Today, practically all of the beryllium oxide produced commercially is calcined at temperatures of 1000 °C or higher and is referred to as 'high-fired'. Beryllium oxide that is calcined at temperatures lower than 1000 °C is referred to as 'low-fired' it consists of poorly crystallized, small particles which are more reactive and more ...
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Surface area of respirable beryllium metal, oxide, and copper alloy aerosols and implications for assessment of exposure risk of chronic beryllium disease. Aleksandr B Stefaniak et al. AIHA journal : a journal for the science of occupational and environmental health and safety, 64(3), 297-305 ()
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According to OSHA, workers who have been exposed to beryllium can be at an increased risk of developing chronic beryllium disease (CBD), berylliosis and lung cancer. OSHA states that the final rule changes are meant …
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Wistar rats received intratracheal instillations of 1 mg of beryllium oxide (low-fired) once a week for 15 weeks (Ishinishi et al. 1980). An adenocarcinoma, a squamous-cell carcinoma, and four adenomas were observed in the lungs of 30 beryllium-treated rats and no …
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rod of high-fired beryllium oxide, surrounded by a tube lI·ith matching temperature gradient to minimize radial heat loss. The estimated accurncy of the measurements is about 3 percent. However, the values of thermal conductivity of the ideal beryllium oxid e crystal arc probably
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Toxicology of high-fired beryllium oxide inhaled by rodents. II. Metabolism and early effects Arch Environ Health. 1975 Nov;30(11):546-51. doi: 10.1080/00039896.1975.10666773. Authors C L Sanders, W C Cannon, G J Powers, R R Adee, D M Meier. PMID: 1217915 DOI: 10.1080 ...
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Beryllium Oxide(BeO) is a well-known prototype refractory oxide with a wide range of applications ranging from optoelectronic devices to nuclear reactors. Since BeO is a wide-band gapoxide crystal, its application as an ultraviolet …
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Beryllium Oxide Safety. Solid monolithic forms of fired Beryllium Oxide ceramic components will not present any meaningful health risks. If the safe handling practices, which have been recommended by those who manufacture Beryllium-based products, are adhered to with the necessary degree of rigor, these material components will essentially pose no health risk.
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High fired (1450 o C) beryllium oxide (BeO) also known as Beryllia is a ceramic material that has unique electrical and thermal conductivity properties making it useful in electronic devices. …
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High fired BeO is an extremely insoluble, refractory compound that may be present at some DOE sites. Because of the toxicity of air-borne BeO particulates, detection and …
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Several digestion methods were tested to determine their effectiveness on high-fired BeO (ceramic BeO that has been heated to a temperature of approximately 1450 degrees C). High fired BeO is an extremely insoluble, refractory compound that may be present at some DOE sites. Because of the toxicity of air-borne BeO particulates, detection and measurement of high …
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Beryllium Oxide. Beryllium oxide (BeO) is a white crystalline oxide. It occurs in nature as the mineral "Bromellite". ... Boiler (oil-fired) additives: Raises melting point of ash generated to produce a friable material that is easily removed; reduced corrosion of steel pipes holding steam as well as sulfur emissions into the environment:
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Request PDF | Toxicology of High-Fired Beryllium Oxide Inhaled by Rodents | • Several groups of male and rats and hamsters were exposed by inhalation to an aerosol of BeO particles ...
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The results demonstrate the important function of the alveolar macrophage in Be-induced granulomatous disease, as well as the rapid impairment of alveolars macrophages function by phagocytized BeO. Several groups of male and rats and hamsters were exposed by inhalation to an aerosol of BeO particles calcined at 1000 C. Initial alveolar depositions ranged …
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San Jose Delta maintains an extensive in-house inventory of certified Materion beryllia ceramic machining stock, including BW-1000, a higher strength and finer grain berylia,. While the grinding of beryllium oxide requires stringent dust control during the grinding process (see health and safety below) it otherwise machines like other technical ceramics of the similar density and […]
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Special Hazards of Combustion Products: Toxic beryllium oxide fume may form in fire. (USCG, 1999) Any dramatic, unexplained weight loss should be considered as possible first indication …
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산화 베릴륨은 알칼리 토금속의 산화물 중에서는 유일하게 공유 결합 물질로 간주된다. 이는 베릴륨의 원자 크기가 다른 2족 원소에 비해 상대적으로 작은 것에 기인한다. 같은 이유로 산화 베릴륨은 양쪽성 물질이다. 물이나 질산에는 녹지않지만, 진한 …
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The method is based on the premise that if high-fired beryllium oxide can be extracted efficiently, then beryllium metal and acid-soluble beryllium salts would also be extracted efficiently. The ...
