Building materials · Reference
Standard float glass comes in nominal thicknesses of 2, 3, 4, 5, 6, 8, 10, 12, 15 and 19 mm (about 1/16–3/4 in) per EN 572-2 and ASTM C1036; it weighs about 2.5 kg/m² per mm.
Float glass is specified by length × width, with thickness (in mm) called out separately.
| Nominal thickness | Inch (approx.) | Weight | Typical use |
|---|---|---|---|
| 2 mm | ~1/16 in | 5.0 kg/m² (1.0 lb/ft²) | Picture frames, small panes |
| 3 mm | ~1/8 in | 7.5 kg/m² (1.5 lb/ft²) | Cabinets, small windows |
| 4 mm | ~5/32 in | 10.0 kg/m² (2.0 lb/ft²) | Windows, IGU panes |
| 5 mm | ~3/16 in | 12.5 kg/m² (2.6 lb/ft²) | Windows, shelves |
| 6 mm | ~1/4 in | 15.0 kg/m² (3.1 lb/ft²) | Doors, tabletops, facades |
| 8 mm | ~5/16 in | 20.0 kg/m² (4.1 lb/ft²) | Shopfronts, furniture |
| 10 mm | ~3/8 in | 25.0 kg/m² (5.1 lb/ft²) | Balustrades, large panes |
| 12 mm | ~1/2 in | 30.0 kg/m² (6.1 lb/ft²) | Frameless doors, facades |
| 15 mm | ~5/8 in | 37.5 kg/m² (7.7 lb/ft²) | Structural glazing |
| 19 mm | ~3/4 in | 47.5 kg/m² (9.7 lb/ft²) | Glass floors, fins |
| Nominal thickness | Thickness tolerance |
|---|---|
| 4 mm | ±0.2 mm |
| 6 mm | ±0.2 mm |
| 8 mm | ±0.3 mm |
| 10 mm | ±0.3 mm |
| 12 mm | ±0.3 mm |
| 15 mm | ±0.5 mm |
Source: Pilkington (NSG Group) — float glass manufactured to BS EN 572-2
| Sheet format | Size (mm) | Approx. imperial |
|---|---|---|
| Jumbo (PLF) | 3210 × 6000 mm | 126 × 236 in |
| Machine size | 3210 × 2250 mm | 126 × 89 in |
| Machine size | 3210 × 2500 mm | 126 × 98 in |
| Split size | 3210 × 2000 mm | 126 × 79 in |
Source: Saltcam — Clear Float Glass technical specifications
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Standard float glass is 2, 3, 4, 5, 6, 8, 10, 12, 15 and 19 mm thick (about 1/16 to 3/4 in) per EN 572-2 and ASTM C1036.
About 2.5 kg/m² per mm of thickness. So 4 mm ≈ 10 kg/m², 6 mm ≈ 15 kg/m² (3.1 lb/ft²) and 10 mm ≈ 25 kg/m².
Most residential windows use 3–6 mm float glass; larger panes, doors and tabletops step up to 6–12 mm, and balustrades or structural glass use 10–19 mm.
Float glass is produced on a ~3210 mm-wide ribbon and cut into split, machine (e.g. 3210 × 2250 mm) and jumbo (3210 × 6000 mm) sheets.
1/4 in glass is nominally 6 mm — one of the most common thicknesses for doors, tabletops and shopfronts.
Every figure on this page is traced to a named source, linked under each table. Standard sizes come from published standards and established industry references; where a size is a typical range or varies by manufacturer, we say so. Sizes vary by region, model and revision — treat these as the standard reference, and confirm the exact spec of the item you are selling.
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