A few compositions based on monoammonium phosphate, diammonium phosphate, orthophosphoric acid, urea and M-80 (a melamine formaldehyde resin) have been studied in order to impart durable fire retardancy to cotton fabrics. The treated specimens are tested for their burning and smoke generation characteristics, as well as strength and washability. The treatments may prove quite effective in reducing the hazards in case of cotton fabrics.
A zonal formulation has been used to construct a non-linear model with a single state-variable corresponding to temperature. The governing equatisu are shown to be equivalent to a system with a swallowtail catastrophe. Using the model, conoitions may be identified which produce a jump and such a jump in the model's behaviour is being associated with one kind of flashover jump, i.e. that in which a fuel-controlled state becomes unstable. Thereby, the conditions for a flashover jump may be elucidated.
Sophistication in the aviation and warfare technologies has significantly increased the use of metals such as aluminium, magnesium and their alloys for numerous applications. The resulting fires of such metals are probably one of the most dominating and devastating risks if the metals are in the form of fine particles. The work consists of determination of the constituents of the various combustion products after the burning of the magnesium, aluminium and aluminium-magnesium alloy powder heaps on the sand bed. The analysis of the ground products of burnt metal powders on the sand bed has been carried out by using X-ray diffractometer. It is found that oxides and nitrides were the predominant fractions of the combustion products of the metal powders. Interestingly, it is also found that the combustion products of the aluminium, and the aluminium-magnesium alloy powder heap on the sand bed contain free aluminium also.