Critical oxygen index test

Wharton RK. Correlation between the critical oxygen index test and other fire tests. Fire Mater. 1981 5 93-102. 

Wharton RK. The relative performance of critical oxygen index testing columns under ambient conditions. J. Fire Flammability 1981 12 266-271. 

Wharton RK. Identification of two pass regimes for nylon-66 based rods in the critical oxygen index test. J. Appl. Polym. Sci. 1982 27 3193-3197. 

Wharton, R. K. Anomalous behaviour in certain versions of the critical oxygen index test. Fire and Materials, 5, No. 1, 6 (1981)... 

Since the publication of the third edition, additional data have been critically reviewed. New or additional data included in this edition are bioconcentration factors, aquatic mammalian toxicity values, degradation rates, corresponding half-lives in various environmental compartments, ionization potentials, aqueous solubility of miscellaneous compounds, Henry s law constants, biological, chemical, and theoretical oxygen demand values for various organic compounds. Five additional tables have been added Test Method Number Index, Dielectric Values of Earth Materials and Fluids, Lowest Odor Threshold Concentrations of Organic Compoimds in Water, and Lowest Threshold Concentrations of Organic Compounds in Water. 

In products with a large wall thickness, the influence of weathering is often limited to a surface layer, either due to limited oxygen diffusion or to limited UV penetration. The depth of this layer may be small ( 0.5 mm) compared with the whole wall thickness ( 4 mm) but it can causes brittle fracture. Mechanical behavior depends on the oxidation (degradation) profile, a critical degradation profile accounted for the failure of samples, that is time of failure. Tensile tests were performed on films microtomed from the samples [39]. The density of weathered samples can increase because of chemicrystallization, increase in polar groups, oxygen uptake or the loss in volatile products. The decrease in the nominal strain corresponded to an increase in the vinyl index and in the density. The carbonyl index showed too much scatter. 

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