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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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Preparation, certification and interlaboratory analysis of workplace air filters spiked with high-fired beryllium oxide. by Thomas J Oatts, Cheryl E Hicks, Amy R Adams, Michael J Brisson, Linda D Youmans-McDonald, Mark D Hoover, Kevin Ashley. Journal of environmental monitoring : JEM. Read more related scholarly scientific articles and abstracts.
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tory materials such as high-fired beryllium oxide, agitation of the dissolution solution with the media must be replaced by heating to 80 °C for 30 minutes. Any standard dissolution process is particle-size dependent. The two sources of BeO used to validate the method are described in the backup data report [6]. 6.
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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. ... [Studies on the effects of beryllium oxide in purity and fired temperature to the occurrence of chronic pulmonary berylliosis] Sangyo Igaku. 1983 Mar;25(2):91-105. doi: 10.1539/joh1959 ...
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In this work, performance data on the extraction of beryllium from various size fractions of high-fired beryllium oxide (BeO) particles (from . 32 microm up to 212 microm) using dilute aqueous ammonium bifluoride (ABF) solution were obtained under various conditions. Beryllium concentrations were determined by fluorescence using a ...
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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 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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3.2.4 powder lot—that quantity of beryllium-oxide powder processed such that samples taken in accordance with the procedures of Section 8 can be considered as representative of the entire powder lot. 3.2.5 seller—beryllium oxide powder supplier. 4. Ordering Information 4.1 The beryllium oxide powder must meet the chemical
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Beryllium Oxide is second only to Diamond among insulating materials. BeO has a low Dielectric constant (6.76) and a low dielectric loss tangent, permitting improved circuit performance at high frequencies. Beryllium Oxide has a Coefficient of Thermal Expansion (CTE) of 9.0 which is intermediate compared to silicon or gallium arsenide and metals.
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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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Worker exposures to beryllium can occur in settings such as foundry and smelting operations; fabricating, machining, and grinding beryllium metal and alloys; beryllium oxide ceramics …
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Beryllium Oxide (BeO), which is commonly referred to as Beryllia, is endowed with a virtuously unique combination of thermal, electrical, optical, and mechanical properties which may be exploited for a diverse range of applications from thermal management systems for integrated electronics to high temperature high perform…
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This material comes As-Fired .005" – .080" thick, and then is lapped and/or polished by Valley Design into any custom thickness specified. ... Beryllium Oxide substrates are being chosen less and less frequently in favor of non toxic AlN. Aluminum Nitride substrates can be used wherever thermo-mechanical or power dissipation properties ...
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Preparation, certification and interlaboratory analysis of workplace air filters spiked with high-fired beryllium oxide
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It reacts briefly with oxygen in the air to form beryllium oxide (BeO). The beryllium oxide forms a thin skin on the surface of the metal that prevents the metal from reacting further with oxygen. ... Radioactive isotopes are produced when very small particles are fired at atoms. These particles stick in the atoms and make them radioactive ...
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BERYLLIUM OXIDE Los Alamos Technical Series, Metallurgy, ... This was the Brush Beryllium Company's "GC High Fired" grade. Pressing at 1700°C for five minutes at 1000 psi resulted in a density of 2. 85 gm/cc. The maximum density obtained during the entire investi-
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BeO is carcinogenic in powdered form and may cause a chronic allergic-type lung disease berylliosis. Once fired into solid form, it is safe to handle if not subjected to machining that generates dust. Clean breakage releases little dust, but …
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materials such as high-fired beryllium oxide, agitation of the dissolution solution with the media must be replaced by heating to 85 °C for 60 minutes or more. Any standard dissolution …
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Beryllium oxide formed at high temperatures (>800 °C) is inert, but easily dissolves in hot aqueous ammonium bifluoride (NH4HF2) or a hot concentrated sulfuric acid ... Once fired into solid form, it is safe to handle if not subjected to machining that generates dust. Clean breakage releases little dust, but crushing or grinding actions can ...
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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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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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Notes. Beryllium is a specialty high temperature fluxing oxide available as a pure material in a wide variety of sizes and shapes. It acts as a refractory alone. It can also be used as a modifier and opacifier at lower temperatures. It is manufactured from Beryl, an igneous mineral silicate of beryllium and aluminum containing about 12-14% beryllium.
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Special Hazards of Combustion Products: Toxic beryllium oxide fume may form in fire. (USCG, 1999)
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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 …
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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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Thin Film Circuits. SemiGen offers build-to-print services for a wide range of materials and metallization schemes. We use our processing technology to fabricate circuits on As-Fired Alumina, Polished Alumina, Superstrate TPS, Aluminum Nitride, Beryllium Oxide, Fused Silica/Quartz, Sapphire, and Hi-K Dielectrics.
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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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Beryllium Oxide is a white colored, crystalline, inorganic compound that emits toxic fumes of beryllium oxides upon heating. Beryllium oxide is widely used in industry due to its low density and high thermal and …
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When mixtures obtained by the method from prefired highly-dispersed beryllium oxide are fired, a cellular framwork is formed with spherical pores contained within the sintered shell.Parts made of BeO by the method show great strength and high refractoriness-under-load.Parts with a combustible additive base show low strength and a low softening point. But the …
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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 measurement of high-fired BeO is required.
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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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