Abstract: A composite structure (10) is defined, consisting of components made of a zero-expansion material, in particular of a glass ceramic such as Zerodur®, which are joined together by at least one adhesive layer (17, 19, 26, 28, 30, 32). The composite structure (10) has the advantageous properties associated with zero-expansion materials, in particular a very low coefficient of thermal expansion, strength up to 150° C. and minimal outgassing.

Abstract: A quartz infra-red radiator comprises a housing (1) and has disposed therein at least one heating element (2), electrical connections (3), plug connections (4, 5) on the back of the housing and with a heat-resistant insulating holder (6) for the heating element. In order to produce such a plug-in quartz infra-red radiator more easily and at a more competitive price, the heat-resistant insulating holder (6) comprises a space (7) to hold at least a part of a plug-in connection (5) and at least an aperture through which it is possible to pass a part of a plug connection (5) which is housed in the space (7) and which protrudes from the housing (1).