Effect of temperature on permeation through air supply hoses
When air supply hoses are exposed to chemicals in workplaces, the chemicals in contact with the hose may permeate through the hose wall and contaminate air being inhaled through the hose. A new gravimetric test method has been developed to quantify the changes in permeation when a hose is subject to elevated temperatures. When Esdan PVC hose was challenged with methyethyl ketone at temperatures between 20 ꃠand 70 ꃠin 10 ꃠincrements, the permeation rate increased exponentially and the breakthrough time and lag time decreased exponentially. A simple exponential model was used to estimate these parameters at higher and lower temperatures. At 40 ꃬ significant permeation could occur within an 8-hour shift.
Journal of Occupational and Environmental Hygiene