Toughened Glass Thickness: 8 mm, 10 mm or 12 mm?

Weight is the decision

Glass weighs roughly 2.5 kg per square metre per millimetre of thickness. That single figure drives almost every downstream choice.

Take a typical shower door at 700 mm by 1900 mm, which is 1.33 square metres.

In 8 mm that door weighs about 27 kg. In 10 mm, about 33 kg. In 12 mm, about 40 kg.

Those 13 kilograms between the lightest and heaviest option hang off two hinges continuously, for years. That is why hardware ratings exist, and why a door that was fine on the day can sag two years later.

What each thickness is for

Eight millimetres is the standard residential shower choice across most of India. It is light enough to be forgiving on hardware, strong enough for a domestic door, and the cheapest of the three.

Ten millimetres is the middle option. It feels noticeably more solid in the hand, flexes less, and suits a wider door or a household that will use it hard.

Twelve millimetres is for large panels, commercial and hospitality installations, and frameless partitions where the glass is doing structural work. It is also what you specify when the panel is wide enough that thinner glass would visibly flex.

For fixed panels that never move, thinner glass is often adequate, because the hardware is holding a static load rather than carrying a swinging one.

What it means for hardware

A hinge rated for an 8 mm door will grip 12 mm glass — the clamp will close on it — and it will hold at first. What it will not do is carry the extra weight indefinitely. The door drops a few millimetres, stops meeting its seal, and the enclosure starts leaking at the bottom corner.

That failure looks like a seal problem and is actually a hinge specification problem.

Tell us the thickness when you order and we will confirm the item from stock against the actual product rather than from a catalogue line.

[CONFIRM] We are adding per-hinge glass thickness ratings to the product pages for SA-75 to SA-78. Until those are verified against the items on the shelf we would rather say nothing than publish a figure we cannot stand behind.

Buy the hardware before the glass

This is the part that costs money when it is missed.

Toughened glass cannot be drilled, cut or modified after tempering. Any attempt shatters the panel. Every hole, notch and cut-out must be specified before the glass goes into the furnace.

Those cut-out positions and sizes come from the hardware. So the order is: choose the fittings, take the cut-out dimensions from them, give those to the glass supplier.

Do it the other way round and you have two options, both expensive: new glass, or finding hardware that happens to match holes already made. New glass is usually the cheaper of the two.

Measure the opening properly

Measure the width at the top, the middle and the bottom, and use the smallest. Openings are rarely square, and a panel cut to the widest measurement will not go in.

Check the floor is level across the opening and the walls are plumb. On a frameless enclosure there is no frame to absorb a discrepancy — any error in the opening shows up as a gap you cannot close.

If any of that is in doubt, send photographs of the corners with your measurements on WhatsApp before ordering the glass. It is the cheapest check in the whole job.