A novel approach for the in-situ chemical elimination of chrysotile from asbestos-containing fireproofing materials
We report here the development of a method for the chemical digestion of chrysotile asbestos in asbestos-containing fireproofing to levels lower than the regulatory threshold. The resulting fireproofing, no longer defined as asbestos-containing, can remain in place with properties intact. In the process, chrysotile fibers are digested without generating excessive gaseous byproducts, and the foam-based delivery system essentially eliminates release of airborne fibers. New X-ray diffraction methods quantified chrysotile levels with far greater precision than standard optical microscopic methods. Full-scale field testing confirmed the laboratory phase of the project. Fire testing of the treated fireproofing showed that the treated material functions as well as the original fireproofing.
Block, J., Petrakis, L., Dolhert, L. E., Myers, D., Hegedus, L. L., Webster, R. P., & Kukacka, L. E. (2000). A novel approach for the in-situ chemical elimination of chrysotile from asbestos-containing fireproofing materials. Environmental Science and Technology, 34(11), 2293-2298. DOI: 10.1021/es990432d