A carpet tile can have an excellent pile and still fail in a corridor within months — at the joints. The cut edge is where the pile is no longer locked in by surrounding construction, where the backing is exposed, and where every rolling chair wheel and shoe heel lands on an unsupported edge.
ISO 10833, Textile floor coverings — Determination of resistance to damage at cut edges using the modified Vettermann drum test, exists to reproduce that damage in the laboratory. The current edition is ISO 10833:2025, which applies to broadloom (sheet) materials as well as tiles and planks. The previous edition, ISO 10833:2017, was adopted in Europe as EN ISO 10833:2019 and replaced the older EN 1814; check which edition your customer's specification calls up.
Same drum, different test
Laboratories that already run the Vettermann appearance test — now ISO 23106, formerly part of ISO 10361 — often assume ISO 10833 is the same test with a different report. It is not.
| ISO 23106 (appearance) | ISO 10833 (cut edges) | |
|---|---|---|
| Question | How does the pile surface change in use? | Do the cut edges and joints survive? |
| Specimen layout | Continuous lining of the drum | Specimens arranged so that edges or joints are stressed |
| Loading | Standard Vettermann ball and studs | Modified loading arrangement for edge damage |
| Assessment | Change in appearance, graded against references | Type and extent of edge damage |
The drum and drive are shared, which is why a single machine can serve both methods. What changes is the loading kit, the specimen preparation and the assessment. Our drum testers, for example, are supplied with separate loading assemblies for ISO 23106 and ISO 10833, and mixing them is one of the first things to rule out when results look strange.
How the specimen is built
The heart of ISO 10833 is that the edges under test are deliberate:
- Sheet material is cut along its length at an acute angle, so that the cut edge crosses the pile rows and is stressed as it would be at a seam. The 2017 revision updated the preparation and cutting of sheet specimens; if your procedure was written for the 2001 edition, update it.
- Tiles are placed together so that the original edges of the tiles form the joint. Those factory edges are what the customer will install, and they are what is being tested.
The most common error is cutting tiles in the lab to fit the drum and then assessing the lab-cut edge. A fresh, clean knife cut behaves differently from a production edge that has been punched, sealed or finished. Plan the specimen layout so that the factory edges form the joint.
What counts as damage
ISO 10833 asks the assessor to look for specific failure modes rather than a general "appearance" grade:
- Delamination — separation of the use-surface or primary backing from the secondary backing or foam;
- Fraying — loss of pile or substrate material from the cut edge;
- Tufting out — tufts pulled out of the use-surface;
- Sprouting — overlong tuft legs, trapped in the pile during manufacture, appearing during use;
- Laddering / shooting — loss of consecutive loops in the same column.
These describe different manufacturing problems. Delamination points to the backing adhesive or curing; fraying and tufting out point to tuft bind; laddering points to loop construction. Report each one separately — a single overall grade throws away the information the manufacturer needs.
The 2017 revision also updated the assessment and evaluation of fraying resistance; another reason not to work from an old procedure.
Errors that change the result
1. Wrong loading kit
The modified Vettermann loading for ISO 10833 is not the ISO 23106 ball. Label the kits, store them apart, and record on the worksheet which one was fitted.
2. Worn studs or ball surfaces
The rubber studs on the loading body are consumables. Worn, glazed studs grip less and damage less. Track hours of use and replace on a schedule, not when they look worn.
3. Loose fibre left in the drum
Fibre and backing crumbs released from the edges accumulate in the drum. If they are not removed, they cushion the impact and change the damage. Remove loose material in the way and at the intervals the method specifies; if your drum has a suction nozzle, keep it at its set position.
4. Specimens not conditioned
ISO 10833 refers to ISO 139 for conditioning and testing. Tile backings — bitumen, PVC, polyolefin — and nylon or wool pile are moisture- and temperature-sensitive; a tile tested straight from a cold warehouse will not behave like a conditioned one.
5. Poor fixing to the drum
Specimens that shift during the test produce damage the method did not intend — usually at the leading edge. Fix specimens exactly as the standard describes and check them after the first period of running.
6. Assessing under random light, alone
Edge damage is judged visually. Use consistent, directional lighting and, wherever possible, two assessors. One assessor working under ceiling lights will drift over months.
Where the result is used
Cut-edge resistance is frequently called up in contract floor-covering specifications, and tile manufacturers use it to qualify changes to backing and edge sealing. Because both uses compare results over time, the laboratory's own repeatability matters more than any single number.
Report checklist
- Edition of ISO 10833 used, and sheet or tile route.
- Confirmation that factory edges formed the joint (tiles), or the cut angle used (sheet).
- Loading kit fitted, and stud condition or hours.
- Conditioning atmosphere and time.
- Each failure mode recorded separately, with assessor names.
Our Vettermann drum testers — single, three and six-station — carry loading kits for both ISO 23106 and ISO 10833 and are built in our own workshop in Istanbul. See the ISO 10833 page and the ISO 23106 page.