FED-STD-791D
NOTE 2: A high humidity insures against clogging the atomizers by salt deposition.
A satisfactory method of humidifying the air is to pass it in very fine bubbles through a
tower containing heated water. The temperature of the water should be 35C (95F) or
higher. The permissible temperature increases with increasing volume of air and with
decreasing heat insulation of the chamber and temperature of its surroundings. It should
not exceed a value above which an excess of moisture is introduced into the chamber (for
example, 43C [110F] at an air pressure of 82 gage kPa [12 psig]), or a value which
makes it impossible to meet the required operating temperature.
4.4 Air supply, compressed, free from impurities such as oil and dirt.
4.5 Reservoir (for salt solution).
5. MATERIALS
5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method
10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,
handling and storage precautions, emergency treatment and measures, and spill practices
of each chemical are explained.
5.2 Sodium chloride (A-A-59282).
5.3 Hydrochloric acid (A-A-59282).
5.4 Sodium hydroxide (A-A-59282).
5.5 Bromothymol blue, solution, indicator, 6.0 to 7.6 pH range [u,u,u].
5.6 Distilled water ACS.
5.7 1,1,1-Trichloroethane (ASTM D 4126).
5.8 Cleaning tissue, facial.
5.9 Three test panels made of low-carbon, open-hearth, cold-finished 1010 steel,
7.5
5.0 by 0.32 cm thick (3 2 by 1/8 in thick).
6. PROCEDURE
6.1 Preparation of salt solutions.
6.1.1 5% solution. Dissolve 5 0.5 parts by weight of sodium chloride in 95
0.5 parts by weight distilled water. Filter the solution if there is any suspended matter.
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