Fibrous Dust Release from Asbestos Substitutes in Friction Products
Jaffrey, SAMT; Rood, AP; Scott, RM
| HERO ID | 2072398 |
|---|---|
| In Press | No |
| Year | 1992 |
| Title | Fibrous Dust Release from Asbestos Substitutes in Friction Products |
| Authors | Jaffrey, SAMT; Rood, AP; Scott, RM |
| Journal | Annals of Occupational Hygiene |
| Volume | 36 |
| Issue | 2 |
| Page Numbers | 173-181 |
| Abstract | The extent of airborne release of fibers from asbestos substitute materials used in high friction products was evaluated. Dust was collected after rubbing brake and clutch linings containing man made mineral fibers and Kevlar with emery paper. Four air samples were collected and examined by transmission electron microscopy (TEM) and energy dispersive X-ray analysis. At x3000, TEM examination showed Kevlar fibers in the respirable range which were capable of deep penetration into the lungs. Of the fibers, 96% had diameters below 2.5 microns and all were more than 80 microns in length. Significant amounts of dust were produced by the clutch plates; samples included carbon (7440440) and inorganic fibers of silicon (7440213) (Si), aluminum (7429905) (Al), calcium-sulfate (7778189), and calcium (7440702) (Ca), as well as some metallic fibers like copper (7440508). The truck brake shoes for trucks had inorganic fibers containing Si, Ca, Al, sulfur (7704349), magnesium (7439954), sodium (7440235), and a small amount of chrysotile (12001295) was also found, while Kevlar was not detected. The majority of car brake shoe fibers were glass. The authors conclude that replacement fibers generate substantially fewer fibers than asbestos, but that the size and inertness of Kevlar fibers may indicate the potential for pulmonary retention. |
| Pmid | 1530232 |
| Wosid | WOS:A1992HR67600005 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | DCN-206746; Airborne dusts; Carcinogens; Dust inhalation; Fibrous dusts; Mineral dusts; Occupational hazards; Respirable dust; 7440-44-0; 7440-21-3; 7429-90-5; 7778-18-9; 7440-70-2; 7440-50-8; 7704-34-9; 7439-95-4; 7440-23-5; 12001-29-5 |