[PDF] Evaluation of High-Fired Beryllium Oxide Digestion …

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 characterization in soils by selective extraction

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 proposed method involves the addition of 9 mL of an aqueous solution of 5% (wt/vol) ammonium bifluoride (ABF) to a 10-mL tube with 250 mg of dried ...

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Beryllium oxide purum

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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산화 베릴륨

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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Preparation, certification and interlaboratory analysis …

Preparation, certification and interlaboratory analysis of workplace air filters spiked with high-fired beryllium oxide ... as in the case of beryllium in the form of beryllium oxide (BeO). An interlaboratory study was performed to collect …

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Beryllium

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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Applications and Uses of Beryllium Oxide (BeO)

Beryllium oxide ceramics are also used in the medical industry to enhance health equipment, such as medical lasers and diagnostic imaging equipment. The non-toxic properties of BeO in ceramic application and wear endurance make the product highly suitable for use in lightless and very selective areas.

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Beryllium Oxide

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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Semiconductor Components | Packaging | By Material

Alumina - High Temperature Co-fired Ceramic (HTCC) Alumina (Al2O3) has been utilized in the electronic industry since the 1940s and features several important physical and electrical characteristics that make it a prime candidate for high-reliability applications: ... Beryllium Oxide (BeO) ceramic is an electronic packaging material well-suited ...

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BERYLLIUM OXIDE | CAMEO Chemicals | NOAA

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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Genotoxicity and Carcinogenicity

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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Beryllium Oxide (BeO) Ceramic PCB

Beryllium Oxide (BeO) Ceramic PCB Beryllium oxide (BeO) ceramics, commonly known as beryllia ceramics, are a type of ceramic composed predominantly of exceptionally pure beryllium oxide, constituting up to 99% of its composition. ... HTCC (High-Temperature Co-Fired Ceramic) HTCC differs from LTCC in baking temperature, as HTCC undergoes baking ...

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Thermal Conductivity of Beryllium Oxide From 40° to 750° C

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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Evaluation of High-Strength, High-Modulus Beryllium Oxide/Glass …

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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Toxicology of high-fired beryllium oxide inhaled by rodents. II

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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Evaluation of High-Fired Beryllium Oxide Digestion Methods to …

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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Beryllium Oxide

Beryllium Oxide is a type of radiation dosimeter that competes with LiF:Mg, Ti in sensitivity and is commonly used as a thermally stimulated exoelectron emission (TSEE) dosimeter. ... cells and found that the genotoxicity of beryllium oxides is influenced by the temperature at which the oxides are fired. To examine this in vitro, primary rat ...

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BERYLLIUM OXIDE BEO

3.9 Chronic Toxicity: Beryllium disease may occur in lymph nodes, liver, spleen, kidney, etc. as well as lung. 3.10 Vapor (Gas) Irritant Characteristics: Currently not available 3.11 Liquid or Solid Characteristics: Currently not available 3.12 Odor Threshold: Odorless 3.13 IDLH Value: 4 mg/m3 as beryllium. 3.14 OSHA PEL-TWA: 0.002 mg/m3 as ...

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Beryllium Oxide Safety

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 …

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BERYLLIUM AND BERYLLIUM COMPOUNDS (CICAD 32, 2001)

Low-fired beryllium oxide is predominantly made up of poorly crystallized small particles, which are more soluble and reactive, whereas higher firing temperatures result in less reactivity due to increasing crystal size. Although the solubility of the low-fired crystals is 10 times that of the high-fired crystals, it should be pointed out that ...

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Beryllium Oxide Design Guide

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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Toxicology of High-Fired Beryllium Oxide Inhaled by Rodents

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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Beryllium Oxide Suppliers

Beryllium Oxide (BeO) Ceramic Heat Sinks, Crucibles, Washers, Thermocouple Tubing, & Custom-Made Substrates For Extremely High Thermal Conductivity Of 265 W/M-Degrees-K & Allow For Efficient Removal Of Heat From Critical Areas. ... Substrates Can Be Dry Pressed With A Minimal "As Fired" Surface Finish Of 20 Micro-Inches & Lapped & Polished To …

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4 Genotoxicity and Carcinogenicity | Health Effects of Beryllium

Litvinov et al. (1984) exposed albino rats to beryllium oxide or beryllium chloride at 0.8, 4, ... Pulmonary neoplasms developed in inbred albino rats that were given single intratracheal deposits of beryllium oxide (fired at high and low temperatures) at 0.036, 0.36, 3.6, or 18 mg/kg (Litvinov et al. 1983). The neoplasms were adenomas ...

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Sample dissolution reagents for beryllium

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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Beryllium and Compounds (as Be)

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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Beryllium Laboratory Analysis

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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Beryllium

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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Beryllium Hazard: An Overview on Regulation …

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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[Studies on the effects of beryllium oxide in purity and fired

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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