Dr . Goodhue's earliest aerosol propellant idea came to mind when he worked in 1929-30 as a research chemist on lacquer formulations at the DuPont Chemical laboratories in Parlin, New Jersey.
12.
Carbon tetrachloride, now generally banned, was widely used as a solvent to clean metal and machinery, for dry cleaning and spot removers, in refrigeration, as an aerosol propellant and in pesticides.
13.
Compounds called chlorofluorocarbons, the stuff that used to be contained in most aerosol propellants and the refrigerants in refrigerators and home and automobile air conditioners, also eat away at the ozone layer.
14.
In addition to the adsorbents, oxidizers, surfactants, and disinfectants listed above, ingredients in air fresheners can include fragrances, aerosol propellants, preservatives, and solvents such as mineral oil or 2-butoxyethanol and other glycol ethers.
15.
In the 1970s and 1980s, the scientists discovered and explained the processes by which chlorofluorocarbons, chemicals widely used at the time as refrigerants, plastic foams and aerosol propellants, destroy the stratospheric ozone layer.
16.
Instead, the liquid phase of MAF sensor cleaners and electronics cleaners is typically based on hexanes or heptanes with little to no alcohol content and use either carbon dioxide or HFC-152a as aerosol propellants.
17.
Over the next few years, Johnson encouraged his scientists to develop the company s many non-CFC aerosol propellants and pulled his aerosol business out of several countries in which CFCs were mandated in aerosol production.
18.
Consequently John Joyce learned that a'harmless'part of NO x emissions, nitric oxide ( NO ), in the presence of hydrocarbons ( such as household aerosol propellants, possible gas leaks and ingress of vehicle exhaust fume ), converts to NO 2.
19.
The accolade is a vindication for the two Americans, who were attacked by industry when in 1974 they first advanced their thesis that the continued use of chlorofluorocarbons as refrigerants, plastic foams and aerosol propellants would seriously damage the ozone layer.
20.
However it is unlawful to use HCFC-22 as a propellant in the US, as it is a Class II ozone-depleting substance and its use as an aerosol propellant has been banned since January 1994 under section 610 ( d ) of Clean Air Act.
