1. of the fibers within the Iung was very differ- vides a sound basis to identify the potential
2. ent for the two fiber types. This suggests that hazards of fibrous materials in man. Further
3. fibers that are more readily altered chemically these results suggest that the toxicologic
4. within the Iung may be less biologically potential of an MMVF may be dependent
5. active. Further analyses of the data are neces- upon its chemical composition. Finally these