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Fogging is the condensation of volatile substances from interior materials onto the inside of the windscreen and the windows. The result is a greasy film that scatters light, reduces visibility at night and is difficult to clean. Fogging testing quantifies how much condensable matter a material releases and how much haze it produces.
DIN 75201 defines two procedures: the gravimetric method, which weighs the condensate collected on a cooled glass plate, and the photometric method, which measures the haze of that plate. VDA 278 covers the FOG fraction obtained by thermal desorption, and is often run alongside the VOC fraction in the same analysis. Component-level tests use a heated chamber with a cooled window.
NTEK tests leather, textiles, plastic skins, foams, adhesives and coatings used in vehicle interiors, and supports material selection during development as well as incoming inspection in production.
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