IARC’s evaluation of crystalline silica states “Crystalline silica inhaled in the form of quartz or
cristobalite from occupational sources is carcinogenic to humans (Group 1)” and additionally
notes “carcinogenicity in humans was not detected in all industrial circum
Monograph Vol. 68, 1997). NTP lists all polymorphs of crystalline silica amongst substances
which may "reasonably be anticipated to be carcinogens".
IARC and NTP did not evaluate after-service RCF, which may contain various crystalline phases.
However, an analysis of after-service RCF samples obtained pursuant to an exposure monitoring
agreement with the USEPA, found that in the furnace conditions sampled, most did not contain
detectable levels of crystalline silica. Other relevant RCF studies found that (1) simulated after-
service RCF showed little, or no, activity where exposure was by inhalation or by intraperitoneal
injection; and (2) after-service RCF was not cytotoxic to macrophage-like cells at concentrations
up to 320 g/cm
²
- by comparison, pure quartz or cristobalite were significantly active at much
lower levels (circa 20 g/cm
²
).
RCF AFTER-SERVICE REMOVAL
Respiratory protection should be provided in compliance with OSHA standards. During removal
operations, a full face respirator is recommended to reduce inhalation exposure along with eye
and respiratory tract irritation. A specific evaluation of workplace hazards and the identification of
appropriate respiratory protection is best performed, on a case by case basis, by a qualified
industrial hygiene professional.
PRODUCT STEWARDSHIP PROGRAM
The Unifrax Corporation has established a program to provide customers with up-to-date
information regarding the proper use and handling of refractory ceramic fiber. In addition, Unifrax
Corporation has also established a program to monitor airborne fiber concentrations at customer
facilities. If you would like more information about this program, please call the Unifrax
Corporation Product Stewardship Information Hotline at 1-800-322-2293.
On February 11, 2002, the Refractory Ceramic Fibers Coalition (RCFC) and the U.S.
Occupational Safety and Health Administration (OSHA) introduced a voluntary worker protection
program entitled PSP 2002, a comprehensive, multi-faceted risk management program designed
to control and reduce workplace exposures to refractory ceramic fiber (RCF). Unifrax Corporation,
as a member of RCFC, is participating in this highly acclaimed product stewardship program. For
more information regarding PSP 2002, please call the Unifrax Corporation's Product Stewardship
Information Hotline at 1-800-322-2293 or refer to the RCFC web site:
http://www.rcfc.net
.
DEFINITIONS
ACGIH:
American Conference of Governmental Industrial Hygienists
ADR:
Carriage of Dangerous Goods by Road (International Regulation)
CAA:
Clean Air Act
CAS:
Chemical Abstracts Service
CERCLA:
Comprehensive Environmental Response, Compensation and
Liability Act
DSL:
Domestic Substances List
EPA:
Environmental Protection Agency
EU:
European Union
f/cc:
Fibers per cubic centimeter
HEPA:
High Efficiency Particulate Air
HMIS:
Hazardous Materials Identification System
IARC:
International Agency for Research on Cancer
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