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1.1 This test method covers a procedure for determining the tendency of interior trim materials used in automobiles and other vehicles to produce a light-scattering film, which may be called fog film or fog, on a glass surface in a controlled environment.

1.2 Acceptance criteria for materials tested using this test method will be established by the specifications of those companies that implement this test method.

1.3 This procedure is applicable to the measurement of fog condensate on glass surfaces within the limits of the test conditions. This test will not measure or cannot measure accurately those cases in which:

1.3.1 The condensate's surface tension is low, resulting in early coalescing into a thin transparent film.

1.3.2 The condensate is present in such large quantity that the droplets coalesce and form a heavy oily/clear film on the glass surface. This heavy film would result in false glossmeter readings during the final evaluation.

1.3.3 The condensate is reactive within the vehicle environment or interactive with other volatiles in the vehicle not present in the test chamber.

1.4 All testing on compounds indicated herein is based on materials conditioned in a controlled atmosphere of 23 + 2°C and 50 + 5% relative humidity for 24 h prior to any testing and tested under the same controlled conditions.

Note 1-This standard and ISO 6452 are essentially equivalent.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See Note 4 for a specific hazard statement.