IS 2835:2009 is the Indian Standard (BIS) for flat transparent sheet glass. This standard prescribes the requirements and methods of sampling and testing for flat transparent sheet glass used primarily for glazing in doors, windows, and partitions. It covers nominal thicknesses, dimensional tolerances, and limits for optical distortion and visual defects.
Specifies requirements for flat transparent sheet glass for general purpose glazing.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Thickness Tolerance (for 3 mm nominal thickness) | ±0.2 mm | ±0.2 mm | EN 572-4:2012 |
| Visible Light Transmittance (min, 3 mm glass) | 87% | ~90% (Typical value, not a minimum requirement) | EN 572-1:2012 |
| Permissible Gaseous Inclusions (Bubble Size, 3mm glass) | Max 0.5 mm for 'AA' Quality | Max 1.0 mm for standard 'Glazing Quality' | EN 572-4:2012 |
| Squareness Tolerance (for a 1m x 1.5m sheet) | Difference in diagonals shall not exceed 2 mm per metre of the shorter side (i.e., 2 mm max). | Difference in diagonals shall not exceed 3 mm (for dimensions up to 2000 mm). | EN 572-4:2012 |
| Quality Nomenclature (Highest Grade) | Quality AA (Special Quality) | Quality Q1 (Highest optical/visual quality) | ASTM C1036-21 |
| Available Nominal Thickness Range | 2 mm to 6.5 mm | 2 mm to 10 mm | EN 572-4:2012 |