he irradiance adjusting apparatus is an apparatus to correct the attenuation of radiation energy accompanying the use of a xenon-arc lamp and filter, measuring the irradiance in the wavelength of 300 to 400 nm, and shall be provided with one of the following conditions:

1) It shall be capable of manual adjustment of the lamp power to make the irradiance constant.

2) It shall be capable of automatic control of the lamp power to make the irradiance constant.

3) It shall be capable of manual adjustment of the lamp power stepwise accoding to the time of use.

4.3Black Panel Thermometer

Black panel thermometer is so structured that the heat sensitive body, bimetal, platinum resistor, thermistor, thermoelectric couple, etc., is attached coincident with the center of the metal plate and is adhered tightly to the heat sensitive body protecting tube.

Remarks: Structures and dimensions shall be in accordance with 5.7(2) and Attached Fig.1. Type A of JIS B 7754.

4.4 Test Tank

Temperature and humidity in test tank shall be as follows:

1) B.P.T. at the position of test piece shall be 89±3℃.

Remarks: Temperature will be different depending on the combination of xenon-arc lamp type and filter.

2) Relative humidity

It shall favorably be capable of keeping relative humidity 50±5% under the temperature specified in 1). Further, relative humidity shall be measured at the point close to and inside the exit of test tank.

4.5 Other

Items unspecified in the foregoing clauses, such as test tank, xenon-arc starting and stabilizing apparatus, temperature adjusting apparatus, humidity adjusting apparatus, test piece holder, cooling apparatus, instrumentation apparatus, etc., shall be in accordance with JIB B 7754.

5. TEST PIECE

5.1Dimensions of Test Piece

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