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A comparison of the results of ten commercial carpets evaluated in the NBS Flooring Radiant Panel Test for spread of flame and in the ISO 5657 Ignit ability Test for ease of ignition indicated an inverse correlation between these two flammability properties.

A modified factorial experimental design, a central composite rotatable plan, has been applied to a silicate—hydrogen peroxide system to determine the optimum bleaching conditions. In addition to high whiteness, the optimisation was limited by constraints on time and damage, as measured by alkali solubility. The predicted optimum obtained was verified by experiment and gave at least a 60% saving in time compared with phosphate‐peroxide systems in commercial use.

Hydrogen peroxide bleaching in the presence of a silicate‐based stabiliser improved the effectiveness of most of the chemical and polymer shrink‐resist aftertreatments evaluated, when compared with unbleached or wool bleached in the presence of a phosphate‐based stabiliser. Bleaching before shrink‐resist treatment was found to cause less cumulative damage to the fibre than the reverse sequence, particularly in the case of chemical shrink‐resist treatments.

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