DIFFUSION RATES OF METHYL CHLOROFORM THROUGH SOME INSULATION MATERIALS.
NAVAL RESEARCH LAB WASHINGTON D C
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Diffusion rates of methyl chloroform through insulation and decorative materials cemented to aluminum surfaces with Bondmaster No. 596 neoprene contact adhesive have been studied in addition, the permeability coefficients for Ensolite and surface-covered corkboard to the abovementioned chlorinated hydrocarbon were measured. Rate-ofdiffusion measurements indicate that methyl chloroform is trapped behind surface-covered corkboard for a longer time 6 months and emanates from the corkboard surface at a slower rate than for any other insulation material studied. One-inch Ensolite retains methyl chloroform longer than corkboard whose surface has not been covered or 12-in. Ensolite. Of the materials studied, the one with the greatest diffusion rate of methyl chloroform was uncovered corkboard. Methyl chloroform did not diffuse through the decorative laminate materials. On the basis of the data presented, a change of the corkboard cementing procedures in submarines has been recommended. Corkboard should be installed before being coated, and 12-in. Ensolite should replace the 1-in. material where possible. Author