What Is EN 685 Utilisation Class? Class 21 to Class 44 Explained for B2B Buyers
EN 685 is the European standard that classifies resilient floor coverings by their intended use environment and traffic intensity. The utilisation class is a two-digit number — the first digit indicates the environment (2 = residential, 3 = commercial, 4 = industrial) and the second digit indicates intensity (1 = moderate, 2 = general, 3 = heavy). Class 33/42 is the standard for commercial offices and retail. Class 44 is the maximum — required for NHS hospitals, airports, and supermarket chain sales floors — and can only be achieved with Dryback LVT in a permanent adhesive bond installation.
The EN 685 Classification System — How It Works
EN 685 was developed by the European Committee for Standardisation (CEN) to give architects, project managers, and procurement teams a standardised framework for specifying resilient floor coverings. Before EN 685, each manufacturer used its own performance terminology — making product comparison between suppliers impossible. The standard applies to all resilient floor coverings: SPC, LVT, homogeneous vinyl, linoleum, rubber, and cork.
The classification uses a two-digit code. The first digit defines the environment type: domestic (2), commercial (3), or industrial (4). The second digit defines the intensity of use within that environment: moderate (1), general (2), or severe (3). Consequently, Class 23 means severe domestic use, Class 33 means severe commercial use, and Class 43 means severe industrial use.
Complete EN 685 Class Reference Table
| Class | Environment | Intensity | Typical Application | SPC Wear Layer | Dryback Wear Layer |
|---|---|---|---|---|---|
| 21 | Domestic | Moderate | Bedroom, spare room — light foot traffic only | 0.2mm | 0.2mm |
| 22 | Domestic | General | Living room, dining room — standard residential use | 0.2mm | 0.2mm |
| 23 | Domestic | Severe | Hallway, kitchen, bathroom — high residential traffic | 0.3mm | 0.3mm |
| 31 | Commercial | Moderate | Hotel room, small office — light commercial traffic | 0.3mm | 0.3mm |
| 32 | Commercial | General | Classroom, small retail — general commercial | 0.3mm | 0.3mm |
| 33 | Commercial | Severe | Department store, open plan office — heavy commercial | 0.5mm | 0.5mm |
| 41 | Industrial | Moderate | Light industrial space — minimal rolling load | 0.5mm | 0.5mm |
| 42 | Industrial | General | General commercial — equivalent to Class 33 (dual classification) | 0.5mm | 0.5mm |
| 43 | Industrial | Severe | Heavy commercial — airport departure hall, large retail, logistics | 0.7mm | 0.7mm |
| 44 | Industrial | Very severe | NHS hospital ward, airport terminal, supermarket chain — pallet jack rated | Not achievable | 0.7mm + adhesive bond |
Class 33 and Class 42 appear together on most product data sheets as Class 33/42. They have identical performance requirements — the same floor covering satisfies both classifications simultaneously. Class 33 describes severe commercial use in the residential/commercial classification branch; Class 42 describes general use in the industrial classification branch. In practice, specifying Class 33/42 means the product is suitable for offices, retail, hotels, and similar commercial environments.
How Wear Layer Thickness Determines EN 685 Class
The wear layer is the transparent PVC film on top of the décor print. It is the primary wear surface — everything else in the plank structure is protected by it. Consequently, wear layer thickness is the single most important parameter in determining the EN 685 utilisation class a product can achieve.
Wear layer thickness is expressed in millimetres (mm) or mils (thousandths of an inch). The conversion is straightforward: 0.3mm = 12mil, 0.5mm = 20mil, 0.7mm = 28mil. Both expressions refer to the same measurement — the difference is regional convention. European specifications use mm; US specifications typically use mil.
