Permeation of chemical protective clothing By three binary solvent mixtures.
Mickelsen-RL; Roder-MM; Berardinelli-SP
Am Ind Hyg Assoc J 1986 Apr; 47(4):236-240
The permeation of chemical protective clothing (CPC) by binary solvent mixtures was studied. A total of six solvents were selected for testing on the basis of their widespread industrial use and were paired so as to form three different binary mixtures. These mixtures consisted of a chemical with a breakthrough time of greater than 2 hours and a permeation rate of less than 10 milligrams per square meter per second (mg/m2/second), paired with a chemical having a breakthrough time of approximately 1 hour and a permeation rate of some 100mg/m2/second; a chemical with a breakthrough time of greater than 2 hours and a permeation rate of less than 10mg/m2/second, paired with a chemical having a breakthrough time of less than 5 minutes and a permeation rate of greater than 1,000mg/m2/second; and a pair containing chemicals that both had breakthrough times of approximately 1 hour and permeation rates of some 100mg/m2/second. CPC samples were taken from the palms and backs of finished gloves, with the same lot being sampled for each material. Mixtures containing methanol (67561) and n-butyl-acetate (123864), as well as toluene (108883) and p-xylene (106423), were used to evaluate nitrile-butyl rubber glove specimens. Gloves marketed under the registered tradename of Viton were tested using a mixture of n-hexane (110543) and methyl-ethyl-ketone (78933). Employee risk was found to be increased when binary solvent mixtures combined an early breakthrough time with an enhanced permeation rate. The permeation of binary mixtures through CPC could not be predicted via the permeation rates of the individual mixture components. The authors recommend that the permeation characteristics of CPC can be tested using chemical mixtures and work conditions that typify on the job exposures.
NIOSH-Author; Solvent-vapors; Materials-testing; Health-engineering; Sampling-methods; Chemical-properties; Occupational-medicine; Industrial-environment; Risk-analysis; Safety-research; Protective-coatings
67-56-1; 123-86-4; 108-88-3; 106-42-3; 110-54-3; 78-93-3
American Industrial Hygiene Association Journal