Patent ID: 8573194

Claim:
A heat reflecting arrangement that maintains a high reflectivity at thermal loads of 500° C. for more than 100 hours, said heat reflecting arrangement comprising a transparent glass or glass ceramic substrate; a heat reflecting layer (A) on at least one side of the substrate, said heat reflecting layer comprising at least 30% indium tin oxide (ITO) and having a thickness of 100 to 800 nm; and a barrier layer (B) that covers the heat reflecting layer (A), wherein said barrier layer (B) consists of at least one compound and said at least one compound is selected from the group consisting of SiO 2 , Si 3 N 4 , Al 2 O 3 , TiO 2 , SiO x N y , ZrO 2 , MoO 2 and Nb 2 O 5 ; wherein said barrier layer (B) has a thickness selected according a refractive index thereof, so that said heat reflecting layer (A) and said barrier layer (B) cooperate as reflector and interference system with a plasma edge from 1200 nm to 1600 nm, so that the arrangement is completely transparent in a visible range but reflects infrared radiation in an infrared range.