Fiberglass Hazards fiberglass insulation particles in air
These fibers are classified into three general groups fiberglass (glass wool and glass filament) mineral wool (rock wool and slag wool) and refractory ceramic fibers (RCF). There are more than 225 000 workers in the US exposed to synthetic mineral fibers in manufacturing and end-use applications.
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Health Hazard Assessment of Nonasbestos Fibers Final Draft
Smith et al. (1986) also studied the long-term health effects of refractory ceramic fibers in rats and hamsters. Male Syrian hamsters and Osborne-Mendel rats were exposed "nose-only" to dust cloud of refractory ceramic fibers at a mass concentration of 12 mg/m3 (equivalent to 200 fibers
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KETSU / Valmiita perustelumuistioita
Mortality of workers occupationally exposed to refractory ceramic fibers. J Occup Environ Med 45 (4) . Lippmann M. (1990a). "Effects of fiber characteristics on lung deposition retention and disease." Environ Health Perspect 88 311-7. Lippmann M. (1990b). "Man-made mineral fibers (MMMF) human exposures and health risk assessment."
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Refractory Ceramic Fibre MaterialNERSHCO
durable fiber15. NIOSH therefore recommends substituting a less durable fiber for RCF s in order to reduce the hazard for exposed workers 6. Alkaline earth silicate wools are less biopersistent fibers and designed by several RCF producers within the Refractory Ceramic Fibers Coalition (RCFC) which must first undergo industry-
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KETSU / Valmiita perustelumuistioita
Mortality of workers occupationally exposed to refractory ceramic fibers. J Occup Environ Med 45 (4) . Lippmann M. (1990a). "Effects of fiber characteristics on lung deposition retention and disease." Environ Health Perspect 88 311-7. Lippmann M. (1990b). "Man-made mineral fibers (MMMF) human exposures and health risk assessment."
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Carbon nanotubeWikipedia
Structure of single-walled tubes . The structure of an ideal (infinitely long) single-walled carbon nanotube is that of a regular hexagonal lattice drawn on an infinite cylindrical surface whose vertices are the positions of the carbon atoms. Since the length of the carbon-carbon bonds is fairly fixed there are constraints on the diameter of the cylinder and the arrangement of the atoms on it.
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Analysis of Fiber Release from Certain Asbestos Products
The fiber concentrations reported were determined by che NIOSH method i.e. fibers as long or longer than 5 urn with as aspect ratio of -J to 1 or greater were counted by phase contrast analysis using optical light microscopy. Installation of vinyl-asbestos floor tiles results in minimal fiber release.
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Potential Pulmonary Effects of Man-Made Organic Fiber
The numbers of segmented fibers increased over time in the lung.As a basis of comparison the authors cite another study in which rats exposed to refractory ceramic fiber (RCF1) at 200 WHO f/ml for 90 days developed minimal lung fibrosis (lung scarring characterized by excessive interstitial collagen deposition considered to be irreversible
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Crystalline silica in heated man-made vitreous fibres A
Feb 01 2014 · Refractory ceramic fibres (RCF) and alkaline earth silicate (AES) wools are types of man-made vitreous fibre (MMVF) that are used in demanding high-temperature industrial applications generally above 900 °C and up to 1400 °C.
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Fiberglass Hazards fiberglass insulation particles in air
These fibers are classified into three general groups fiberglass (glass wool and glass filament) mineral wool (rock wool and slag wool) and refractory ceramic fibers (RCF). There are more than 225 000 workers in the US exposed to synthetic mineral fibers in manufacturing and end-use applications.
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KM 364e
evidence in humans) continues to be the appropriate classification for refractory ceramic fiber (RCF). The Seventh Annual Report on Carcinogens (1994) prepared by the National Toxicology Program (NTP) classified respirable RCF and glasswool as substances reasonably anticipated to be carcinogens.
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eLCOSH NIOSH Construction Compendium
One-page summaries of over 100 NIOSH-supported construction safety and health research projects in 2002. and other fibers such as refractory ceramic fibers are still being used commercially. has resulted in a new type of fiber length classifier that helps to analyze the in vitro toxicity of fibers as a function of fiber length
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Man-Made Mineral Fibers and the Respiratory Tract
Dec 01 2012 · Refractory ceramic fibers are a mix of aluminum silica and other refractory oxides. Their fibers have a diameter of 1.2–3.5 μm and their longitude is variable. They began to be commercialized between 1950 and 1960 and they are relatively new compared with other MMMF.
Get Price29 CFR § 1910.1001Asbestos. CFR US Law LII
(a) Scope and application. (1) This section applies to all occupational exposures to asbestos in all industries covered by the Occupational Safety and Health Act except as provided in paragraph (a)(2) and (3) of this section. (2) This section does not apply to construction work as defined in 29 CFR 1910.12(b). (Exposure to asbestos in construction work is covered by 29 CFR 1926.1101).
