Document zzrV2xJzN53LmRDp5GGgZebx3

I Federal Register / Vol. 51. No. 119 / Friday, ]une 20, 1986 / Rules and Regulations 22659 other than those involved in fiber Local exhausts, area hoods, and Coating and Sealants introduction and milling, to be at levels below 0.2 f/cc. The level of exposure during braiding and twisting of treated asbestos yarn is controlled by local exhaust ventilation and is supplemented by general control measures, including central exhaust collection systems represent the normal control measures used to minimize asbestos exposure at the slitting and calendering stages. Housekeeping is also critical here. The rewinding step involves the bulk Many types of coatings and sealants have asbestos added as a reinforcing . agent and property modifier. In most instances, the final product is asphaltbased and is used for roof coalings and automobile undercoatings. dilution ventilation and systematic cleaning. In addition to wet mixing operations, sheet and gasket cutting packaging of paper products on spools, reels, or beams from larger rolls. The operation is dry, and the hoods and The production processes for surface coatings and sealants are similar. In the . production of these products, the fibers causes very little generation of airborne local exhaust may be used as dust- must be opened, or fluffed, as much as fibers. Thus. OSHA has determined that control measures during these possible. Thus, a fluffing operation to it is feasible for these operations to operations. agitate the fibers follows the fiber comply with the 0.2'f/cc PEL. Although airborne asbestos Fibers are introduction stage. Dry ingredients are Fiber introduction levels at these generated throughout the entire then mixed with the opened fibers plants were reported to be in excess of manufacturing process, exposure levels followed by the addition of the asphalt 0.2 f/cc. with exposures at two of the vary widely depending on the asbestos or coal tar and solvents. After mixing, plants reported to be in excess of 0.75 f/ content of the product. If comparable - the fiber is encapsulated and little cc. OSHA, however, believes that these control systems are used, airborne fiber asbestos dust is generated, The coatings. plants did not utilize the best available levels at a plant producing a gasket and sealant blends are-then packaged, technology and that it is feasible for paper containing 90 percenf asbestos are and prepared for shipment. fiber introduction stations to comply normally higher than levels at a plant For this industry, the major potential with the 0.2 f/cc PEL This determination producing specially papers, or beverage of feasibility was made because the or pharmaceutical filters containing 10 sources of airborne fibrous exposures precede the mixing operation due to fiber introduction process in the gasket percent asbestos. Emissions also can accidentia! spills during fiber receiving and packing industry is similar to that in vary depending on the physical process and storing, and from emissions during other primary manufacturing industries itself. Some plants perform fiber, where exposures are currently below 0.2. introduction and stock preparation (i.e,, f/cc (e.g., A/C pipe and floor tile). wet-mixing) as separate operations and fiber introduction. As in the manufacture of other asbestos products, OSHA has determined that it is feasible Asbestos Paper others combine these into a single operation.- to perform these tasks with with exposures below 0.2 f/cc. The fluffing In the manufacture of asbestos paper, Housekeeping in the stock preparation and mixing operations are kept under raw asbestos fiber is most often area represents a crucial control negative pressure, and housekeeping introduced in unopened pulpable bags, measure for minimizing operator around these operations is continuous. although for some types of paper the exposure to asbestos. Central vacuum OSHA based its feasibility . fiber is dumped horn the bags. In order cleaning systems and.mechanical floor- determination on data provided by the to decrease exposures in cases where sweeper-vacuum units often are used Monsey Products Company for the firm's the fiber is dumped from the bags, during.these operations. . Indianapolis. Garland, and Rockhil) asbestos may be obtained in OSHA based its feasibility plants. These data, Which are the. most noncompressed pulpable paper bags so determination on data provided by the comprehensive available on coating \ that bags may merely be slit and added Quin-T Corporation's plant in Tilton. facilities that have good work directly to the mixer; where it is New Hampshire. As shown in Table 15, practices,1 are summarized in Table 10. immediately wetted. The use of batch these data are the most recent and sizes requiring whole bags of asbestos comprehensive available for asbestos Table 16.--worker Exposures During the (rather than Va or V4 bags) can further paper production. The mean exposures Manufacture of Asbestos Coatings and minimize asbestos handling and the . potential.for dust generation. As in other manufacturing processes, the asbestos fiber is carried under negative pressure by conveyor to a mixer. There, the fiber for all areas were less than the 0.2 f/cc PEL OSHA concludes that it is feasible for this industry to comply with the 0.2 f/cc PEL. This position is consistent with RTl's findings for two paper firms that Sealants Job classification process Mean 6hr TWA exposure Woe) Standard deviation No. Of tions is wet-mixed with paper stock, binder, and other ingredients, the slock slurry responded to their survey [see Appendix Fiber introduction * _____ C of the RIA]. Otherr 0.13 .04' 0.15 . 05 34 13 ; a flows into the papermaking machine and. forms a sheet with a solids content of . less than 5 percent. Although the Table 15.--worker Exposure for asbestos Paper Manufacture * These data omit one outlier ot 1.03 f/oc. As alt ol. the other observations were .below 0.7 f/cc. with most below 0.15 f/cc, OSHA assumed that this observation was duo to' an equipment problems. moisture content is reduced greatly during transit through the paper machine, the wet nature of the material largely precludes the release of airborne ' Job classification process Mean 8. hr TWA . Standard exposure deviation (l/cc) No. of observe-, tkins. Source: U.S. Department at Labor. OSHA. Offioe ot Regu latory Analysis. As indicated in.the table, the average exposures for these work stations were asbestos.. Fiber introduction'.--....... 0.05 0.04 6 less than 0.2 f/cc at both stations in the The steam-heated rolls in the drying Wet mechanical section typically have canopy hoods and Day mechanical1 Other............ .09 .10 .14 .12 .06 .11 22 17 coating plants. OSHA, therefore, has 25 determined that it is feasible for this .' . exhausts to remove water vapor and heat. This type of hooding and exhaust industry sector to comply with the 0.2 f/ 1 These data omit one outlier at 0.56 f/cc As ail ot other data wero .0.1 f/cc or below. OSHA. assumed that this cc PEL This feasibility determination is augments the general ventilation In the area and aids in removing asbestos particulates released during the drying operation.. observation was duo to an equipment problem. 'These data omit one ouliierof 1.3 f/cc As an of the other observations wore 0.4 f/oc or below, OSHA assumed that this observation was also due to an equipment problem. Source: U.S. Department of labor, OSHA. Office ot Regu latory Analysis. 1 Data provided indicate that the four other plants did not appear to have the same quality of control technology [Exhibit 312A. Section L). GLEASON-000907