produced to the millimeter according to your desired dimensions. Enter the width and height in millimeters in the configurator; it is best to clarify individual formats outside the standard range directly with our team.

What thickness do I need for custom float glass?

That depends on the intended use. For picture frames, lantern glass, and small protected surfaces, 2 mm is often sufficient; for thin shelves and larger picture frames, 3 mm; for shelves and furniture glass, 4 mm is the standard choice. For larger spans or higher loads, professional advice is recommended.

Can I get custom float glass with a polished edge?

By default, custom float glass is produced by Adamer with a cut edge. For freely visible or hand-touched areas where a ground or polished edge makes sense, please speak to our team directly before placing your order.

How long does the delivery of custom float glass take?

The estimated delivery time is usually 5 to 7 working days. For mixed orders with other items, the longest delivery time of all items in the shopping cart applies.

Is custom float glass suitable for showers or tabletops?

No. Float glass is not safety glass and breaks into sharp-edged splinters. For shower enclosures, tabletops, railings, or overhead glazing, you need tempered or laminated glass. Read more about this in our guide Custom safety glass: Tempered or laminated?