The infrared-transmissive structure 20 includes a first infrared-transmissive element 22 and a second infrared-transmissive element 22, which transmit infrared rays in the 3.6-7 micrometer wavelength range, preferably coated with a zinc sulfide anti-reflective coating 26, A non-solventable infrared-transparent polymer layer (30) over the element (22) is included. The polymer is formed from an adhesion promoter such as a cured additive silicone such as a cured additive type dimethyl silicone and 3-glycidoxypropyl triethoxy silane. The polymer layer 30 may be a surface layer or may be used as an adhesive between the first infrared-transmissive element and the second infrared-transmissive element.
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