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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
A-28
SECTION IX. SPECIAL PRECAUTIONS
PRECAUTIONS TO BE TAKEN IN HANDLING AND STORING
General cleanliness should be followed.
The Toxicology data indicate that ceramic fiber should be handled with
caution. The handling practices described in this MSDS must be strictly
followed. In particular, when handling refractory ceramic fiber in any
application, special caution should be taken to avoid unnecessary
cutting and tearing of the material to minimize generation of airborne
dust.
It is recommended that full body clothing be worn to reduce the potential
for skin irritation. Washable or disposable clothing may be used. Do not
take unwashed work clothing home. Work clothes should be washed
separately from other clothing. Rinse washing machine thoroughly after
use. If clothing is to be laundered by someone else, inform launderer of
proper procedure. Work clothes and street clothes should be kept
separate to prevent contamination.
Product which has been in service at elevated temperatures (greater
than 1800°F/982°C) may undergo partial conversion to cristobalite, a
form of crystalline silica. This reaction occurs at the furnace lining hot
face. As a consequence, this material becomes more friable; special
caution must be taken to minimize generation of air-borne dust. The
amount of cristobalite present will depend on the temperature and
length in service.
IARC has recently reviewed the animal, human, and other relevant
experimental data on silica in order to critically evaluate and classify the
cancer causing potential. Based on its review, IARC classified
crystalline silica as a group 2A carcinogen (probable human
carcinogen).
The OSHA permissible exposure limit (PEL for cristobalite is 0.05
mg/m3 (respirable dust). The ACGIH threshold limit value (TLV) for
cristobalite is 0.05 mg/m3 (respirable dust) (ACGIH 1991-92). Use
NIOSH or MSHA approved equipment when airborne exposure limits
may be exceeded. The minimum respiratory protection recommended
for given airborne fiber or cristobalite concentrations are:
CONCENTRATION
Concentration Personal Protective Equipment
0-1 fiber/cc or 0-0.05 mg/m
3
cristobalite (the OSHA PEL)
Optional disposable dust respirator (e.g.
3M 9970 or equivalent).
Up to 5 fibers/cc or up to 10 times the
OSHA PEL for cristobalite
Half face, air purifying respirator
equipped with high efficiency particulate
air (HEPA) filter cartridges (e.g. 3M 6000
series with 2040 filter or equivalent).
Up to 25 fibers/cc or 50 times the
OSHA PEL for cristobalite (2.5
mg/m
3
)
Full face, air purifying respirator with
high efficiency particulate air (HEPA)
filter cartridges (e.g. 3M 7800S with
7255 filters or equivalent) or powered air
purifying respirator (PARR) equipped
with HEPA filter cartridges (e.g. 3M
W3265S with W3267 filters or
equivalent).
Greater than 25 fibers/cc or 50 times
the OSHA PEL for cristobalite (2.5
mg/m
3
)
Full face, positive pressure supplied air
respirator (e.g. 3M 7800S with W9435
hose & W3196 low pressure regulator kit
connected to clean air supply or
equivalent).