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HIGH PRESSURE
The ability of a ceramic-to-metal seal to withstand either high external
or internal pressure is very dependent upon its design and construction.
Where ceramic and metal components are under compression forces, it
is acceptable to allow operation up to 350Kg/cm2. In a situation
where the reverse applies the maximum pressure allowable, for guidance
only, is 35Kg/cm2. In any application where high pressures
are involved please contact our technical staff for advice.
SIMULTANEOUS HIGH TEMPERATURE AND PRESSURE
At temperatures above 50°C the ability of the ceramic-to-metal seal
to withstand high pressure will be reduced. This particularly applies
in oxidising atmospheres where, at elevated temperatures, braze erosion
can occur. In all applications employing simultaneous high pressure
and high temperature it is advisable to consult our technical staff
for advice.
OPERATING TEMPERATURE
The excellent thermal shock property of alumina permits satisfactory
operation down to liquid nitrogen temperatures (-196°C).
At high temperature satisfactory continuous operation is dependent
upon the atmosphere which the ceramic-to-metal seal is subjected and
also the braze alloy employed in its construction. Recommended maximum
temperatures are shown on the next page:-
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