The Composite Rupture Disc for a Unisert Holder has a flat seat configuration and consists of two or more metallic or non-metallic components. The components typically consist of a metallic top section and metallic or non-metallic seal, with an optional vacuum support, protective rings, gaskets or outlet liner. The Composite Rupture Disc top section is manufactured with a patented seven hole pattern, and with six pre-cut sections providing a non-fragmenting design when used with a non-metallic or Teflon® seal.