Abstract
Any bolus used in a hyperbaric oxygen chamber should, if possible, be composed of materials of low flammability at the tension of oxygen used. In addition, if a good level of accuracy is desired for treatment, it must be possible to mould the bolus easily and accurately. The two most common types of bolus used at many centres do not satisfy both of these conditions simultaneously. Wax may be formed accurately but presents a possible fire hazard, particularly if it contains unsaturated hydrocarbons which may vaporize during the pressurization cycle. Lincolnshire bolus and similar materials packed in bags usually contain hydrocarbons, and in addition may not be readily shaped to fill an entire volume as desired.
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