Carpet Tile Testing（I）

Specifying floor covering for a commercial application requires at least a passing understanding of how it will perform in the workplace. Unfortunately, markings like "contract quality" or "heavy domestic" are open to interpretation, making it difficult for the specifier to make an informed decision.
Hereby we will offer some insight into the standard tests that can be applied to carpet that has to perform - and last - in the punishing commercial environment.
Commercial premises place heavy performance requirements on any sort of floor covering. When coffee gets spilt at home there\'s an immediate flurry of mopping and spraying with stain remover. In the workplace it\'s more likely to be ignored and then walked on by unwiped outdoor shoes. Your sofa at home gets moved when you need to remove dust or dinky toys from underneath it. The castor chairs in your office travel miles, boring holes in the carpet tiles as they do so.
This means that we need a benchmark by which we can judge the suitability of carpet or carpet tiles for commercial contract use. Fortunately there are standardised tests to provide Euronorm (EN) and International Standards Organisation (ISO) certification. Genuine heavy contract products should carry the standards described here.
ISO 8543 - Effective Pile Weight

Carpet tiles need dense, closely-grouped pile to provide the required wear resistance. To provide a standard for this, ISO 8543 specifies a method of shaving the carpet down to its backing. It simply measures the mass of the pile removed in grams per square metre. In general, the greater the pile mass, the harder-wearing will be the carpet tile.
ISO 1765 - Total thickness

This is another relatively simple test. In this case the carpet tile is compressed by a standard weight, and then its thickness is measured to the nearest 0.1mm.
EN 1963 - Lisson Treadwheel Test

This test measures the carpet\'s resistance to scuffing, in particular highlighting how strongly the pile tufts are secured. The treadwheel is positioned above the carpet to be tested and rolled to and fro across the sample 400 times. The wheel turns slightly faster than it moves across the carpet creating a severe scuffing effect. The tested carpet sample is compared to the master samples and is rated accordingly. This is a particularly aggressive test, literally ripping some types of carpet tile to shreds. A pass under EN1963 is a strong indicator of good wear resistance.

ISO 10361 - Accelerated Wear Testing

This standard is particularly relevant for carpet tiles that will be used in an office. It\'s composed of two tests, the Vetterman drum test and the castor chair test.

Vetterman Drum Test
The Vetterman Drum Test is intended to simulate heavy, focused footfall. Foot traffic tends to be concentrated around doorways or narrow passages between desks, and these areas can quickly become threadbare.
The carpet for testing is fixed inside a revolving metal drum. A heavy (7.5Kg) ball, covered in hard rubber protrusions, is placed inside the drum and is allowed to bounce around freely. The carpet is subjected to two test programmes, one of 5,000 rotations of the drum and one of 22,000 rotations.
The carpet is then visually judged against master wear samples and is given a rating for how well it has withstood the effects of the test.

The visual inspections of the carpet give results from 1 to 5 for both 5,000 and 22,000 rotations and the final result is a combination of the two results according to the formula below;
Total Result = 0.75 x Result after 5,000 rotations + 0.25 x result after 22,000 rotations
A result of 2 or more is a pass
A result of 2.4 or more is a pass for intensive use
For more tests, we will talk later.