Susanne
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doc#121 soil to be removed, and the detergent or surface -active material. An oversimplified differentiation
doc#121 differentiation between soft- and hard- surface cleaning lies in the magnitude and kind
doc#121 cleaning lies in the magnitude and kind of surface involved. One gram of cotton has been found
doc#121 cotton has been found to have a specific surface area of <formul>. In contrast, a metal
doc#121 chemical reactivity. Spring used a Brush surface -analyzer in a metal-cleaning study and
doc#121 differences in soil removal, depending upon surface roughness. There are considerable differences
doc#121 between the requirements for textile and hard- surface cleaning. Exclusive of esthetic values,
doc#121 the dirty ones. As is the case with the surface -active agent, the requirements for builders
doc#121 in practice. </p><p> The problems of hard- surface cleaning are not nearly as complex. In
doc#121 cleaning are not nearly as complex. In hard- surface cleaning, the inorganic salts are more
doc#121 are employed, practically any wetting or surface -active agent will do a reasonably good
doc#121 present in sufficient amount in a hard- surface cleaning formulation. Hydroxides, orthophosphates
doc#121 important inorganic ingredients of hard- surface cleaners. In addition, the polyphosphates
doc#121 importance of the inorganic constituents in hard- surface cleaning has been emphasized in a number
doc#121 the soiled objects is mechanically held by surface irregularities to some extent. However,
doc#121 uncharged particles, or to stick to an uncharged surface . Obviously, if colloidal particles bear
doc#121 particle will tend to stick to an uncharged surface and vice versa, and a charged particle
doc#121 particle will be very strongly attracted to a surface exhibiting an opposite charge. In addition
doc#121 dirt particles can be held onto a soiled surface by sticky substances or by the surface
doc#121 soiled surface by sticky substances or by the surface tension of liquids, including liquid greases