Document 6BeRLyNKBME2n0kXz2m4JjLrg

attachments such that the dust created is arrested at the source and collected in filter hags. Commercial devices are available but normally firms with a sincere interest in pollution control, design and fabricate-their own devices. Two examples cf such *' devices are shown in Figures 6 and -7. These control hoods work on the high velocity, low volume principle and can be readily adapted to industrial vacuum cleaner systems. When arrest-at-the-source systems are not possible, tech niques 'similar to those employed by the asbestos spraying industry may be utilized. Rules-which relate more specifically to fabrication of asbestos products may be found in such public cations as: 1. "Recommended Practices for .Fabricating', Handling aiid Construction Industries,' Health, and Safety Council-Asbestos Cement Products Association. 2. "Recommended Health Safety Practices for Handling . and Applying Thermal Insulation Products Containing .. . Asbestos," National Insulation Manufacturers . . Association (NIMA)... 3. The Asbestos Research Council Guides (London. England). Control and safety 4. "Recommendations for Handling Asbestos," Engineering Equipment Users Association (EEUA), E.E.U.A. Hand. book No. 33. 3.3.3 Friction Material.Applications Typical friction materials contain 30 to 50% asbestos and may be up to 70%, and the industry that manufactures these ma terials is ranked third (1969) in the consumption of asbestos fibers. Crysotile is the preferred variety because it has better frictional properties than amphibol asbestos and does not exert so much wear on the opposing surface. The major uses of asbestos-containing friction materials include brake linings, brake discs and clutch facings. These products have been applied to a wide variety of industrial and commercial products. -1 IT RESEARCH INSTITUTE V 22