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Laminated glass for windows: how it works and where to use it

What laminated glass is, how its thickness is written, how it compares with toughened glass and the Indian safety glass rule. For homeowners and architects deciding which panes need it.
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THE SHORT ANSWER

Laminated glass holds together when it breaks

Laminated glass for windows is two or more panes bonded by a plastic interlayer, usually PVB. If the glass breaks, the fragments stay stuck to the interlayer instead of falling out of the frame. It suits spots where falling glass could hurt someone or break-ins are a worry, and it helps with road noise. It costs more than ordinary glass.
Our verdict: it earns its place on ground-floor and street-facing windows, low panes, overhead glazing and rooms facing a busy road. Most other openings do not need it. Where none of those reasons applies, ordinary glass, or toughened glass where size or position calls for safety glass, is usually enough. Our overview of window glass options compares the other types.

How laminated glass is made and what the interlayer does

The plies can be annealed (ordinary float) or toughened glass. They are laid up with an interlayer of PVB, TPU or cross-linked EVA, rolled or vacuum bagged to remove trapped air, heated for an initial melt, then heated again under pressure in an autoclave.
In India the interlayer is almost always PVB, the same material used in car windscreens, according to an Indian design-education guide. The same guide describes SGP, an ionoplast interlayer, as stiffer and stronger, and says it is used for balcony railings, glass floors and overhead glazing. For staircase and balcony edges it recommends toughened-laminated glass; our glass railings page covers the railing systems we offer.

How laminated glass thickness is written

The figure is the glass plies plus the interlayer: 0.38 mm is one PVB film and 0.76 mm is two. If a quote gives only a total such as 6.38, ask which plies make it up and whether they are toughened.
6.38 mm is not a universal window thickness. AIS sells it for basic protection of homes and shop windows against vandalism and smash-and-grab attempts, and suggests thicker builds for higher-risk areas. The right build for a large pane comes from a size and wind check, which our guide to glass thickness walks through.
Written asGlass pliesInterlayerWhere the example comes from
5.38 mm2.5 mm + 2.5 mm0.38 mmTextbook example (Wikipedia)
6.38 mm3 mm + 3 mm0.38 mm PVBIndian guide; sold by AIS for basic protection
5+5+0.765 mm + 5 mm0.76 mm PVB (two films)Totals 10.76 mm
8.38 mm and upNot statedNot statedNamed by an Indian guide as the next step

Sources: Wikipedia (Laminated glass), Studio Matrx laminated glass guide, AIS laminated glass page. Other shorthand codes are in use; we show only the ones we could check, so ask for every build-up in millimetres.

COMPARISON

Laminated vs toughened glass: strength, breakage and security

Toughened glass is about four times stronger than annealed glass and breaks into small, rounded granules that fall out of the frame. Laminated glass cracks in a spider-web pattern, radial and concentric, and largely stays in place. Toughened-laminated glass is made from toughened plies, so it combines the higher strength with the stays-together behaviour.
Toughened glass cannot be cut, drilled or reworked once tempered, so sizes must be final before the order. Laminated glass can be cut after it is made. Nickel sulphide inclusions can also cause rare spontaneous breakage of toughened glass, sometimes years after installation.
GlassRelative strengthWhen it breaksSecurity (one guide's rating)
Float (annealed)BaselineSharp shards fallPoor
ToughenedAbout four times annealedSmall blunt granules fall outPoor
LaminatedDepends on its pliesCracks, holds togetherGood to high
Toughened-laminatedToughened pliesHolds togetherNot rated separately

Sources: Wikipedia (Toughened glass, Laminated glass) and the Studio Matrx laminated glass guide for the breakage and security columns. The security column is one guide's view, not a tested class.

The safety glass rule: IS 2553 (Part 1):2018 and the 2020 order

The Safety Glass (Quality Control) Order, 2020 was issued by the Ministry of Commerce and Industry as S.O. 1045(E), dated 12 March 2020, and came into force on 16 September 2020. It covers safety glass for architectural, building and general uses. Such glass must conform to IS 2553 (Part 1):2018 and bear the Standard Mark under a BIS licence. Goods meant for export are exempt. BIS is the certifying and enforcing authority, and amendments to the standard notified by BIS from time to time apply.
IS 2553 (Part 1):2018 is the fourth revision and replaced the 1990 edition. Its scope is safety glass for architectural, building and railway uses, in four types: toughened safety, toughened-float safety, laminated safety and laminated float safety. It calls for flat transparent glass of AA or A quality.
Two limits apply. The order sets what safety glass must be, not which openings in a house need it; we have not found the clause that does, so follow your architect’s specification. Do not assume the mark is there either. Ask to see it on the pane.

