Irradiation area of test piece shall be 30 mm min in vertical direction and over 30mm min horizontal direction, and thickness shall be determined according to agreement to agreement between the parties concerned. Further, when test piece has urethane foam backing layer as part construction, density and composition, etc. of the layer shall be determined between the parties concerned.
5.2 Other
In case of test piece with texture direction, such as fabrics, etc., attachment direction relative to test apparatus shall be indicated.
6. PROCEDURE
6.1 Attach test piece on test piece holder firmly so that it won’t drop. Further, when backing material like urethane foam is attached on backside of test piece, the backside shall be contracted with backing material as tightly as possible so that it shall not become loose.
6.2Set test piece holders with test pieces attached on a rack or a rotary board without gaps between the holders. When there are some test piece holders without test pieces, put white-colored papers, aluminum plates, stainless steel plates, etc., on all of the holder in order to keep heat equilibrium inside test tank.
6.3 Select a certain irradiance within 48-100W/m2 in the wavelength of 300-400nm, and adjust test apparatus so that the selected irradiance shall be kept constant during exposure.
6.4 Adjust B.P.T during exposure within 89±3℃ by temperature adjusting apparatus.
6.5 Adjust humidity during exposure within 50±5% RH.
6.6 In case of broad samples, their position shall favorably be replaced at certain intervals for better test accuracy.
Remarks: Radiant exposure quantity can be calculated by the following formula:
Radiant exposure quantity (KJ/m2) = Irradiance (W/m2)×Time(Hr)×3.6