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Potential Pulmonary Effects of Man-Made Organic Fiber
The numbers of segmented fibers increased over time in the lung.As a basis of comparison the authors cite another study in which rats exposed to refractory ceramic fiber (RCF1) at 200 WHO f/ml for 90 days developed minimal lung fibrosis (lung scarring characterized by excessive interstitial collagen deposition considered to be irreversible
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Occupational Exposure to Refractory Ceramic Fibers NIOSH
Jun 06 2014 · This criteria document is derived from reviews of information from human and animal studies of the toxicity of refractory ceramic fibers (RCFs) and is intended to describe the potential health effects of occupational exposure to airborne fibers of this material.
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KM 364e
evidence in humans) continues to be the appropriate classification for refractory ceramic fiber (RCF). The Seventh Annual Report on Carcinogens (1994) prepared by the National Toxicology Program (NTP) classified respirable RCF and glasswool as substances reasonably anticipated to be carcinogens.
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1910.1001 App JPolarized Light Microscopy of Asbestos
Compared to cleavage fragments of the same minerals asbestiform fibers possess a high tensile strength along the fiber axis. They are chemically inert non-combustible and heat resistant. Except for chrysotile they are insoluble in Hydrochloric acid (HCl). Chrysotile is slightly soluble in HCl.
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Mineral woolWikipedia
Alumino silicate wool also known as refractory ceramic fibre (RCF) consists of amorphous fibres produced by melting a combination of aluminum oxide (Al 2 O 3) and silicon dioxide (SiO 2) usually in a weight ratio 50 50 (see also VDI 3469 Parts 1 and 5 as well as TRGS 521).
Get PriceEmerging Research and Research IssuesRespiratory
NIOSH has also contributed to our understanding of possible pulmonary consequences arising from refractory ceramic fibers (RCFs). Monitoring of exposure and control technology research has led to a product stewardship program which RDRP scientists continue to monitor.
Get PriceAnalysis of Fiber Release from Certain Asbestos Products
The fiber concentrations reported were determined by che NIOSH method i.e. fibers as long or longer than 5 urn with as aspect ratio of -J to 1 or greater were counted by phase contrast analysis using optical light microscopy. Installation of vinyl-asbestos floor tiles results in minimal fiber release.
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Carbon nanotubeWikipedia
Structure of single-walled tubes . The structure of an ideal (infinitely long) single-walled carbon nanotube is that of a regular hexagonal lattice drawn on an infinite cylindrical surface whose vertices are the positions of the carbon atoms. Since the length of the carbon-carbon bonds is fairly fixed there are constraints on the diameter of the cylinder and the arrangement of the atoms on it.
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MATERIAL SAFETY DATA SHEET Grades 550 LF LJ Date
Ceramic fiber 88100 0.5 fiber/cc recommended exposure guideline 1 fiber/cc OSHA Proposed Std. 5 mg/cu. m. OSHA respirable dust. 15 mg/cu. m. OSHA Total dust. 0.2 fiber/cc (TLV) ACGIH for Refractory ceramic fiber (RCF)(respirable particulate). Crystalline silica (cristobalite) will form after this product
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Analysis of Fiber Release from Certain Asbestos Products
The fiber concentrations reported were determined by che NIOSH method i.e. fibers as long or longer than 5 urn with as aspect ratio of -J to 1 or greater were counted by phase contrast analysis using optical light microscopy. Installation of vinyl-asbestos floor tiles results in minimal fiber release.
Get PriceZRCI SDS-0024ZIRCAR Refractory Composites Inc. High
Components OSHA PEL NIOSH REL ACGIH TLV MANUFACTURER Refractory Ceramic Fiber (RCF) None established 0.5 f/cc 8-hr. TWA 0.2 f/cc TLV 8-hr. TWA 0.5 f/cc 8-hr. TWA COMPONENT OSHA PEL ACGIH TLV MANUFACTURER Aluminum Oxide 5 mg/m3 (Respirable Fraction) 15 mg/m3 (Total Dust) 1 mg/m3 (respirable fraction) None Established None established
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Occupational Exposure to Asbestos Occupational Safety
Aug 10 1994 · NIOSH too testified that " i n NIOSH s judgment the establishment of a PEL or an action level below 0.1 fiber per cc for most industrial or construction work sites would be
Get PriceMan-Made Mineral Fibers and the Respiratory Tract
Dec 01 2012 · Refractory ceramic fibers are a mix of aluminum silica and other refractory oxides. Their fibers have a diameter of 1.2–3.5 μm and their longitude is variable. They began to be commercialized between 1950 and 1960 and they are relatively new compared with other MMMF.
Get PriceRespiratory Diseases Research at NIOSH Reviews of
NIOSH has also contributed to our understanding of possible pulmonary con- sequences arising from refractory ceramic fibers (RCFs). Monitoring of exposure and control technology research has led to a product stewardship program which RDRP scientists continue to monitor.
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Mineral woolWikipedia
Alumino silicate wool also known as refractory ceramic fibre (RCF) consists of amorphous fibres produced by melting a combination of aluminum oxide (Al 2 O 3) and silicon dioxide (SiO 2) usually in a weight ratio 50 50 (see also VDI 3469 Parts 1 and 5 as well as TRGS 521).
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