Abstract
AbstractA large set of carpets was tested vertically in the NBS smoke chamber (ASTM E662), in two ways: along the length and along the width of their grain pattern. The set comprised 104 carpets. The results were analyzed in order to investigate the potential effect of carpet grain direction on the results obtained. It was shown that there is no statistically significant difference between the orientation of the carpet (width or length). Moreover, the degree of agreement was the same whatever the result of the test. Several other variables were found to have an effect. The most important of these is the sample weight, but others are carpet construction, yarn type and backing material. It was found that the testing mode (flaming or non‐flaming) did not appear to affect the results of this set of samples in a statistically significant way.
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