This spark determines purity of boron
The Feltman Research and Engineering Labo ratories at Picatinny Arsenal use emission spec troscopy to analyze amorphous and crystal line boron used in pyrotechnic compositions. The emission spectroscopy laboratory at Picatinny Arsenal is set up to analyze various materials of interest to the Ordnance Corps. Boron technology is of par ticular importance in respect to pyrotechnic research and development. It is vitally important to maintain excellent composition control of this material since impurities are reflected in pyrotechnic properties. At this laboratory, boron samples are converted to the oxide by means of nitric acid and hydrogen per
Ν A T ITRADEMARK O N A L
GRAPHITE
oxide (30% ). The oxide is mixed with graphite powder and loaded into high purity electrodes. These samples are arced for 60 seconds under AC arc excitation at 2400 volts — 4 amps. Results — spectra, recorded on SA1 emulsion plate, are correlated with additional data for studying properties of pyrotechnic compositions. Use NATIONAL Graphite products in your laboratory
Be sure to specify "National" Graphite for your spec troscopic work. This brand of electrodes and powders is accompanied by a "statement of purity" indicating the trace elements present. Analysts are forewarned against errors arising from unexpected spectral lines.
ELECTRODES
UNION CARBIDE
The terms "National" and "Union Carbide" are registered trade-marks of Union Carbide Corporation NATIONAL C A R B O N C O M P A N Y · Division of Union Carbide Corporation · 30 East 42nd Street, New York 17, Ν. Υ. Sales Offices: Atlanta, Chicago, Dallas, Kansas City, Los Angeles, New York, Pittsburgh, San Francisco. In Canada: Union Carbide Canada Limited, Toronto. For further information, circle number 97 A on Readers' Service Card, page 101 A VOL.
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