HAIXIANG METAL

4J29(Kovar),4J32,4J33,4J34,4J36(Invar),4J50 
Kovar is an iron-nickel-cobalt alloy with a coefficient of thermal expansion similar
to that of hard (borosilicate) glass. This makes it especially suitable for uses which
require a matched-expansion seal between metal and glass parts.
Thus kovar finds wide usage in the electronics industry for metal parts bonded to hard
glass envelopes for such devices as power tubes, x-ray tubes, etc, and other
applications requiring glass-to-metal seals. 

Specification

                  GB      SATM      UNS   

KOVAR    4J29     F15        K94610