the purpose of the national workshop on substitutes for asbestos was to obtain more information on the technical and economic feasibility and possible health problems of substitutes for asbestos, for use in considering regulation of asbestos. some of the topics discussed include: non-asbestos friction materials; discussion on friction products; gaskets and packings; asbestos in plastics; discussion on plastics and flooring; single-ply roofing as a substitute for asbestos roofing felt; mill applied coatings for underground pipelines; discussion on pipeline wrap; discussion on textiles; asbestos substitutes in roof coatings, sealants, and cements; substitutes for asbestos-cement sheet; inhalation, deposition, and clearance of particles; man-made vitreous fibers and health; discussion on the translocation and fate of sized man-made mineral fibers; exposures to mineral wool; toxicology, aspects ceramic fibers and aramid fibers; discussion on wollastonite; health considerations in the perlite industry; cross-sectional epidemiologic and industrial hygiene survey of talc workers; and occupational exposures in the manufacture and application of polyurethane and urea formaldehyde insulation systems