Circular 21 - Insecticides and Subsidiary Materials 
Chemically, asbestos is a soft and fi- 
brous silicate mineral which resists fire and 
most solvents. It is employed in the building 
industry for insulation or fireproofing in a 
great var^^ety of forms. 
Asbestos fibre can be purchased for 
from $15.00 to ^U2.50 per ton in carload lots. 
For manufacturers and distributors see 
numbers 13, 31, 34, 40, 48, 60, 62, and 74 of 
list at end of this circular. 
BENZSInTE 
This liquid is also called benzol, C^H^,, 
and is used to kill the larvae of the human 
botfly and screwv/orm infestin.r: the v/ounds of 
animals, i.e., cows, horses, and other live- 
stock. The benzene is applied preferably as a 
spray, after which the larvae are removed. 
Benzene is a clear, colorless, highly 
infl^imaiable liquid, lighter than water, and 
has a characteristic odor su^gestin^-; that of 
coal gas. In addition to medicinal uses, it 
is employed in the manufacture of medicinal 
chemicals, dyes, linoleum, oilcloth, varnishes, 
lacquers, and airplane dopes. It is a good 
solvent for waxes, resins, oils, and rubber. 
Benzene should not be confused with oenzine 
which is derived from petroleum oil. 
Caution : Since benzexne is highly in- 
flEimmable, it must be kept in well-closed 
containers in a cool place and av.'ay from fire. 
The vapor is poisonous. 
Benzene or benzol is obtainable in tank 
cars and drums, the price ranging from lU to 
19 cents per g::llon. 
