1.1 This specification covers chemically resistant, low expansion Type-I borosilicate glass, Class A, (see Specification E 438) used to manufacture beaded end flanged-glass pipe and fittings for pressure and vacuum applications. This specification covers chemically resistant, low expansion borosilicate glasses (Type I, Class A) used to manufacture beaded and end flanged-glass pipes and fittings for pressure and vacuum applications. Both the inside and outside surfaces of the g