When talking about fire performance of suspended ceiling tiles, there are two different aspects that need to be considered: the fire reaction of the tile (whether the tile contributes to flame spread) and the fire resistance of the ceiling system (i.e. how long the ceiling system stops the fire from burning through the ceiling tile). These aspects are measured separately, and confusing the two is the most common error when writing specifications. A tile may be excellent at one aspect and totally irrelevant to the other. This guide defines all the terminology you will find in the data sheets, including the obsolete Class O and the present Euroclass systems, and also clarifies what the 30, 60, and 90 minute figures refer to.
Reaction to fire: Euroclass and the previous Class O
Reaction to fire: Current UK and European standards are the…Euroclass system (BS EN 13501-1) rankings start at A1 (non-combustible) down to A2, B, C, and so on.
Most ceiling tiles made of mineral fibre and stone wool getA1 or A2 – practically non-combustible – which is the reason they are the standard in commercial construction. You will still come across the former British expression Class O referenced in the legacy specifications, it described a surface that resists flame spread. Although Class O has been superseded by the Euroclass system, the terminology lingers on older drawings which is why it helps to recognise it.
Fire resistance: the 30, 60 and 90-minute figures
Fire resistance is entirely different. It describes the amount of time a complete ceiling system holds back fire, maintaining its integrity and insulating function. This is expressed in minutes: 30, 60 or 90 minutes (and occasionally 120). This refers to the entire assembly, not just the tile.
Importantly, a fire-rated ceiling only performs to its rating when the. The correct tile, correct grid, and correct fixings are used together as a tested system. Playing a different tile or an incorrect grid voids the rating even if the replacement tile looks the same. For any fire-rated ceiling, you have to match the system and not just the tile.
Why the distinction matters on site
A specifier that requests a ‘fire-rated tile’ needs to be specific about which property they are referring to. For the majority of offices and retail units, the need is for a positive reaction-to-fire class (A1/A2) — and practically any grade mineral fibre tile meets that requirement. A true fire-resistance requirement (30, 60, 90 minute) certificates typically apply to specific compartment ceilings, protected escape route, or floors that require fire separation, and there the entire tested system has to be specified and installed exactly as certified.
What to check before ordering
Common products and their fire performance
Mineral fibre ranges such as Zentia and Knauf AMF Thermatex. Tiles usually have strong reaction-to-fire classifications that are suitable for general commercial use. Rockfon Stone wool tiles are recognized for exceptional fire performance, which is attributed to the fact that stone wool is non-combustible. As such, they are typically selected for instances where fire, moisture and acoustics are of concern simultaneously. Always check the individual product datasheet as values vary based on tile thickness and edge detail.
A note on responsibility
The designer of the building, fire engineer, and building control determine fire performance from a regulatory standpoint. This guide clarifies terminology for proper specification and ordering; however, in cases with an established fire strategy for a building, adhere to the outlined system, and obtain expertise before modifying any part.
Frequently Asked Questions
What are the differences between Class O and Euroclass?
Class O is an outdated British classification for resistance to surface flame spread. While it has been replaced by the European Euroclass system (A1, A2, B, C, etc.), Class O is still seen in old specifications.
Does the 60-minute fire rating pertain to the tile or the ceiling?
To the full system. Fire-resistance ratings of 30, 60 or 90 minutes indicate the length of time an assembly of tested tile, grid and fixings can withstand fire. This rating applies only when the certified system is used precisely how it was tested.
Are all mineral fibre ceiling tiles non-combustible?
Most achieve a Euroclass A1 or A2 rating, meaning non-combustible or very limited combustibility. The precise rating varies based on the product, so it’s important to reference the manufacturer datasheet.
Can I replace a fire-rated tile with a similar one?
Not without confirmation. A fire-resistance rating applies to a specific tested tile-and-grid combination. Using a different tile, even one that looks the same, can nullify the rating. Ensure the certified system is matched.
Explore fire-rated products across various brands on our Suspended Ceiling Tiles category page, with datasheets available on request.
Need to verify the appropriate fire-rated system for your project? Contact our team at01939 251 450 for product specifics, or request a bulk quote with full documentation.
WhatsApp Scan to start a chat with us!