CAS# 409-21-2

Carbon Silicide; Carborundum; Silicon Monocarbide

Fibrous Dust 15mg/m3 (o) total dust 5mg/m3 (o) respirable dust Non-Fibrous Dust 10mg/m3 *,∆ 3mg/m3 **,∆ (as Silicone Carbide only)

N

t-A2 *Inhalable fraction of the aerosol **Respirable fraction of the aerosol ***Respirable fibers length >5µ; aspect ratio ≥3:1, as determined by the membrane filter method at 400-450x magnification (4-mm objective), using phasecontrast illumination. ∆Particulate matter containing no abestos and <1% crystaline silica; ACGIH NIC to 0.1 f/cc (t) including whiskers