Searches for 6mm, 8mm, 10mm and 12mm toughened glass are common because thickness is easy to compare. But choosing thickness from a simple chart can be unsafe. A small framed panel and a large frameless panel may need very different solutions even when they are used in the same room.
Use this page as a vocabulary and planning guide. Final selection should account for panel dimensions, support, holes, loads, height above ground, human impact, wind, hardware and any applicable design or safety requirements.
Quick answer
- Common nominal thicknesses include 4, 5, 6, 8, 10, 12, 15 and 19 mm, but availability varies.
- More thickness generally means more stiffness and weight; it does not automatically make every design safe.
- Large unsupported spans, heavy doors, railings and structural applications need system-level design.
- Hardware must be compatible with the selected thickness and panel weight.
- Never substitute a thickness from an internet table for an engineer or system specification where one is required.
What changes when glass gets thicker?
A thicker pane is generally stiffer and heavier. The increase in stiffness can reduce visible deflection in the same geometry, but the benefit depends on panel shape, support and load. Weight also rises directly with thickness, which affects hinges, channels, anchors, transport and handling.
Thicker is therefore not simply 'better'. It can add cost and hardware demands without solving a poor support detail or an unsuitable glass type.
Common thicknesses in simple terms
| Nominal thickness | Typical conversation around it | What to confirm |
|---|---|---|
| 4–5 mm | Smaller or more lightly loaded glazing and manufactured components | Application, size, support and whether safety glass is required |
| 6 mm | Windows, furniture and some framed/interior uses | Panel size, exposure and edge support |
| 8 mm | Partitions, doors, furniture and many custom applications | Hardware, width/height and exposed edges |
| 10 mm | Frameless doors, partitions, showers and heavier custom work | Weight, fittings, panel geometry and safety requirements |
| 12 mm | Large doors, partitions, table tops and some railing/system applications | Engineering/system specification, fittings and span |
| 15–19 mm | Special heavy-duty, structural or furniture applications | Professional design, handling and compatible systems |
These are examples of where the thicknesses are discussed in the market, not universal design recommendations.
Thickness for glass doors
Door panels move, carry hardware loads and are handled repeatedly. The correct thickness depends on height, width, hinge or patch-fitting system, number and location of holes, door weight and manufacturer limits. Frameless doors especially should follow the hardware/system specification.
See the glass door guide for a full buying checklist.
Thickness for partitions and showers
Interior partitions can be framed, semi-frameless or frameless. A channel-supported fixed partition behaves differently from a swinging door. Shower panels add wet-area hardware, seals and frequent human contact.
Continue with the glass partition guide and bathroom glass guide.
Thickness for railings, balconies and stairs
Guarding applications are safety-critical because failure can involve a fall. The glass build-up, support method, handrail or top rail, post-breakage behaviour and local project requirements matter as much as nominal thickness. Toughened laminated constructions may be considered in systems where retention after breakage is important.
Do not use a generic '12mm is enough' rule for a railing. Use the specified tested or engineered system.
Thickness for table tops and shelves
Furniture glass is influenced by span, support points, edge exposure, holes, expected loads and whether the pane sits on a full base or bridges between supports. A polished edge may be important where the edge is visible or touched.
See Table top and shelf glass guide for measurement and edge-finish details.
Weight matters too
A useful rule for planning is that glass gets heavy quickly as thickness and area increase. Installers may need suction lifters, multiple people or lifting equipment. Hardware must be rated for the actual panel mass and dimensions, not just a nominal thickness label.
A safer way to choose
- Describe the exact application before discussing thickness.
- Measure width and height accurately.
- Identify all supported and unsupported edges.
- Provide hardware and hole details.
- Explain whether the panel is indoors, outdoors, overhead or part of a barrier.
- Ask whether laminated, insulating or coated construction is required in addition to toughening.
- Follow project drawings, approved systems and professional advice for safety-critical work.
Find local glass businesses
When you are ready to compare local options, use GlassDirect to browse available businesses by service and location. A listing can help you discover businesses, but always confirm the exact glass type, specification, availability, measurement and installation requirements directly with the business.
Search GlassDirect: find available glass dealers by city, pincode, service or business name.
Common questions
Is 12mm toughened glass stronger than 8mm?
For the same glass type and geometry, thickness changes stiffness and load behaviour, but a complete design also depends on dimensions, supports, holes, edges and loads.
What thickness is best for a glass door?
There is no single best thickness for every door. Use the door dimensions and the limits of the selected hinge or patch-fitting system.
Can I use the same thickness for a partition and railing?
You should not assume that. A railing is a fall-protection system and can have very different post-breakage and loading requirements.
Why do suppliers ask for dimensions before quoting?
Panel size changes glass area, weight, stiffness, processing and hardware requirements, so thickness cannot be considered in isolation.