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MADE OF BERYLLIUM OXIDE I.YA.GUZMAN AND D.N. POLUBOYNARINOV (Mendeleyev Chemical-Technological Institute) Inasmuch as it possess high refractoriness, chemical ... fired in corundura capsules at 750oc for 2 hours. The properties of the porous refractories -- thermal conductivity, strength, gas permeability and so on -- are ...
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Among various beryllium (Be) compounds, beryllium oxide (BeO) has so far been noted as a causative substance which introduce chronic pulmonary berylliosis. In our study, chronic …
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The major anthropogenic emission source to the environment is the combustion of coal and fuel oil, which releases particulates and fly ash that contain beryllium into the atmosphere ().Other anthropogenic processes, such as ore processing, metal fabrication, beryllium oxide production and use, and municipal waste combustion, release only a fraction of the amounts emitted from …
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As-fired flatness is typically 0.004" /''. Tighter tolerances are achievable, but are obtained with additional machining processes resulting in increased costs. HEALTH & SAFETY NOTE Handling beryllium oxide ceramics in solid form poses no special health risk. Like many industrial materials, beryllium-containing materials may pose a health
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compounds vary. The major forms of beryllium encountered industrially are: beryllium metal, beryllium alloys (mainly aluminum or copper), and beryllium compounds (beryllium fluoride, beryllium hydroxide, and beryllium oxide). Beryllium Synonyms: elemental beryllium (Be); glucinum (Gl) Solubility: insoluble in water . IMIS number. 8: 0360
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The inhalation toxicity of insoluble beryllium oxide depends on its physical and chemical properties. Because the ultimate particle size and the aggregates formed are smaller, "low-fired" (500-750 °C) beryllium oxides are toxic, whereas "high-fired" (> 1000 °C) beryllium oxides appear to be relatively inert.
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Beryllium is a lightweight but extremely strong metal used in the aerospace, electronics, energy, telecommunications, medical, and defense industries. Beryllium-copper alloys are widely used because of their electrical and thermal conductivity, hardness, and good corrosion resistance.
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Beryllium is Easy to Detect Using the Be Finder® Method. Be Finder® is a method for detecting particulates of beryllium and its compounds by optical fluorescence. This methodology does not require expensive set-up and can yield results within an hour. The method entails wiping the surface suspected of having beryllium contamination with a ...
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Laboratory analysis for beryllium samples has always presented a challenge to the analytical community. While most metals of interest to industrial hygienists have occupational exposure limits (OELs) in milligrams per cubic meter (mg/m …
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Bertrandite (<1% beryllium) is the principal mineral mined for beryllium in the U.S. while beryl (4% beryllium) is the principal mineral mined for beryllium in the rest of the world. Beryllium is used industrially in three forms: as a pure metal, as beryllium oxide, and most commonly, as an alloy with copper, aluminum, magnesium, or nickel.
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A high-strength, high-modulus S-glass fiber containing beryllium oxide was evaluated for mechanical properties, with the standard commercial S-glass as the control. In a 30-day continuous run, over 500 lb of good-quality fiber was made from a production bushing of 204 holes. We examined the fiber strength of several forms: 1) filaments; 2) sized filaments …
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The thermal expansion of the electrically fused beryllium oxide and of bars of the oxide fired at lower temperatures is also very close. The electrical conductivity is higher than that for magnesia and alumina. The thermal conductivity appears to be …
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