About the Author

Montfort A. Johnsen
Montfort A. Johnsen
Articles by Montfort A. Johnsen
The extreme irritant effects of certain pepper vein extracts on human skin, eyes, tongues and nasal passages have been known for thousands of years, but only since about 1970 have these debilitating effects been used…
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“Bag-on-valve” (BOV) aerosol development has made possible a large number of sophisticated skin moisturizing products able to compete with the various non-pressurized versions. With the added elegance of shaped aluminum cans and easy-press spouts, they…
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This article originally appeared in the June 2005 issue of SPRAY. Because it is still relevant information we are offering it again to our readers. It has been reviewed by the author and independent sources…
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In 1952, the research manager of an aerosol filling company asked this writer if there were any liquefiable propellants less costly than chlorofluorocarbons (CFCs). Hydrocarbons, such as butanes, were mentioned, but soundly rejected due to…
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Our skin is the body’s largest organ and the only one exposed to all the vicissitudes of the environment. It must tolerate solar radiation, changes in temperature and relative humidity, oxidation (by oxygen, ozone and…
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Oxygen is ubiquitous. In molecular and combined forms, it constitutes about 50% of the earth’s crust. The oceans, lakes and rivers are 88.2% combined oxygen. Rocks and soil contain 46.2% and the troposphere holds 23.14%…
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Today, virtually every aerosol has some air in the dispenser. The amount varies with the fill volume, the degree of vacuum crimping (if any), the volatility of the content and other factors. It can be…
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The aerosol automotive products category got off to a rather slow start. The products were never mentioned in H.R. Shepherd’s book Aerosol Science & Technology (1961) and only briefly in M.A. Johnsen’s The Aerosol Handbook…
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  Over the years, a surprising number of volatile organic compounds (VOCs) have been used as aerosol propellants. Those that are liquids at room temperatures have ranged from n.pentane (-5 psi-g. at 70°F) to carbon…
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  The venerable hot water bath (or hot tank) dates all the way back to the beginning of the commercial aerosol industry in 1947. Harry Peterson and other pioneers contacted the Interstate Commerce Commission (ICC—a…
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The Board of Directors for the Aerosol Industry Association of Japan (AIAJ) met in April and announced production figures for 2011. According to AIAJ, the estimated number of units filled in 2011 (January to December) is 546,213,000, an increase…
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