Material Safety Data Sheet

8. Exposure Controls/Personal Protection
Carbon dust is considered a nuisance dust.
OSHA Permissible Exposure Limits-Time Weighted Average
15 mg/m
3
, Total dust
5 mg/m
3
, Respirable
ACGIH Threshold Limit: 10 mg/ m
3
, Treated as nuisance dust
Silica, crystalline (Quartz) CAS RN 14808-60-7 may be present in small quantities:
OSHA Permissible Exposure Limits-Time Weighted Average
30 mg/m
3
/(%SiO
2
+2) Total
10 mg/m
3
/(%SiO
2
+2) Respirable
ACGIH Threshold Limit: 0.025mg/ m
3
Engineering Controls: Ventilation should prevent airborne accumulation of dust and comply with
maximum exposure limits. Equipment, if present, should be grounded.
Respirator Protection: NIOSH-approved dust mask recommended if excess carbon dust is generated.
Eye Protection: Safety goggles with side shield recommended. Provide eyewash stations nearby.
Skin: Wear suitable gloves, long sleeves, and pants. Wash thoroughly with soap and water after
handling. Change into clean apparel before leaving the workplace. Wash apparel daily.
RCRA Status: If discarded in its purchased form, this product is not a hazardous waste, either by listing
or by characteristic. However, under RCRA, it is the responsibility of the product user to determine at
the time of disposal whether a material containing the product or derived from the product should be
classified as a hazardous waste (40 CFR 261.10).
9. Physical and Chemical Properties
Appearance – Black powder solid, fine dust, 90% or more passing 325 mesh, free-flowing.
Upper/lower explosive limits No information available
Odor – Odorless, or slight sulfur smell.
Combustible dust- Watercarb is a combustible dust. May form combustible dust concentrations in air.
All powdered activated carbons are weakly explosive. No specific information on Watercarb is available.
Typical combustible dust data for a variety of activated carbons:
K
st
values reported between 43-113 (various sources).
Dust explosion class St1 (K
st
values < 200 are Class St1-weakly explosive).
MEC (minimum explosible concentration) in air 50 and 60 g/m
3
(two reports)
Volatile content (by weight): < 8% ASTM D3175-11 (Watercarb)
MIT (minimum ignition temperature) values reported between 400-680°C (752-1256°F)
(four reports)
Maximum Absolute Explosion pressure values reported between 6.0-8.6 bar (four
reports)
Vapor pressure Not applicable
Odor threshold Not applicable
Vapor density Not applicable
pH –pH of Watercarb in solution varies between 7-10.
Relative density Not applicable
Apparent Density – 0.4 to 0.6 g/cc, typically 0.45 g/cc