This International Standard specifies a test method for passenger car (as defined in ISO 3833) rear-window demisting systems, when these are fitted.

It does not specify reference areas or levels of performance, since at the time it was prepared there was insufficient data available.

The test method is intended for types of power-driven vehicles which do not differ from one another with respect to the following essential features which affect demisting performance:

• shape, size and surface characteristics of the rear-window;
• characteristics of each system designated by the vehicle manufacturer as contributing to the demisting of the rear-window;
• number of seats as designated by the vehicle manufacturer.