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The Properties of PYREX Radio Insulators are Permanent
The permanent insulating properties
of PYREX Radio Insulators originate in the molten glass, are
cast imperishably within the finished insulator, and preserved
without change by three characteristics--an originally hard,
super-smooth surface--a high stability against corrosive
influences-- and an indifference to temperature conditions.
The perfection of the surface of PYREX
Radio Insulators is one of the most important factors in
preserving their continuous efficiency. Except in heavy storms,
rain does not form a continuous film on the surface, and as
atmospheric dust particles find no pores or cracks for permanent
lodgment, a mild rainfall washes away anything which may have
settled on the insulator surface.
The surface of PYREX Radio Insulators,
furthermore, has no glaze to craze or check--no pores to pit.
The surface and the body are homogeneous and uniform in
At but three points below the diamond
in hardness, this surface remains unblemished and unscarred
even by wind-blown sand or ice.
The stability of PYREX Radio Insulators
against corrosive influences renders them immune to the attack
of acid fumes, smoke, fogs and salt sprays. For this last
reason, PYREX Insulators are widely used for marine communication
PYREX Radio Insulators, because of their
coefficient of expansion of .0000032 between 19°C. and
350°C., which is lower than that of any manufactured substance
with the exceptions of fused quartz and Invar steel, are
indifferent to heat shock and abrupt temperature changes.
Tropical sunshine does not create strains within them. The sudden
chill of a summer hail storm does not affect them.
PYREX Radio Insulators Have Proven Their Worth
Wherever radio communications is a vital
factor, PYREX Radio Insulators will be found playing their part
in improving the chance of sending and receiving important
Many adventurers and explorers have
included PYREX Radio insulating equipment as an essential
feature of their communication systems.
Commander McMillan relied on PYREX
Insulators when his ship and plane expedition explored the
A recent radio message from the
Bowdoin, once more visiting the Arctic, is reproduced
on the next page.
When Commander Byrd flew across the North
Pole the messages from his airplane transmitter traveled out
from an antenna equipped with PYREX Insulators.*
||(*See note opposite