E 30 – EI 120
Fire-Resistant Glass
Integrity and insulating fire glass supplied and fitted into tested frames.
Learn more →
EI 30, EI 60, EI 90, EI 120
Insulated Fire Glass (EI)
Insulated fire glass, classified EI, is glazing that maintains integrity and keeps the temperature rise on the non-fire side within set limits for the rated time. It is usually made of several glass panes bonded with interlayers that foam into an insulating barrier when heated, or with a clear gel that absorbs heat.
EI 30EI 60EI 90EI 120
Get a free survey or quote
Tell us what you need. We reply with next steps and a guide price.
- Free quotation visitfor installation work
- Written quotesafter survey, for the agreed scope
- UK-wide coverageall four nations
- Tested systems onlyglass, frame, seals as tested
- Evidence on handoverclassifications and photos
What does our insulated fire glass service include?
EI glass is the choice where people need to pass close to the glass during a fire, where combustible materials sit near it, or where building guidance would otherwise restrict glazing. We supply and fit EI 30 to EI 120 glass in tested frames, internally and externally.
- EI 30, EI 60, EI 90 and EI 120 glass
- Internal and external-grade build-ups
- Insulating glass in sealed double-glazed units
- Impact-classified insulating glass
- Matched glazing systems and seals
- Handling and installation of heavy panes
What should you check before ordering?
How it works
When heated, the interlayers turn opaque and expand, forming an insulating shield. After a fire the glass will need replacing.
The temperature rule
EI testing limits the average temperature rise on the unexposed face to 140°C and any single point to 180°C, which is why people can pass it.
Thickness and weight
Each step up in rating adds layers, so EI 120 is far thicker and heavier than EI 30. The frame has to be designed for it.
Exterior positions
Some EI products are internal only. External use needs a product and edge seal approved for UV and weather.
Storage on site
Insulating fire glass should be stored dry, upright and away from direct sun before fitting.
Optical quality
Modern EI glass is clear in normal use, with high light transmission at lower ratings.
What evidence do you get?
- EI classification to BS EN 13501-2
- Frame system evidence covering the glass
- Glazing schedule with marks
- Installer's completion record
Guide prices for insulated fire glass
EI 30 from £350/m², EI 60 from £550/m², EI 120 priced on survey, supplied and fitted, excluding VAT. Prices depend on the rating, pane sizes, frame system, access and programme. Use the guide price tool for a range, or see all guide prices.
Frequently asked questions
What does EI 60 mean?
The glazing system kept fire on one side (integrity) and limited the temperature rise on the other side (insulation) for at least 60 minutes in a standard fire test.
Is EI glass clear?
Yes, in normal conditions. It turns opaque only when heated in a fire.
Can EI glass be used outside?
Only products approved for external use, usually in a sealed unit with UV protection.
Why is insulated fire glass so much more expensive?
It is a multi-layer product with specialist interlayers, and the frame and installation must suit its weight.
Does EI glass need replacing after a fire?
Yes. Once the interlayers have reacted, the glass has done its job and must be replaced.
Related services
Often specified alongside insulated fire glass
E · EW
Integrity Fire Glass (E & EW)
E and EW glass where flames and hot gases must be stopped.
Learn more →
E 30 – EI 60
Stair, Lobby & Corridor Glazing
Glazed screens and doors on protected stairs, lobbies and corridors.
Learn more →
E 30 – EI 60
Frameless Fire-Rated Glazing
Butt-jointed fire glass walls with minimal frames.
Learn more →Areas
Insulated Fire Glass (EI) by area
Select your county or region for local coverage, towns and the rules that apply there.
England
BedfordshireBerkshireBristolBuckinghamshireCambridgeshireCheshireCornwallCounty DurhamCumbriaDerbyshireDevonDorsetEast Riding of YorkshireEast SussexEssexGloucestershireGreater LondonGreater ManchesterHampshireHerefordshireHertfordshireIsle of WightKentLancashireLeicestershireLincolnshireMerseysideNorfolkNorth YorkshireNorthamptonshireNorthumberlandNottinghamshireOxfordshireRutlandShropshireSomersetSouth YorkshireStaffordshireSuffolkSurreyTyne and WearWarwickshireWest MidlandsWest SussexWest YorkshireWiltshireWorcestershire
Scotland
Process
How we deliver insulated fire glass
Tell us what you need
Send sizes, the rating required, photos of glass marks or your inspection report.
Survey
We measure, record existing marks and check frames, substrates and fire-stopping.
Written quote
Your quote names the tested system, classification and evidence it relies on.
Install and hand over
Installed to the system details, then a handover pack with photographs and references.