There are some considerations with chemical protective clothing. For instance, no clothing is "impervious," since all clothing will eventually seep in chemicals. CPC also prevents evaporation, causing skin temperature to increase and potentially increasing the permeability of skin. CPC that has not been tested for the specific operating condition it is used in may not provide adequate protection. The same material, even at the same thickness, may provide different levels of protection depending on the manufacturer, since different manufacturers use different processes and may add different additives. Finally, while the test data will provide information on individual chemicals based on "worst-case scenario" continuous contact testing, most industrial exposures are not continuous and are in fact mixtures of chemical, for which permeation rates are different.
Coveralls are so called because they were first worn by men maintaining coal-fired boilers.To check for steam leaks or to clean accumulated soot from inside the firebox of a steam locomotive, someone had to climb inside, through the firehole (where the coal is shovelled in). A one-piece suit avoids the potential problem of loosened soot entering the lower half of one's clothing through the gap in the middle. As the firehole opening is only just large enough for a fit individual to negotiate, a one-piece suit also avoids the problem of the waistband snagging on the firehole as one bends to wriggle through, or of jacket tails snagging if one has to come out backwards.
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