Safety appliances

Potassium ferf-butoxide was supplied by Mine Safety Appliances (MSA) Research Corporation. 

Round Robin No 30 of the ICRPG Working Group on Analytical Chemistry Particle Size Analysis of Nominal 20- to 30-Micron Ammonium Perchlorate with the Mine Safety Appliances Analyzer", RK-TR-69-13 (1969) 40) R.A. Dobbins L.D. Strand, AIAA Joum 8, 1544 (1970) 41) R.W. Hutchinson, Use of... 

Potassium 2-but oxide was obtained from Mine Safety Appliances Corp. 

Two examples of air purifying respirators are the MSA Ultra-Twin full-face respirator (Mine Safety Appliances Company [MSA], Pittsburgh, PA), and the 3M Model 6800 full-face mask (3M, St. Paul, MN). Figure 6.7 shows an air-purifying respirator. 

Commercial potassium I-butoxide is used directly as obtained from the Mine Safety Appliance Research Corp., Gallery, Pennsylvania. 

CO (Mine Safety Appliances Co LIRA (Pasadena) and Bendix Model 8501-SCA (Los Angeles))... 

Material Safety Data Sheet, Callery Chemical Company, Division of Mine Safety Appliances Company, P.O. Box 429, Pittsburg, PA 15230. 

Diborane(6), B2H6. This spontaneously flammable gas is consumed primarily by the dectronics industry as a dopant in the production of silicon wafers for use in semiconductors. It is also used to produce amine boranes and the higher boron hydrides. Callery Chemical Co., a division of Mine Safety Appliances Co., and Voltaix, Inc., are the main U.S. producers of this substance. Several hundred thousand pounds were manufactured worldwide in 1990. 

Mine Safety Appliances Company, USA (MSA) developed a reduction process using sodium and KC1 to produce potassium metal in the 1950s (4) ... 

Total U.S. production of potassium metal is less than 500 t/yr. There are few commercial producers worldwide, although some companies produce potassium captively. The more prominent producers are Callery Chemical Company (a division of Mine Safety Appliances Company) in the United States and the People s Republic of China. Potassium may be manufactured in Russia as well. Strem Chemicals (U.S.) supplies small quantities in ampuls. 

Mine Safety Appliances Co. (MSA) manufactures potassium superoxide in the United States for use in self-contained breathing equipment. There are several published uses for potassium superoxide in organic chemistry, e.g., for oxidizing aromatic compounds and for initiating anionic polymerization. 

Sodium peroxide of especially large surface area and high purity should be used. This can be obtained from the Mine Safety Appliances Company, Pittsburgh, Pa. 

Figure 2. Respiratory protective equipment. One-piece positive pressure ventilated suits. Mine Safety Appliances Company...

The checker used a commercial 56% Na/K alloy obtained from Mine Safety Appliance, Evans City, Pa. 16033. The alloy is supplied in 60-ml ampuls which were added directly to the autoclave. This avoids the hazardous syringe transfer of the alloy. 

An apparatus utilising the reaction between carbon monoxide and iodic acid has been produced by the Mines Safety Appliances. This permits the determination of the amount of carbon monoxide in air in a few seconds with sufficient accuracy for practical purposes. A measured volume of gas is passed first through a... 

Hopcalite, manufactured by the Mine Safety Appliances Co., has been found to be an excellent catalyst for this purpose it is a mixture of sintered metallic oxides. In a preliminary series of experiments, the catalyst qualitatively decomposed 90 p.p.m. of ozone in an air stream, and its activity remained unchanged after 100 hours of operation, when the experiment was discontinued. 

Carbon Monoxide. It was found that 20 p.p.m. of carbon monoxide do not interfere with the operation or sensitivity of the analyzer. This result is surprising, because the catalyst used in this study (Hopcalite) is also used to detect carbon monoxide in a device manufactured by the Mine Safety Appliances Co. However, the catalyst must be carefully dried prior to use in order to decompose any carbon monoxide present. The inertness of the ozone detector to carbon monoxide in these experiments may be attributed to the poisoning of the catalyst by the water vapor normally present in the atmosphere. 

The pulmonary diffusion coefficient was determined by the carbon monoxide method of Krogh 5, 11). Deviating from the original method, a much smaller concentration of carbon monoxide was used, 0.004% instead of 1.0%. This made it possible, after further dilution, to determine the carbon monoxide concentration by means of indicator tubes (Mine Safety Appliances Co.), the color of which was compared with calibrated standards (4 21). 

MSA (Mine Safety Appliance) Research Corp., Callery, Pa. 

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