Airborne Exposure Limits :
- OSHA Permissible Exposure Limits (PELs) -
For Activated Carbon (graphite, synthetic):
total particulate = 15 mg/m3 (TWA),
respirable fraction = 5 mg/m3 (TWA).
For Silica: Crystalline Quartz:
total dust = 30/(%SiO2 + 2) mg/m3
respirable fraction = 10/(%SiO2 + 2) mg/m3.
- ACGIH Threshold Limit Values (TLVs) -
For Graphite, all forms except graphite fibers: 2 mg/m3 (TWA).
For Quartz, respirable fraction: 0.025 mg/m3, A2 - Suspected Human Carcinogen.
Ventilation System :
A system of local and/or general exhaust is recommended to keep employee exposures below the Airborne
Exposure Limits. Local exhaust ventilation is generally preferred because it can control the emissions of the
contaminant at its source, preventing dispersion of it into the general work area. Please refer to the ACGIH
document, Industrial Ventilation, A Manual of Recommended Practices, most recent edition, for details.
Personal Respirators (NIOSH Approved) :
For conditions of use wh ere exposure to dust or mist is apparent and engineering controls are not feasible, a
particulate respirator (NIOSH type N95 or better filters) may be worn. If oil particles (e.g. lubricants, cutting
fluids, glycerine, etc.) are present, use a NIOSH type R or P filter. For emergencies or instances where the
exposure levels are not known, use a full-face positive-pressure, air-supplied respirator. WARNING:
Air-purifying respirators do not protect workers in oxygen-deficient atmospheres. Where respirators are
required, you must have a written program covering the basic requirements in the OSHA respirator standard. These include training, fit testing, medical approval, cleaning, maintenance, cartridge change schedules, etc. See 29CFR1910.134 for details.
Skin Protection :
Wear protective gloves and clean body-covering clothing.
Eye Protection :
Use chemical safety goggles. Maintain eye wash fountain and quick-drench facilities in work area.