Patent ID: 7784367

Claim:
A gas resistance test method for an image sample, the method comprising: setting the image sample in a mixed gas atmosphere containing at least ozone and nitrogen dioxide in a test tank; and evaluating a gas resistance of the image sample under conditions (1) and (2): (1) ozone concentration in the mixed gas is not less than 75 ppb and not more than 300 ppb, nitrogen dioxide concentration in the mixed gas is not less than 150 ppb and not more than 3000 ppb, and a ratio of ozone to nitrogen dioxide in the mixed gas (ozone:nitrogen dioxide) is from 1:2 to 1:10; and (2) the mixed gas is continuously supplied to an image sample surface at a flow rate of not less than 0.2 m/s and not more than 3.0 m/s by means of a stifling fan provided in the test tank for stirring the mixed gas.