| Wear Layer | Mil Equivalent | SPC Click — Max Class | Dryback LVT — Max Class | Typical Application |
|---|---|---|---|---|
| 0.2mm | 8mil | Class 21/22 | Class 21/22 | Light residential — bedroom, spare room |
| 0.3mm | 12mil | Class 31/33 | Class 31/33 | Residential and light commercial — apartment, hotel room |
| 0.5mm | 20mil | Class 33/42 | Class 33/42 | Commercial — office, retail, education, hospitality |
| 0.55mm | 22mil | Class 33/42 | Class 33/42 | Heavy commercial — equivalent to 0.5mm for EN 685 classification |
| 0.7mm | 28mil | Class 43 | Class 44 (with adhesive) | Heavy commercial (SPC) · NHS hospital / airport / supermarket (Dryback) |
Why Class 44 Cannot Be Achieved With Click Flooring
This is the most commonly misunderstood aspect of EN 685 classification — and the most consequential specification error in commercial procurement. Class 44 is not determined by wear layer thickness alone. The EN 685 standard requires both a 0.7mm wear layer and a permanently adhesive-bonded installation to achieve Class 44. A floating click floor — regardless of thickness or wear layer — cannot achieve Class 44 because the click joint is not a permanent bond.
The reason is physical: Class 44 environments involve pallet jacks, hospital trolleys, and airport baggage trolleys — rolling loads that exert concentrated lateral force on floor joints. A floating click joint deflects under lateral load; a permanent adhesive bond does not. Consequently, any project specifying Class 44 — NHS hospital ward, EU airport terminal, supermarket chain sales floor — requires Dryback LVT in a glue-down installation. There is no exception to this rule in the EN 685 standard.
Specifying 8mm SPC click with 0.7mm wear layer for an NHS hospital or airport project does not achieve Class 44. The maximum EN 685 class for any click-format floor covering is Class 43. If your project specification requires Class 44 — whether for NHS HTM 61, EU airport ACI compliance, or supermarket chain facilities standards — the correct product is 3mm Dryback LVT with 0.7mm wear layer in a hard-set adhesive installation. No other product achieves Class 44.
EN 685 Class by Project Type — Procurement Reference
The following reference matches common UK and EU project types to their required EN 685 utilisation class. Specifying below the required class creates warranty liability; specifying significantly above it increases cost without performance return. Furthermore, project specifications that reference EN 685 class — rather than a specific product — give procurement teams the flexibility to source from multiple manufacturers while maintaining quality floor.
EN 685 and EN 16511 — What Is the Difference?
EN 685 and EN 16511 are related but distinct standards that are often confused in procurement documentation. EN 685 is the older, broader standard that classifies all resilient floor coverings — vinyl, linoleum, rubber, and cork — by utilisation class. EN 16511, published in 2014, is a product-specific standard for semi-rigid and rigid-core floor panels (which includes SPC and LVT click planks) that incorporates EN 685 classification requirements but adds additional product-specific performance tests.
For the German market specifically, EN 16511 certification is mandatory for any rigid-core floor covering listed in a Leistungsverzeichnis (tender specification). A product with only EN 685 certification is not accepted in German project specifications — the EN 16511 certificate is required separately. Furthermore, Eurofins Indoor Air Comfort Gold certification is additionally required for most German commercial office, school, and healthcare specifications under AgBB VOC assessment standards.
For other EU markets, CE EN 14041 Declaration of Performance — which incorporates EN 685 utilisation class — is sufficient for commercial project specification and customs compliance.
How to Read EN 685 Class on a Product Data Sheet
On a product technical data sheet (TDS), EN 685 classification is usually stated in one of these formats:
A statement like «EN 685 Class 33/42» means the product satisfies both Class 33 (severe commercial) and Class 42 (general industrial) — the two classifications with identical requirements. A statement like «EN 685 Class 43» means the product satisfies severe industrial use. A statement like «EN 685 Class 44» — which you will only see on Dryback LVT products with 0.7mm wear — means the product satisfies very severe industrial use and is rated for hospital and airport environments.
The EN 685 class on the TDS is always supported by a CE Declaration of Performance (DoP), which is the legally binding document that confirms the stated performance. When purchasing flooring for a commercial project — particularly in the UK (UKCA) or EU (CE DoP) — always request the DoP alongside the TDS. The DoP contains the certificate number, the notified body that conducted testing, and the test report references. Consequently, if a manufacturer cannot provide a DoP with a specific certificate number, the stated EN 685 class cannot be relied upon for project tender submission.
Frequently Asked Questions
Every Ecoflors sample kit includes the TDS with EN 685 class confirmation and the CE Declaration of Performance with certificate number — the two documents required for commercial tender submission. Sample kits dispatched within 5 business days to UK, EU, US, AU, and ME addresses.