“Durability” is used to sell three unrelated properties: resistance to abrasion, resistance to indentation and resistance to water. A single number cannot describe all three. The useful move is to know which test produced the number, and what the test did not cover.
This page covers the ratings you will meet on commercial datasheets, plus the practical checks that decide whether a floor survives a real building.
AC ratings are for laminate
AC1 to AC5 is an abrasion classification used for laminate flooring under EN 13329. The test abrades the surface and measures how much material is removed before the decorative layer is exposed.
- AC1–AC2 describe domestic use.
- AC3 covers heavy domestic and light commercial use.
- AC4 is general commercial.
- AC5 is heavy commercial.
The number says something useful about surface wear. It says nothing about indentation from a point load, water ingress at a joint, or the flatness of the subfloor. A laminate with AC5 can still fail in a bathroom because the core swells.
20mil wear layer
General commercial. The usual starting point for offices and retail.
- Guest rooms
- Whole home
- Light commercial
- General commercial
- Heavy commercial
Use classes are for resilient floors
Resilient products such as vinyl, rubber and linoleum are classified under ISO 10874 by use class:
| Class | Typical area | What it implies |
|---|---|---|
| 21–23 | Domestic | Homes, from moderate to heavy domestic use |
| 31–34 | Commercial | Offices, retail, light industrial, from moderate to very heavy |
| 41–43 | Light industrial | Workshops and production areas with heavy traffic |
The class is a statement about the intended duty, not a guarantee. A class 32 floor in a busy lobby is being used outside its intended zone. It may look fine for a year and then show wear at the entrance route first.
Wear layers are for vinyl
On vinyl, the wear layer is the clear layer above the printed design. It is usually stated in mil or millimetres. One mil is 0.0254 mm, so 20 mil is 0.508 mm.
Thicker wear layers resist abrasion for longer, but they do not make a floor waterproof. Water gets in at seams, perimeters and damaged areas, not through the wear layer. A thick wear layer on a poorly prepared subfloor will still telegraph every ridge.
The wear layer also affects the finish. A heavier layer can hold a deeper emboss; a thin layer limits how much texture the manufacturer can put into the surface.
What the numbers do not tell you
The datasheet ratings leave out the conditions that decide most failures:
- Subfloor moisture. Adhesive and some cores are sensitive to it.
- Flatness. Point loads and hollow spots shorten the life of any floor.
- Cleaning. The wrong chemical or too much water damages a floor faster than traffic.
- Temperature. Resin and adhesive systems have application limits.
- Movement. Missing joints turn into cracks or tenting.
A specification that quotes only an AC class or a wear layer is incomplete. It needs the substrate and the cleaning regime attached to it.
Detail C · How to write durability into a spec
- Product
- Family, format, thickness and colour reference.
- Surface
- AC class for laminate, or wear layer in mil/mm for vinyl.
- Duty
- ISO 10874 use class, matched to the busiest zone, not the average.
- Substrate
- Moisture limit, test method, flatness tolerance and primer.
- Cleaning
- Approved products and dilution, plus what must not be used.
- Repair
- Spare stock, batch reference and the repair procedure.
Ask each supplier to confirm every line in writing. That is what makes three quotes comparable.
Reading a datasheet in two minutes
Start at the top: product family and format. Then find the wear layer or AC class. Then the use class. Then the substrate requirements and the cleaning instructions. If any of those is missing, the datasheet is marketing rather than specification.
Check the warranty conditions against your cleaning contract. A warranty that requires a specific product and frequency is only valid if the building actually follows it.
Where to go next
The AC ratings article goes deeper on the laminate versus resilient confusion. Commercial flooring types puts the ratings next to the materials. Maintenance schedules turns the cleaning conditions into a routine, and slip resistance ratings covers the other number that decides whether a floor is suitable.