Patent ID: 8129622

Claim:
A feedthrough assembly comprising: a element for conducting electrical current; a glass insulating member positioned around a portion of the element, the glass insulating member being in sealing engagement therewith, the glass insulating member comprising: about 30% B 2 O 3 ; about 30% to about 40% of a member selected from the group consisting of CaO, MgO, SrO, and combinations thereof, with the proviso that the individual amounts of CaO and MgO are each not greater than about 20%; about 5% La 2 O 3 ; about 10% SiO 2 ; and about 15% Al 2 O 3 , wherein all percentages are mole percentages; and one of: a sleeve member positioned around the insulating member, the sleeve member in sealing engagement with the insulating member, and a substrate having an aperture, the insulating member positioned within the aperture and in sealing engagement with the substrate.