The Tempest gaskets are fully compliant wlth all FAA test requirements. They are certified for use on all reciprocating engines that formerly used MS or AN type governor gaskets. In Tempest tradition, the design of the gaskets is an improvement over MS gaskets. They are successfully tested to withstand 1000 psi. A 20% increase over the MS test requirements. Factory applied DC4 lubricant to prevent gasket from stlcking to engine or governor. The specialized black coats on the stainless steel screen whlch Is "vulcanizd" between the outer layers of the Buna N rubber makes the gasket "monolithic" In construction. The rubber cures Into a solid block wlth the screen trapped Inslde it. This special process is designed to eliminate leaks that can occur with the laminated dle cut gaskets.