solvents and diluents

207

Solvents, evaporation rate. The volatile part of a paint or varnish film is
necessary at the time of application and largely escapes or evaporates after the
film is spread. This escape is a movement of molecules through the surface and
100

Time   in   Hourly
figure i. Evaporation rate curves of fast to intermediate liquids, adapted from those
of A. K. Doolittle, 'Lacquer Solvents in Commercial Use,' Industrial and Engineering
Chemistry, XXVII (1935), p. 1171, fig. 3- According to number, these are as follows:

13. Amyl acetate (mixed isomers)
into the surrounding air where they mix with the gaseous components of the air
and become part of them. Escaping molecules exert a pressure called * vapor
pressure/ The rate of escape differs greatly in different liquids. To some extent.
 1.	Methyl acetate
 2.	Acetone
 3.	Benzene
 4.	Ethylene dichloride
 5.	Ethyl acetate
 6.	Methanol (anhydrous)

 7.	Methyl ethyl ketone
 8.	Ethanol (anhydrous)
 9.	Petroleum naphtha

 10.	Toluene
 11.	7?-Butyl acetate
 12.	Xylene