Where laminated glass makes sense in a home

An Indian design-education guide suggests the places below; treat them as a starting point with your architect, not a rule. The same source names toughened glass for large panes, glass doors and floor-to-ceiling glazing, and wants overhead or sloped glass laminated-toughened.
  • Ground-floor and street-facing windows, where security is the concern
  • Balcony and staircase railings, in toughened-laminated glass
  • Overhead and low-level glass: skylights, canopies and full-height panels
  • Rooms with valuable furnishings, because the interlayer can block nearly all UV
  • Homes near roads, railway lines or airports, in an acoustic laminated build

NOISE

Laminated glass and noise

A laminated pane significantly improves sound attenuation compared with a single pane of the same thickness. The best results need a PVB made with a special acoustic compound, and for heavy noise, panes of different thicknesses work better than matched ones. AluK’s own advice for noisy sites is laminated acoustic glass combined with double glazing.
Maker figures need care. AIS claims its Acousticglas reduces noise by up to 40 dB, but gives no test method, frequency range or build-up, and says results depend on airtight framing and good seals. AluK lists 46 dB for its 56IW casement with 66.2a/20/44.1a glass, a laminated double-glazed build with a 20 mm gap, without naming the test standard. Neither figure describes your window. Our guide to soundproofing windows explains these ratings, and noise-reducing aluminium windows sets out the acoustic options we propose.

Laminated glass and break-ins

Laminated glass is difficult to break through, which slows an intruder, and it can remain intact in storms and earthquakes. Extra PVB layers raise penetration resistance further. AIS describes its security laminate as giving Level 2 and Level 3 protection against burglar attacks, but does not name the standard behind those levels, so read them as the maker’s own scale.
No glass makes a house burglar-proof. AIS also says its laminated security glass can remove the need for grills or shutters, a claim about intrusion only; glass does nothing to stop a child falling through an open window. Our guide to window grills and safety deals with that trade-off.

What laminated glass costs

AIS says only that laminated glass costs more than regular glass. The Studio Matrx guide to types of window glass (indicative, June 2026, before 18% GST) gives premiums over a plain pane of about Rs 60 to 150 per sq ft for toughened and Rs 120 to 300 for laminated. A separate Studio Matrx guide on toughened glass, read in October 2026, lists toughened-laminated at Rs 350 to 700 or more per sq ft for the glass itself. The baselines differ, so read these as direction, not quotes.
The premium is only part of the cost. Acoustic glass is generally thicker and heavier, AIS notes, so the frame has to be rated for the build before prices are comparable. For whole acoustic window budgets, see soundproof window prices in India.

MISTAKES

Four mistakes people make with laminated glass

Reading 6.38 as a default

Only one maker and one guide name 6.38 mm, and both treat it as an entry point. The right build for a big pane or an exposed wall depends on its size, the wind pressure and the frame, so ask for the build that passed a check.

Confusing laminated with double glazed

Double glazing is two panes separated by a sealed gap; laminated glass is panes bonded together. They do different jobs and combine well, with a laminated pane forming one side of a sealed unit. Our guide to double glazing in India covers the sealed unit itself.

Assuming the mark is there

Safety glass for buildings must carry the BIS Standard Mark under the 2020 order. Look for it on each pane at delivery, and on a large order ask the supplier for licence details rather than accepting a description on the invoice.

Leaving the build-up vague

A quote that says only ‘laminated’ tells you little. Ask for each ply thickness, whether the plies are annealed or toughened, the interlayer type and thickness, and, for a sealed unit, the gap and the other pane. Without these, quotes cannot be compared.

FAQ

Common questions about laminated glass

Short answers you can act on.
Toughened is usually the cheaper of the two. The Studio Matrx glass guide puts the premium over a plain pane at about Rs 60 to 150 per sq ft for toughened and Rs 120 to 300 for laminated, before 18% GST (indicative, June 2026). Toughened-laminated costs more again, so compare itemised quotes for the same build-up.
It depends on the job. Toughened glass is about four times stronger than annealed glass but breaks into granules that fall out. Laminated glass holds together when broken, helps with noise and resists intrusion. Where both strength and retention matter, as on large low panes or overhead glass, toughened-laminated combines them.
Double glazing is two panes held apart by a spacer with a sealed gap between them, which slows heat transfer. Laminated glass is two or more panes bonded together by an interlayer, which holds the glass in place when it breaks. They are not alternatives: a sealed double-glazed unit can use a laminated pane on one side or both.
It is two 3 mm glass panes bonded with a 0.38 mm PVB interlayer, giving 6.38 mm in total. In the same way, 5+5+0.76 means two 5 mm panes with a 0.76 mm interlayer, 10.76 mm overall. AIS describes 6.38 mm as basic protection against vandalism and smash-and-grab attempts, so larger or more exposed panes may need a thicker build.
Yes, compared with a single pane of the same thickness, and more so with an acoustic PVB interlayer and panes of unequal thickness. On its own it will not make a room quiet, because gaps and worn seals let sound through too. For traffic noise, a laminated pane inside a well-sealed double-glazed unit is the usual approach.
For safety glass used in buildings, yes. The Safety Glass (Quality Control) Order, 2020 requires safety glass for architectural, building and general uses to conform to IS 2553 (Part 1):2018 and bear the Standard Mark under a BIS licence. That standard includes laminated safety glass types. Check for the mark on the pane before it is fitted.

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Bring window sizes, photos and the facing direction to the Belagavi showroom, or send them through our quote form, and we will propose a laminated build-up in millimetres for each opening that needs one.
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